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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 226

post #3376 of 7215
Quote:
Originally Posted by Acapella11 View Post
 

 

The Raytheon 6BE6W I have are not as exciting / hard sounding, more gentle and "english" but one of their traits is that they are very holographic and large staged, which is not surpassed by the Valvos. In some ways they sound high end, in some systems they may not have the right environment to show it. They may only sound "boring / dark" in a non-matching system. This is why they match well with 6H30P tubes, which are reasonably bright and it opens them up in terms of stage. The refined treble warrants fatigue free listening and the bass is of good quality and quantity.

This could be a great example different amp implementation changing the final output of tubes. I have the MK1+ so I'm missing a pair of tubes because of my amps use of an opamp. I personally didn't care for the 6BE6W in my setup. The other difference would be my personal tastes. I tend to like lush mids with sparkly highs and punch tight bass. Another variable would be the cans we use. I have some variety BUT between my HD800, PS500 and AD2000x they all have a mid bass emphasis and fairly forward mids with accented treble (well minus the PS500)

post #3377 of 7215
Quote:
Originally Posted by kvtaco17 View Post
 

Received some Sylvania 6HA5 US made tubes today. They are burning in now. The GE6AV6's seem to have settled I'm going to give them another 10hours of use before I write impressions to be sure. Probably some time this week I'll write these up and compare them with the 6DT6 family.

 

I am looking forward to your impressions regarding the Sylvania 6HA5. As I already have some RCA/Siemens, GE/Blackburn and GE/??? 6AH5, I decided to wait for others to try the Sylvanias.... Thanks! :)

 

Besides, I have become so enamored with a pair of 1960 Amperex Bugleboy ECC88, that I am actively searching for other varieties. The 6DJ8 / ECC88 marketplace is very different than that of most of the non-traditional tubes we have been trying recently. For one thing, NOS/NIB tubes are often prohibitively expensive, so it is primarily a marketplace of used tubes. Even so, I have had to readjust my maximum price from $8/tube to $15/tube. Further, since these tubes are used, the vendor's measured test results are quite important. Tubes that test low have likely had a lot of use and thus can often be had rather cheaply. However a well-used tube may not last long, so I try to find tubes with test results that are close to new. Given this, so far I haven't even considered purchasing tubes that haven't been tested. After careful and patient searching, I have managed to stay below my limit and purchase some Mullard, Siemens, Tesla and Reflector tubes. Now all I have to do is wait....

 

And hey! It feels pretty lonely here in 6DJ8 land! I think AFB has has gone even further afield into 12A?7 land? Am I really the only one here?? lol :)

post #3378 of 7215

Hi Gibosi,

 

Could you describe the difference in sound between 6DJ8/ECC88 tubes compared to any (or all) of the best tubes from the 6AV6, 6AU6, 6AH6 or 6TD6 families?

 

If there is a substantial improvement in sound I may consider taking the plunge and learn how to connect and solder all the wires, buying the tools, adapters and tubes etc.

post #3379 of 7215
Quote:
Originally Posted by gibosi View Post

And hey! It feels pretty lonely here in 6DJ8 land! I think AFB has has gone even further afield into 12A?7 land? Am I really the only one here?? lol :)

Sorry good sir, those tubes are a little too rich for my blood.

I can enjoy rolling 6DJ8's vicariously through you. :D

:beerchug:

post #3380 of 7215
Quote:
Originally Posted by gibosi View Post
 

 

I am looking forward to your impressions regarding the Sylvania 6HA5. As I already have some RCA/Siemens, GE/Blackburn and GE/??? 6AH5, I decided to wait for others to try the Sylvanias.... Thanks! :)

 

Besides, I have become so enamored with a pair of 1960 Amperex Bugleboy ECC88, that I am actively searching for other varieties. The 6DJ8 / ECC88 marketplace is very different than that of most of the non-traditional tubes we have been trying recently. For one thing, NOS/NIB tubes are often prohibitively expensive, so it is primarily a marketplace of used tubes. Even so, I have had to readjust my maximum price from $8/tube to $15/tube. Further, since these tubes are used, the vendor's measured test results are quite important. Tubes that test low have likely had a lot of use and thus can often be had rather cheaply. However a well-used tube may not last long, so I try to find tubes with test results that are close to new. Given this, so far I haven't even considered purchasing tubes that haven't been tested. After careful and patient searching, I have managed to stay below my limit and purchase some Mullard, Siemens, Tesla and Reflector tubes. Now all I have to do is wait....

