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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 76

post #1126 of 8002

I appreciate all the effort that you have all put in to working out all these fantastic tubes. I love my ld mkiii and remain transfixed with all the tube possibilities.

I have just received my tek ge 8425 and to my ears these are great tubes. The instrument separation is impeccable and the cleanness across the frequencies is refreshing. It is like that thin veil that was there with the best of the ef 91 92 95 tubes has been lifted. It is hard to imagine the TS 6485 being truly a world above but I trust what others have said and I look forward to my pair making it across the ocean.

I still enjoy the tubes from the other families but now it is like matching wine with your meal instead of one wine for everything. Am I the only one who does this, has the drive to discover the ultimate do it all tube relinquished all your previously loved tubes to the dust bin?

I would love to upgrade my power tubes to the 6h30 family and to that end I will insert a shameless plug to my ad where I am selling my surplus tubes to fund a supertube purchase/trade.  Look here http://www.head-fi.org/t/659457/little-dot-tubes-ef95-ef92-ef91.

Gary


Edited by mojorisin35 - 4/25/13 at 9:50am
post #1127 of 8002
A couple new tubes arrived in the mail today:
 
Below are a pair of Sylvania 6AQ6 which combines two diodes with a high-mu triode voltage amplifier. They have 150mA heaters, like the 6AK5, but an amplification factor of 70! Also notice that they have side-getters and the tops of the tubes are clear.  As with the 6J4, we need to cut off pins 5 and 6 and set our LD in the EF92 mode to use these tubes.
 
These particular tubes are fairly old as they have green writing and came in green Sylvania boxes, maybe 1950s?
 

 

Next, a pair of Sylvania 6AV6, another two diode/high-mu triode voltage amplifier. These are essentially the same as the 6AQ6 except thay have 300mA heaters and an amplification factor of 100!!!  And again, we will need to cut off pins 5 and 6 and set our LD in the EF92 mode.
 

 

Later today, I will cut pins and begin burning...
 
But now I want to revisit the Tung Sol 6485...
 
I have been a bit bothered by the fact that my experience with the TS 6485 has been so much different than that of A11 and AFB. For the most part I have substantially agreed with their impressions of all the new tubes we have been trying, and it just didn't make any sense to me that my TS 6485 sounded nothing like what they have been describing.... 
 
Last night, on a whim, I installed my 1961 Tung Sol JAN-6AH6. I didn't remember being negatively impressed while burning them in a month ago, and thought it might be interesting to listen to them again. I was shocked! I had forgotten how good these sounded! Moreover, they are nothing like my TS 6485?! 
 
For some reason my TS 6485 do not sound like my older JAN-6AH6. And apparently, my TS 6485 do not sound like those of A11 and AFB. But this presents another mystery. Are my mid-60s TS 6485 with square getters an aberration?
 
Anyway, I am quite sure my JAN-6AH6 sound like Mordy's JTL-6AH6WA. And I am quite sure they sound like A11's and AFB's TS 6485. However, in order to test this further, I have ordered a second pair of TS 6485, but newer, with round halo getters. But for now, I am quite certain we have consensus that these Tung Sols are in the top tier of the best of the best we have tried. 
 
In my mind the Sylvania 6J4/8532W are also in the top tier, but they are somewhat different than the TS 6485. I think it comes down to a matter of taste. Per AFB, the 6J4 are "musical, mellow and a little bassy" while the TS 6485 are "ultra-detailed and balanced -read occasionally treble-oriented- with a great stage." And perhaps one might say, more "analytical". Anyway, I feel that they are equally good, but different.
 
However, it appears that I am the only one who has listened to the Sylvania 6J4/8532W to date.  AFB should be getting his soon, and after a few more people report their impressions, we will know if these Sylvanias are also a consensus top tier tube.
 
At this point in time, I wholeheartedly recommend the TS 6485 as long as you get the round halo getters. And I also recommend the older mil-spec TS JAN and JTL tubes. These Tung Sols are really, really good. :)
 
Edited to fix typing error: Should be 6485 and not 8564.

Edited by gibosi - 4/25/13 at 11:47am
post #1128 of 8002
Quote:
Originally Posted by gibosi View Post

A couple new tubes arrived in the mail today:
 
Below are a pair of Sylvania 6AQ6 which combines two diodes with a high-mu triode voltage amplifier. They have 150mA heaters, like the 6AK5, but an amplification factor of 70! Also notice that they have side-getters and the tops of the tubes are clear.  As with the 6J4, we need to cut off pins 5 and 6 and set our LD in the EF92 mode to use these tubes.
 
