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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 213

post #3181 of 10502

Put together a wiring harness this morning, but am experiencing a major ground hum coming from the empty socket.....

 

Anyway, this is what I did:

 

Found some .062" Pin & Socket M/F Terminals at a local electrical supply store, and thought that the female sockets just might work:

 

 

 

Crimped the sockets to fit the pins, wired everything up and gave it a try:

 

 

It may well be that pin 9, the shield grid, needs to be grounded. I did hook up a wire to it and held it against the top right front screw, but didn't hear any difference. Anyway, I will keep looking at this and I hope someone else, with a little more electronics savvy, will give this a try.

 

For now, will go back to listening to my Mullard/Amperex setup, which by the way, sounds great. A nice, wide, 3D sound stage, great clarity and transparency, warm and engaging tonality and unlike the GE 6AV6, these have a liquid and musical sound, lots of toe-tapping.

 

These 6DJ8 / ECC88 are well worth the extra time and effort it takes to purchase and wire up some adapters. Highly recommended! :)

post #3182 of 10502
Quote:
Originally Posted by TrollDragon View Post

Also heat the pin / wire with the iron and touch the solder to it, don't just melt the solder with the iron. biggrin.gif

 

Quote:
Originally Posted by gibosi View Post
 

 

Have fun learning to solder. In my experience, the key to a good electrical solder joint is to make sure you have a good mechanical connection first. Wrap those wires around the adapter pins 2 or 3 times and make sure they are good and tight. If you just touch the wire to the pin and add solder, the joint might end up being pretty bad. Solder on its own is actually a rather poor electrical conductor and its real purpose is to simply ensure that the joint doesn't work loose over time. Good luck! :)

 

Thanks guys for the tips..What kind of solder would you guys recommend leaded or unleaded and also what diametre. Thanks 

post #3183 of 10502
Quote:
Originally Posted by MIKELAP View Post
 

 

 

Thanks guys for the tips..What kind of solder would you guys recommend leaded or unleaded and also what diametre. Thanks 

This is what I use on a daily basis.

http://www.amazon.com/Kester-Rosin-Core-Solder-Spool/dp/B00068IJPO#productDetails

post #3184 of 10502
Quote:
Originally Posted by MIKELAP View Post
 

 

 

Thanks guys for the tips..What kind of solder would you guys recommend leaded or unleaded and also what diametre. Thanks 

 

This is what came with my soldering iron and it seems to be quite fine. But quite frankly, I haven't done any research to find the "best" solder.

 

Oh, it looks to be similar to TrollDragon's recommendation. :)

 

post #3185 of 10502

 

Quote:
Originally Posted by TrollDragon View Post
 

This is what I use on a daily basis.

http://www.amazon.com/Kester-Rosin-Core-Solder-Spool/dp/B00068IJPO#productDetails

 

Thanks also this thing looks very useful do you think so ! 


Edited by MIKELAP - 9/30/13 at 9:05am
post #3186 of 10502
The "Helping Hand" is very useful as well, I use my little suction base vise and magnified visor more than my "Helping Hand" these days.
post #3187 of 10502
Quote:
Originally Posted by TrollDragon View Post

The "Helping Hand" is very useful as well, I use my little suction base vise and magnified visor more than my "Helping Hand" these days.

 

I was looking at suction vises on amazon what model would be more ergonomic or useful do you think, theres a ton of them 

post #3188 of 10502

You get what you pay for in those... The PanaVise are very nice but a bit spendy.

 

I have one exactly like this Stalwart.

http://www.amazon.com/Stalwart-75-30654-Portable-Vacuum-Degree/dp/B003BIN38E/ref=pd_sim_sbs_hi_12

They need a really smooth surface to suction to, if you don't have that then a clamp on one might be better.

 

This is the Visor I use as well, a little pricey but the lenses are glass and not plastic like the $6 ones, also it has proper optics and you don't have to try and move one of your eyes close to the other one to get it to focus properly like you do in the $6 version.

http://www.amazon.com/dp/B0015IN8J6/ref=biss_dp_t_asn

 

They have different lenses you can purchase from 1.5X to 3.5X at different focal lengths

http://www.amazon.com/Donegan-OptiVisor-Headband-Magnifier-Magnification/dp/B0068OSIIS/ref=sr_1_5

 

All fun!