 

And hey! It feels pretty lonely here in 6DJ8 land! I think AFB has has gone even further afield into 12A?7 land? Am I really the only one here?? lol :)

 

Haha, no I'm still here and investigating double triodes in the shadows lol!

 

Like you said, since the prices and the selling "pattern" of these tubes are quite different from what we're used to, it takes a leap of faith to actually buy anything. So, I've been taking my time with these tubes.

 

While you've been a self-proclaimed "bottom feeder" of 6DJ8/ECC88 tubes, I've been trying to be a "middle feeder" of sorts, finding NOS or used but strong tubes from secondary manufacturers (EI, Matsushiita...) that used machinery from the best companies. Both for ECC88 tubes and 12AT7/ECC81, and even 12AX7/ECC83 (just as ridiculously expensive as some ECC88...).

 

Apart from my free pair of Mullard Mitcham M8162/CV4024 (12AT7), I have a few pairs of NOS EI ECC88 made on Philips machinery, with the later "A-frame" getter, which cost me nowhere near a premium price :wink_face:; and I just managed to find a pair (hopefully identical, but still perfectly useful otherwise) of used and very strong EI ECC83 (12AX7) with the legendary "long smooth plates" made on Telefunken machinery! Still, like you said, even though I keep thinking I got a good deal for them, I still forked 24.50€ -shipped- for the pair... I guess, since they're double tubes, one could argue that I'm just at the 6€ or $8/triode limit lol!

 

The latter is the good example of a pretty good deal you can get on ebay, without even looking that hard. These EI ECC83 had poor ad wording and no more silk screening on the tubes (no writings on tube apart from factory codes), so it took some googling to make sure what these were, and some eye squinting to read the factory codes; and as it is, I could only read the codes off of one tube. But sure enough, I saw the EI Nish factory, Yugoslavia, codes, and know for a fact that the tubes have those unmistakable Telefunken smooth long plates. So, it should turn out to be a good deal.

post #3381 of 7215
Quote:
Originally Posted by mordy View Post
 

Hi Gibosi,

 

Could you describe the difference in sound between 6DJ8/ECC88 tubes compared to any (or all) of the best tubes from the 6AV6, 6AU6, 6AH6 or 6TD6 families?

 

If there is a substantial improvement in sound I may consider taking the plunge and learn how to connect and solder all the wires, buying the tools, adapters and tubes etc.

 

In short, my LD with a pair of 1960 Amperex sounds better than it ever has. :)

 

The lows have good weight with superb detail and articulation. The mids are slightly warm and very clean, and the highs are crystal clear. Overall, they are very smooth, liquid, and musical. Details and sound stage are also exceptional. Against a black black background, the clarity and transparency is often breathtaking: Whispered lyrics, cymbal decay, details, details, details.... And the sound stage is wide and deep, with a real sense of space. You can hear the sound reverberating around the room, and instrument placement and separation is sharply etched and holographic. Again, my LD has never sounded this good....  I really like these tubes..... :)

post #3382 of 7215

700

Got some different tubes today. 6AQ4 seems to have weird connection and is perhaps totally out of calculations. Other 6CS6 is with broken glass. Others seem to be with no visible problems. Westinghouse JAN CK 6AG5 -45 were so difficult to get out of box, that i put them in test. Got 6N6P-IR tubes yesterday as new powertubes. Russian seller was so nice that put 1 spare -IR tube in package.

 

This is going to take long long... long time to manage all these.

post #3383 of 7215
Quote:
Originally Posted by Artsi View Post
 

700

Got some different tubes today. 6AQ4 seems to have weird connection and is perhaps totally out of calculations. Other 6CS6 is with broken glass. Others seem to be with no visible problems. Westinghouse JAN CK 6AG5 -45 were so difficult to get out of box, that i put them in test. Got 6N6P-IR tubes yesterday as new powertubes. Russian seller was so nice that put 1 spare -IR tube in package.