...
 
Next, a pair of Sylvania 6AV6, another two diode/high-mu triode voltage amplifier. These are essentially the same as the 6AQ6 except thay have 300mA heaters and an amplification factor of 100!!!  And again, we will need to cut off pins 5 and 6 and set our LD in the EF92 mode.

 

Gibosi, sounds exciting, we are curious =)

 

Quote:
Anyway, I am quite sure my JAN-6AH6 sound like Mordy's JTL-6AH6WA. And I am quite sure they sound like A11's and AFB's TS 8465. However, in order to test this further, I have ordered a second pair of TS 8564, but newer, with round halo getters. But for now, I am quite certain we have consensus that these Tung Sols are in the top tier of the best of the best we have tried.

 

Do you mean TS 6485?
 

 

Quote:
Originally Posted by duncan1 View Post

Look on the heaters as 2 resistors connected together at the center tap the  current flow through both will be the same 2 equal resistances connected in parallel the total resistance is HALVED[more current used] if connected to the other heater connection at the center  tap.    Applying  12V across -4+5 without using the CT will reduce the amount of current through them for use in other equal current heater circuits.by INCREASING the total resistance[lower resistance=higher current].[higher resistance=lower current]

                    So "double connect"-IE- shorted together 4+5 and the other heater connection to 9-AFTER you have removed the earth connection to it.

 

Duncan1, Thanks for making this clear. I shall now check my sources for a curious roll, at least one ;)

 

post #1129 of 8002
Quote:
Originally Posted by gibosi View Post

A couple new tubes arrived in the mail today:
 
Below are a pair of Sylvania 6AQ6 which combines two diodes with a high-mu triode voltage amplifier. They have 150mA heaters, like the 6AK5, but an amplification factor of 70! Also notice that they have side-getters and the tops of the tubes are clear.  As with the 6J4, we need to cut off pins 5 and 6 and set our LD in the EF92 mode to use these tubes.
 
These particular tubes are fairly old as they have green writing and came in green Sylvania boxes, maybe 1950s?
 

 

Next, a pair of Sylvania 6AV6, another two diode/high-mu triode voltage amplifier. These are essentially the same as the 6AQ6 except thay have 300mA heaters and an amplification factor of 100!!!  And again, we will need to cut off pins 5 and 6 and set our LD in the EF92 mode.
 

 

Later today, I will cut pins and begin burning...
 
But now I want to revisit the Tung Sol 6485...
 
I have been a bit bothered by the fact that my experience with the TS 8465s has been so much different than that of A11 and AFB. For the most part I have substantially agreed with their impressions of all the new tubes we have been trying, and it just didn't make any sense to me that my TS 8465 sounded nothing like what they have been describing.... 
 
Last night, on a whim, I installed my 1961 Tung Sol JAN-6AH6. I didn't remember being negatively impressed while burning them in a month ago, and thought it might be interesting to listen to them again. I was shocked! I had forgotten how good these sounded! Moreover, they are nothing like my TS 8465?! 
 
For some reason my TS 8465 do not sound like my older JAN-6AH6. And apparently, my TS 8465 do not sound like those of A11 and AFB. But this presents another mystery. Are my mid-60s TS 8465 with square getters an aberration?
 
Anyway, I am quite sure my JAN-6AH6 sound like Mordy's JTL-6AH6WA. And I am quite sure they sound like A11's and AFB's TS 8465. However, in order to test this further, I have ordered a second pair of TS 8564, but newer, with round halo getters. But for now, I am quite certain we have consensus that these Tung Sols are in the top tier of the best of the best we have tried. 
 
In my mind the Sylvania 6J4/8532W are also in the top tier, but they are somewhat different than the TS 8564. I think it comes down to a matter of taste. Per AFB, the 6J4 are "musical, mellow and a little bassy" while the TS 8564 are "ultra-detailed and balanced -read occasionally treble-oriented- with a great stage." Perhaps one might say, more "analytical". Anyway, I feel that they are equally good, but different.
 
However, it appears that I am the only one who has listened to the Sylvania 6J4/8532W to date.  AFB should be getting his soon, and after a few more people report their impressions, we will know if these Sylvanias are also a consensus top tier tube.
 