:beerchug:

post #3189 of 10502
Quote:
Originally Posted by TrollDragon View Post
 

You get what you pay for in those... The PanaVise are very nice but a bit spendy.

 

I have one exactly like this Stalwart.

http://www.amazon.com/Stalwart-75-30654-Portable-Vacuum-Degree/dp/B003BIN38E/ref=pd_sim_sbs_hi_12

They need a really smooth surface to suction to, if you don't have that then a clamp on one might be better.

 

This is the Visor I use as well, a little pricey but the lenses are glass and not plastic like the $6 ones, also it has proper optics and you don't have to try and move one of your eyes close to the other one to get it to focus properly like you do in the $6 version.

http://www.amazon.com/dp/B0015IN8J6/ref=biss_dp_t_asn

 

They have different lenses you can purchase from 1.5X to 3.5X at different focal lengths

http://www.amazon.com/Donegan-OptiVisor-Headband-Magnifier-Magnification/dp/B0068OSIIS/ref=sr_1_5

 

All fun!

:beerchug:

 

Quote:
Originally Posted by TrollDragon View Post
 

You get what you pay for in those... The PanaVise are very nice but a bit spendy.

 

I have one exactly like this Stalwart.

http://www.amazon.com/

Stalwart-75-30654-Portable-Vacuum-Degree/dp/B003BIN38E/ref=pd_sim_sbs_hi_12

They need a really smooth surface to suction to, if you don't have that then a clamp on one might be better.

 

This is the Visor I use as well, a little pricey but the lenses are glass and not plastic like the $6 ones, also it has proper optics and you don't have to try and move one of your eyes close to the other one to get it to focus properly like you do in the $6 version.

http://www.amazon.com/dp/B0015IN8J6/ref=biss_dp_t_asn

 

They have different lenses you can purchase from 1.5X to 3.5X at different focal lengths

http://www.amazon.com/Donegan-OptiVisor-Headband-Magnifier-Magnification/dp/B0068OSIIS/ref=sr_1_5

 

All fun!

:beerchug:

 

Thanks again that vacuum base vise will work good because my table has a glass top on it Thanks , time to go shopping .

post #3190 of 10502

Hi All,

 

Some time back (page 199) I wrote that the 6DT6(A) tube makes me feel toe tapping good, and the 6AV6 tube makes me marvel at the holographic 3D super detailed sound stage with it's natural voice presentation and immediacy. Surely these two tubes are among the best we found to date (together with the 6AU6/8425 and 6AH6WA/6485 tubes.)

 

Since the advanced DIY soldering projects with wires and adapters are beyond my scope I decided to explore the 6AV6 tube family to see if we could find a tube that combines the awesome intellectual holographic presentation with the emotional impact of the 6DT6 tubes. It was pointed out that the 6AV6 tubes with a an inverted rectangular box on top of the top mica sounded excellent - without the box not the same results. I had five 6AV6 tubes on hand, but only two had the box on the top getter. Even though one was a Sylvania and one a Tung Sol, I burnt them in and was astounded at the sound.

 

Found a lot of six 6AV6 tubes for cheap ($1.60 each incl shipping). As Providence had it, all six had the box, and in this lot I also found the exact mate to both the Sylvania and the Tung Sol tubes! However, one tube (GE) broke in shipping.

 

Here are two pictures of the rectangular box on the top mica. Portions of the glass envelope of the tube have been removed for clarity by the USPS for your viewing pleasure. On its own, my camera decided on the sepia color, no doubt to impart a turn of the century flavor.

 

 

So far, three types have been auditioned: RCA, Sylvania and Tung Sol. They all sound great, with the nod going to the RCA for bringing in more of the emotional (toe tapping impact). The entire sound range is extremely well balanced with delicious detail and sound stage.

 

I highly recommend getting a pair of any of these 6AV6 tubes with the box on the top mica. Snip off pins 5 and 6, put a piece of electric tape on the stubs, and set the LD on the EF92 setting.