 

This is going to take long long... long time to manage all these.

Nice!

Much Fun!

post #3384 of 7215

Srarted the socket mod man anybody that does this i congratulate its a pain in the wazoo. heres a picture of the disposition of the wires 7-2 and 6-1 very hard to get a decent picture they are not soldered yet just wanted to know if it would work like this keeping in mind to keep hole for screw in the middle clear of the wires  Thanks.Will save pictures for later when everything is done

 

 


Edited by MIKELAP - 10/9/13 at 8:40am
post #3385 of 7215
Quote:
Originally Posted by MIKELAP View Post
 

Srarted the socket mod man anybody that does this i congratulate its a pain in the wazoo. heres a picture of the disposition of the wires 7-2 and 6-1 very hard to get a decent picture they are not soldered yet just wanted to know if it would work like this keeping in mind to keep hole for screw in the middle clear of the wires  Thanks.Will save pictures for later when everything is done

 

Now that is some heavy gauge wire, does the mod require such thick stuff?

At least the socket is nice and big and easy to work on...

Keep up the good work!

 

On a soldering side note:

I put a few of these together for sale last night, SOIC to 8 PIN DIP AD8620AR's.

The SOIC chips are not too bad to solder, the TSOP's are not much fun though.

:beerchug:

post #3386 of 7215

This is how those 6AQ4 tubes look like:

700

I can read from tube that it is CV2009 made in England. http://www.tubecollector.org/cv2009.htm It is normal 6AQ4 tube with that crap added on to bottom. Box says 6AQ4 CV417. Glass is not very clear and the other is nearly black. I managed to remove that crap and tubes works with LD.

 

Another thing i have to say is that 7-1 strap does not seem to work right with MK II. It adds hum and buzz. And it comes stereo, so i don't think i have made anything wrong with switch-mod.

post #3387 of 7215
Quote:
Originally Posted by TrollDragon View Post
 

Now that is some heavy gauge wire, does the mod require such thick stuff?

At least the socket is nice and big and easy to work on...

Keep up the good work!

 

I agree. I think your connecting wire is too thick. You want to wrap these wires around your pins very tightly, and it looks to me that this wire is a bit too thick and cumbersome to accomplish this with any ease. I use 30 gauge solid core wrapping wire and I would encourage you to give it a try.

 

Cheers

post #3388 of 7215

A small package arrived today with some Siemens and Mullard 6DJ8 / ECC88 tubes:

 

Siemens. The tube codes indicate that these were manufactured in Siemens' Halske factory in 1970/71.

 

 

Mullard. The tube codes indicate that these were manufactured in Mullard's Blackburn factory in 1970. As we have seen before, what is printed on the tubes can be misleading. One of these carries the CEI label and the other carries the Amperex Orange Globe label. However, they were manufactured in the same factory, within 3 months of each other. 

 

 

These tubes tested almost new and I paid $14.33 each, including shipping. Or as AFB pointed out, since these are dual triodes, I paid only $7.16 per triode. lol  Either way, I believe I was able to procure some rather nice tubes while staying under my budget of $15/tube.

post #3389 of 7215

Ya i know did not find 30 gauge wire settled for 22 gauge .What i tried instead of screwing around taking the adaptor apart i soldered wires on the exterior of the socket in the holes on top where the numbers are not pretty but alot alot less problematic now having a bit of a problem making solder stick to the metal what can be done for that. thanks.

post #3390 of 7215
Quote:
Originally Posted by MIKELAP View Post
 

Ya i know did not find 30 gauge wire settled for 22 gauge .What i tried instead of screwing around taking the adaptor apart i soldered wires on the exterior of the socket in the holes on top where the numbers are not pretty but alot alot less problematic now having a bit of a problem making solder stick to the metal what can be done for that. thanks.

This is what you are looking for:

 

http://www.ebay.com/itm/like/300814518650?lpid=82

 

In my local electronics store, they do no display this with regular wire. But if you ask specifically for "wrapping wire", I am quite sure that you can find it.

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