At this point in time, I wholeheartedly recommend the TS 8564 as long as you get the round halo getters. And I also recommend the older mil-spec TS JAN and JTL tubes. These Tung Sols are really, really good. :)

 

I really would not be surprised if there were a difference between older -D-getter- and later -O-getter- Tung Sol 6485 (yes, I'm sure Gibosi meant 6485 all along lol). My TS 6485 from 1970-1972 really do sound glorious. And to answer mojorisin (you must have been impressed by the 8425A, since you're selling your stock of EF95/2/1 right?), yes the whole 6485 (not necessarily the whole 6AH6 family, if you read my reviews the Raytheon and Sylvania JAN 6AH6WA back 5-10 pages ago) family is a whole grade above the 8425A, especially the Tung Sol 6485.

 

In my experience, both with US and UK tubes, the latest construction tubes (final internals and O-getter, though not from the last production years) sounded better than their earlier counterparts. This has been the case especially with UK EF91 types and US 6485 (early GE 6485 with D-getters do not sound like the later O-getter dark glass versions, not at all in fact) and also for US 6AK5 types.

 

Sadly, I STILL have not received my 8532W tubes, so I cannot compare them to the TS 6485...

 

Edit: Gibosi, what odd looking tubes, these 6AQ6 and 6AV6 are; side getters are pretty unusual and point to fairly old production tubes. It's funny how non-top-getter-flash tubes look so weird compared to the near universal top-getter-flash versions -save for power triodes which often have side or bottom getters and look great.

 

Shameless Edit: still selling a pair of 6N30P-DR, which I still highly recommend to take your amp to another level and your music to a different world (especially paired with our current top-tier tube choices!).

http://www.head-fi.org/t/654419/supertubes-matched-nos-6n30p-dr-electro-harmonix-6h30pi-gold


Edited by Audiofanboy - 4/25/13 at 11:53am
post #1130 of 8002
Quote:
Originally Posted by Acapella11 View Post

Do you mean TS 6485?

 

 

Yes.... Sometimes when I am typing these tube names with four numbers, they get all jumbled up...  (>_<)  lol Anyway, went back and fixed my typos.

 

And wouldn't you know? In this afternoon's mail, my second set of TS 6485 arrived. Unlike my older set, these are not at all transparent and they have military style date codes. Dated 1967 with halo getters and most importantly, even though they have been in my LD for only about 30 minutes, they sound like my 1961 TS JAN-6AH6, and not at all like my older TS 6485 with square getters.

 

Life is good! :)

 


Edited by gibosi - 4/25/13 at 11:54am
post #1131 of 8002

AFB “And to answer mojorisin (you must have been impressed by the 8425A, since you're selling your stock of EF95/2/1 right?), yes the whole 6485 (not necessarily the whole 6AH6 family, if you read my reviews the Raytheon and Sylvania JAN 6AH6WA back 5-10 pages ago) family is a whole grade above the 8425A, especially the Tung Sol 6485.”

 

True I am impressed with the 8425A however just to be clear I am selling my backups not my collection.

I have read every page of this thread and cannot believe the expertise within this thread. Everybody is friendly and helpful; there are very few threads on the internet in my experience where people’s opinions and ideas are respected without any flaming. Well done!

I can't wait to see where this thread continues to grow.

Gary

post #1132 of 8002

Decided to do a shootout between the Tung Sol JTL 6AH6WA  smoked glass tubes (hereafter referred to as TS 6AH6) and the Westinghouse Tektronix matched 6AU6A/4825A (hereafter referred to as the W4825) tubes.

 

The most striking thing with the TS 6AH6 tubes is the utter clarity and effortless reproduction of all frequencies with pinpoint imaging and a wide sound stage. Micro details, such as a musician saying something to another player or tapping his foot or the fingers making a sound when sliding over guitar strings come through clearer than any other tube I tried, and, as said before, you hear details in the music that you did not hear before. The bass has good slam and attack, and as mentioned, the tube is very balanced and neutral and simply beautiful to listen to. Usually I listen to speakers, but I tried them with my Audio Technica ATH-AD700 headphones. This turned out to be a great match. These headphones are said to be a little bass shy, but I did not notice it with the TS 6AH6 tubes.

 

My other favorite was/is the W4825 tubes. These are warmer and less analytical but ultimately lack some of the utter clarity of the TS 6AH6 tubes. They have a little more slam and attack when playing percussion and are more bright in my system. The bass is more round and full than the TS 6AH6 tubes. The sound stage is slightly larger, and strangely enough they seem to have more power when playing very loud compared to the TS 6AH6s. (I don't think this applies to people who listen through headphones.) Very sweet tubes which I could happily live with.