 

WARNING: The sound is so addictive that you will find it hard to stop listening and going to sleep regular time! (Ouch! Almost 12:30 am, and I have to get up at six!)

post #3191 of 10502

Finally rolling in the heptodes tonight. :)  What do you all think, EF92 or EF95?

post #3192 of 10502
Quote:
Originally Posted by mordy View Post
 

Hi All,

 

Some time back (page 199) I wrote that the 6DT6(A) tube makes me feel toe tapping good, and the 6AV6 tube makes me marvel at the holographic 3D super detailed sound stage with it's natural voice presentation and immediacy. Surely these two tubes are among the best we found to date (together with the 6AU6/8425 and 6AH6WA/6485 tubes.)

 

Since the advanced DIY soldering projects with wires and adapters are beyond my scope I decided to explore the 6AV6 tube family to see if we could find a tube that combines the awesome intellectual holographic presentation with the emotional impact of the 6DT6 tubes. It was pointed out that the 6AV6 tubes with a an inverted rectangular box on top of the top mica sounded excellent - without the box not the same results. I had five 6AV6 tubes on hand, but only two had the box on the top getter. Even though one was a Sylvania and one a Tung Sol, I burnt them in and was astounded at the sound.

 

Found a lot of six 6AV6 tubes for cheap ($1.60 each incl shipping). As Providence had it, all six had the box, and in this lot I also found the exact mate to both the Sylvania and the Tung Sol tubes! However, one tube (GE) broke in shipping.

 

Here are two pictures of the rectangular box on the top mica. Portions of the glass envelope of the tube have been removed for clarity by the USPS for your viewing pleasure. On its own, my camera decided on the sepia color, no doubt to impart a turn of the century flavor.

 

 

So far, three types have been auditioned: RCA, Sylvania and Tung Sol. They all sound great, with the nod going to the RCA for bringing in more of the emotional (toe tapping impact). The entire sound range is extremely well balanced with delicious detail and sound stage.

 

I highly recommend getting a pair of any of these 6AV6 tubes with the box on the top mica. Snip off pins 5 and 6, put a piece of electric tape on the stubs, and set the LD on the EF92 setting.

 

WARNING: The sound is so addictive that you will find it hard to stop listening and going to sleep regular time! (Ouch! Almost 12:30 am, and I have to get up at six!)

 

Hey mordy i also checked my 6AV6 tubes for that box on the top mica turns out i have several pairs of those ,G.E. ,WESTINGHOUSE, LORENZ ,and  HIT RAYS, Its true those are among the best sounding tubes with the  with 6AU6 those are the tubes i listen to alot.

And regarding the new double triode adventure its way over my head but i will take it slowly and wait till everything is sorted out and learn the procedure and after i will do it.theres no rush .Tubes and sockets are on the way.meanwhile time to get some tools and practice my soldering.

post #3193 of 10502
Quote:
Originally Posted by Edgard Varese View Post
 

Finally rolling in the heptodes tonight. :)  What do you all think, EF92 or EF95?

 

It really depends on the heptode. Some heptodes sound better EF92 and others EF95. So try both to determine which setting you prefer.

post #3194 of 10502

Hi Mikelap,

 

Did you have any opportunity to compare the 6AV6 tubes with the box top? I am looking into buying more of them, but it would be very helpful to know if some are better than others.

 

I am especially interested in the Lorenz, HitRay and Westinghouse tubes.

post #3195 of 10502

I've had currently about 30-40 hours on the RCA 6DT6A's and I can say I definitely like it the most from the rest of the tubes i've tried. Bass impact reaches nice deep and punchy and doesn't bleed into the mids or drown out the highs.  Nice and detailed but not fatiguing like the E91H 2-7 and Televania 2-7 strap, I let some friends try my LD MKIV SE at a gathering and everyone started coming to try it out with all their different headphones xD , it's a really great amp and the tubes are just delicious if only there was a lot of 5. One sad thing that happened to me was I dropped one of my Televania's T.T shattered but good thing I have had a lot of 5 but kind of sad to waste a perfectly good tube...will be looking out for lots of RCA 6DT6A as spares! One thing I wished was that the 6DT6A's had just a little bit more soundstage and just a teensy bitsy more detail but that can be solved with a good DAC(details not soundstage).

 

Stumbled upon this http://www.r-type.org/exhib/aad0301.htm the PCL800 tube which has 9 pins which is a triode output pentode, so was wondering how'd it fare when put into the "expriments" that are being held.


Edited by siles1991 - 10/1/13 at 10:47am
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