 

In summary, if I did not try the TS 6AH6 I would have been perfectly happy with the W4825 tubes. But if good is good, better is better, so the nod goes to the glorious TS 6AH6 tubes.

 

Until the next great discovery comes along......
 

post #1133 of 8002
Quote:
Originally Posted by mordy View Post

Decided to do a shootout between the Tung Sol JTL 6AH6WA  smoked glass tubes (hereafter referred to as TS 6AH6) and the Westinghouse Tektronix matched 6AU6A/4825A (hereafter referred to as the W4825) tubes.

 

The most striking thing with the TS 6AH6 tubes is the utter clarity and effortless reproduction of all frequencies with pinpoint imaging and a wide sound stage. Micro details, such as a musician saying something to another player or tapping his foot or the fingers making a sound when sliding over guitar strings come through clearer than any other tube I tried, and, as said before, you hear details in the music that you did not hear before. The bass has good slam and attack, and as mentioned, the tube is very balanced and neutral and simply beautiful to listen to. Usually I listen to speakers, but I tried them with my Audio Technica ATH-AD700 headphones. This turned out to be a great match. These headphones are said to be a little bass shy, but I did not notice it with the TS 6AH6 tubes.

 

My other favorite was/is the W4825 tubes. These are warmer and less analytical but ultimately lack some of the utter clarity of the TS 6AH6 tubes. They have a little more slam and attack when playing percussion and are more bright in my system. The bass is more round and full than the TS 6AH6 tubes. The sound stage is slightly larger, and strangely enough they seem to have more power when playing very loud compared to the TS 6AH6s. (I don't think this applies to people who listen through headphones.) Very sweet tubes which I could happily live with.

 

In summary, if I did not try the TS 6AH6 I would have been perfectly happy with the W4825 tubes. But if good is good, better is better, so the nod goes to the glorious TS 6AH6 tubes.

 

Until the next great discovery comes along......
 

 

I just spent another evening with my TS 6485, these still take me by surprise with the way things inside the music leap at me through my headphones.

 

Surely you speak of 8425A tubes right mordy, lol? But yes, those are exactly like my impressions of the step/grade between the best 6AU6A/8425A and the best 6AH6/6485 tubes. The -for instance GE- 8425A were beautiful to behold, musical and detailed, a revelation in and of themselves, but the first GE 6485 tubes I got showed just how much of that ultra-realistic detail I could get out my amp, and the TS 6485 took that a full grade further. Adjectives like balanced, pinpoint imaging, and super detailed are my exact thoughts to which I would just add -and that is what makes the whole difference- realistic. Only a few tubes I've had sound truly realistic and manage to really throw me -temporarily- into a beautiful world of music, or basically inside the studio and artists/audio engineers' mind: the TS 6485, the GE 6485 (both later O-getter versions, GE is less realistic but still a revelation), and to a lesser extent and easier on the ear, the Mullard EF94. That effect, while easier to get on speakers, is pretty impressive and actually quite mind blowing on good headphones. It reminds me just why I blow so much cash on audio gear lol, when I can't stop the toe-tapping effect and just listen to a few hours of music instead of testing my new tubes, I know I've hit a goldmine.

 

Now, you've all got me interested in a direct comparison between:

- Old world TS 6485 with D-getter

- Latest TS 6485 with O-getter

- TS JTL 6AH6WA with D-getter

- TS JTL 6AH6 with O-getter (which have a different "nub" than my 70s 6485 btw gibosi)

 

Just so we're able to know which is similar to which, and which production to buy.

post #1134 of 8002

One thing that I find astonishing is that there is such a great sense of consensus of our findings, even though we use totally different equipment and listen to very different types of music. In addition, we are located in different parts of the world. (The common denominator, of course, is the LD amps.)

 

One reason is that we all report our findings honestly and allow room for different opinions. To me, it is amazing that I can trust the opinions of the people on this blog to the extent that I will not hesitate to buy tubes based on the recommendations here. And due to the efforts and research of the members new vistas seem to open up all the time - curious to see which tube will end up on the top when the tube alphabet has been exhausted....

 

Happy tube rolling!
 

post #1135 of 8002

Now, I would like to take the opportunity to introduce a new family of LD tubes to you: The Heptode for Pentagrid Conversion Applications (6BE6 / 6BE6N) =)

 

Here it is, photographed as Sylvania JAN 5750, packed in September 1975:

 

 

It works in Pin 2/7-strapped wire mod or EF91/92 operation (I wouldn't say EF95, would I ;) ).

 

Because this is a new kid on the block, here are useful technical details:

 

 

These have only four hours on the meter, so first impressions only: So far, I am tempted to put them on GE 6AU6A level. Not quite TS 6485. In comparison to GE 6AU6A: the sound is opener, more spacious, somewhat wetter for more spatial information (echoes, reverb etc), holographic impression is not a precise as with the 6AU6A, and they are ever so slightly not as smooth, but tubier than the TS 6485. I do really love the stage. They sound somewhat clear as in the no part of the frequency spectrum attempts to overwrite the other. The signature is well balanced. Treble is nicely extended, not harsh, not too mellow, bass has a good weight, reasonably tight, as in better than 6EW6, not as hard as TS 6485 but a bit more weight than these. Because it is mellower than the TS 6485, it lacks little of this dead neutral CV4015-like precision and also the pin-pointing is not a accurate as with the 6AU6A. However, overall, I would say the grade could be similar to the GE 6AU6A at the moment. Maybe too much text for a first impression, lol.

Let's see how and whether the tube develops during the burn in process.

 

Quote:
Originally Posted by mordy View Post

One thing that I find astonishing is that there is such a great sense of consensus of our findings, even though we use totally different equipment and listen to very different types of music. In addition, we are located in different parts of the world. (The common denominator, of course, is the LD amps.)

 

One reason is that we all report our findings honestly and allow room for different opinions. To me, it is amazing that I can trust the opinions of the people on this blog to the extent that I will not hesitate to buy tubes based on the recommendations here. And due to the efforts and research of the members new vistas seem to open up all the time - curious to see which tube will end up on the top when the tube alphabet has been exhausted....

 

Happy tube rolling!
 

 

I am amazed about that, too. Great work indeed.


Edited by Acapella11 - 4/26/13 at 1:51pm
post #1136 of 8002

Yes, it is really is pleasant to know that you can trust people's opinions here and happily make your tube shopping list based on the consensus of -always polite and respectful- opinions. That kind of pleasantness, that allows for broader opinions and creativity, doesn't just happen magically though, it's obviously because of everyone effort to keep things productive and nice (besides, a troll would be quickly disarmed by the lack of response he'd get here lol, and probably go back to more feisty thread to troll). Many similar threads are much less amusing to browse through lol...

 

Great, heptodes! I'd had a few written down in my notes for a while, just waiting for investigation, and I believe that Alain person (the guy who had mysteriously tried many new tubes types by himself a year ago, and never gotten ant responses) had tried one or two of them. Funny thing is that at the socket level, all those extra grids are pre-strapped together, so it makes no functional difference compared to a pentode. There are a few more compatible ones out there though, I'll look through what I'd written down.

 

At any rate, so 6AU6 level apparently? That would already put these at the top or second top tier, which is pretty amazing for random tubes (I don't think we've bumped in to a bad or really mediocre tube for a while now, so we must be doing something right). Look forward to your review after 15-20 burn-in! Btw, any other common brands for these (GE, TS...)?

 

Edit: There other 7-pin heptodes: 6CS6 and 6BY6. All three tubes families have a ton of special types too, it's always worth getting those.


Edited by Audiofanboy - 4/26/13 at 1:13am
post #1137 of 8002

Btw, any other common brands for these (GE, TS...)?

 

Looked through the 6BE6/5750 offerings on EBay - there are plenty of them. (Can anybody explain why there are so many sellers that only offer a single tube? And when I ask the seller a question, nine times out of ten, they don't have a pair.)

 

All the major brands are represented as well some European equivalents. IMHO, based on my 6AK5 odyssey, I would always try to include Tung Sol tubes.

post #1138 of 8002
Quote:
Originally Posted by Audiofanboy View PostAt any rate, so 6AU6 level apparently? That would already put these at the top or second top tier, which is pretty amazing for random tubes (I don't think we've bumped in to a bad or really mediocre tube for a while now, so we must be doing something right). Look forward to your review after 15-20 burn-in! Btw, any other common brands for these (GE, TS...)?

 

Edit: There other 7-pin heptodes: 6CS6 and 6BY6. All three tubes families have a ton of special types too, it's always worth getting those.

 

Audiofanboy, On ebay, the largest variation and number of offers is available for 6BE6 tubes, between 6BE6, 6CS6 and 6BY6. Matched pairs etc... There are loads of options as Mordy already pointed out. I will keep you posted, ordered a pair of TS tubes, too.

 

Quote:
Originally Posted by mordy View Post

Btw, any other common brands for these (GE, TS...)?

 

Looked through the 6BE6/5750 offerings on EBay - there are plenty of them. (Can anybody explain why there are so many sellers that only offer a single tube? And when I ask the seller a question, nine times out of ten, they don't have a pair.)

 

All the major brands are represented as well some European equivalents. IMHO, based on my 6AK5 odyssey, I would always try to include Tung Sol tubes.

 

Thanks Mordy, TS sounds good to me too. Let's check this family out a bit.

 

 

6BE6 and sound sensitivity to jumper settings:

 

This is now still quite preliminary, but here it comes ;): There is a sound difference between jumper settings. If my first impressions are true, EF91/92 would sound more open, with more "zing" in the treble, less tubey, and more revealing, compared to 2/7-socket strap or EF95 float. On the other hand you lose some bass weight. It is like two tubes for the price of one ;). For me the EF91/92 setting cleans up the sound a bit and makes it more interesting. I might need to edit this statement later. Interestingly, on the tube side of things, the anode strapped grids 2 and 4 would then be  "in-line" with the anode strapped grid 3.


Edited by Acapella11 - 4/26/13 at 4:10pm
post #1139 of 8002
Quote:
Originally Posted by Acapella11 View Post

6BE6 and sound sensitivity to jumper settings:

 

This is now still quite preliminary, but here it comes ;): There is a sound difference between jumper settings. If I my first impressions are true, EF91/92 would sound more open, with more "zing" in the treble, less tubey, and more revealing, compared to 2/7-socket strap or EF95 float. On the other hand you lose some bass weight. It is like two tubes for the price of one ;). For me the EF91/92 setting cleans up the sound a bit and makes it more interesting. I might need to edit this statement later. Interestingly on the tube side of things, the anode strapped grids 2 and 4 would then be  "in-line" with the anode strapped grid 3.

 

With the tubes that we can run in either the EF91/92 setting or the socket-strapped EF95 setting, it seemed to me that there could very likely be some differences depending on whether these extra grids are strapped to the cathode or the anode. Five stars to you for checking this out! :)

 

And I have ordered a pair from each of the 7-pin heptode families:
 
GE JG-5750 6BE6W
Tung Sol 6CS6 Eh90
RCA JRC-5915
 
Re: 6AQ6/6AT6/6AV6, I started with the 6AV6 and am pleased to report no fireworks or explosions!  First impressions, the bass was a bit tubby and flabby, and the mids and highs seemed a bit congested. However, with about 20 hours on them the bass has tightened up and the midrange and highs seem to have opened up as well. These are now very musical, warm with a well-rounded bass, quite nice I think. I hope to find time this evening to closely compare the EF92, 6J4 and the 6AV6. Also, the 6AT6 arrived today and my plan is to take pictures and post them tomorrow.
post #1140 of 8002
Quote:
Originally Posted by gibosi View Post

 

With the tubes that we can run in either the EF91/92 setting or the socket-strapped EF95 setting, it seemed to me that there could very likely be some differences depending on whether these extra grids are strapped to the cathode or the anode. Five stars to you for checking this out! :)

 

And I have ordered a pair from each of the 7-pin heptode families:
 
GE JG-5750 6BE6W
Tung Sol 6CS6 Eh90
RCA JRC-5915
 
Re: 6AQ6/6AT6/6AV6, I started with the 6AV6 and am pleased to report no fireworks or explosions!  First impressions, the bass was a bit tubby and flabby, and the mids and highs seemed a bit congested. However, with about 20 hours on them the bass has tightened up and the midrange and highs seem to have opened up as well. These are now very musical, warm with a well-rounded bass, quite nice I think. I hope to find time this evening to closely compare the EF92, 6J4 and the 6AV6. Also, the 6AT6 arrived today and my plan is to take pictures and post them tomorrow.

 

Thanks Gibosi, the differences are quite noticeable but not huge. :) Cool, more 6BE6 fun then, looking forward to your impressions. You should also have tube fun this weekend with 6AQ6/6AT6/6AV6 tubes. Enjoy.

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