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WA22 let's roll some tubes (Done Mod, Burnning-in) - Page 27

post #391 of 402

Has anybody discussed the use of tube adaptors in the WA22 with Jack Wu? 

 

I know Mikhail sold tube adaptors for Singlepower amps and everybody by now should know he was a fraud.  His amps also have failed at an alarming rate.  Most failures probably resulted from poor construction, but it is possible that the use of tube adaptors he sold hastened their demise.

 

Since then, a number of people who understand something about tube amp design (Kevin Gilmore, Nikongod) have written elsewhere on Head-Fi that tube adaptors are a terrible idea and that one should only use the tubes the amp was designed for. 

 

In the same vein,  I know of no manufacturer of tube preamps or power amps for use in speaker rigs who has ever sanctioned, let alone recommended, the use of tube adaptors in their components. 

post #392 of 402

x2. Thanks for bringing this up.

 

Craig Uthus (Eddie Current LLC) advised me against using tube adapters in his Zana Deux SE. The specific adapter is the 6C8G to 6SL7. He emailed me:

 

"You can't put a 6SL7/6C8G in the ZD because it has twice the heater current, and it will not bias up correctly."

 

This adapter is specifically made to use 6C8G tubes in place of 6SL7 but Craig strongly advises against the practice in his ZDse.

 

Up until last night I used 6F8G to 6SN7 adapters in my WA22. Now I've put the 6SN7 tubes back into my Woo and I am wondering if I should ever use those adapters again. I just don't want to use an adapter that wasn't sanctioned by Jack.

post #393 of 402


 

Quote:
Originally Posted by Clayton SF View Post
Up until last night I used 6F8G to 6SN7 adapters in my WA22. Now I've put the 6SN7 tubes back into my Woo and I am wondering if I should ever use those adapters again. I just don't want to use an adapter that wasn't sanctioned by Jack.


I do use the 6F8G to 6SN7 adapter with my WA22 few times.  I did emailed Jack this adapter, he did said it is ok to use and he do sell them.  From what I read, the spec on the 6F8G is the same as 6SN7. (I may be wrong, I can't find where did I saw that)

post #394 of 402
Quote:
Originally Posted by jc9394 View Post

I do use the 6F8G to 6SN7 adapter with my WA22 few times.  I did emailed Jack this adapter, he did said it is ok to use and he do sell them.  From what I read, the spec on the 6F8G is the same as 6SN7. (I may be wrong, I can't find where did I saw that)


Well that's a relief. I can now throw the 6F8G's back into the mix.Thanks!

post #395 of 402
Thread Starter 

Jack of Wooaudio as now have in-house made 6F8G to 6SN7 adapters. All my adapters made by Glenn also never failed. I have used them over how long? The key is these adapters have to be made by people who have knowledge and skill to do so

post #396 of 402

Gec U52, VT99, 5998 for my WA22

 


Edited by M25K2 - 8/2/13 at 12:50am
post #397 of 402

GEC u52!!!1 nice tubes!

 

how does it sound? i'm thinking of buying one for my WA6-SE

post #398 of 402

Hi 

New Amp for me, so just going through the motions of 'testing' the tubes I've bought .

Best combination so far GEC 6AS7G Curved/ Mullard ECC32 / GEC 5R4GY curved(looks like a U52?) with Classical music( British ears-British tubes??)Just rolled in a Brimar 5Z4G. (also tried WE422A TS 5995 Mullard 6080)Full report later.

 

I also have a pair of ECC33s which I need some feedback on.Not so much for the SQ but as a viable sub for 6SN7. Any views?

Woo Audio & Tube supplier (respected source in UK) say YES, Seller who supplied the pair(respected source in US) says NO.

Thank you.

post #399 of 402
I have the ECC33 in my WA22 right now for a few days already. No worries.
post #400 of 402
Interesting...i did not think gec made a 5r4gy, it might actually be a u52 kinda like how some u52 are labeled 5u4g or cv575 or cv1071
post #401 of 402

When you have two opposing opinions , both from reliable sources, it's difficult to know who to go with.Just shows,even the best aren't always right?

post #402 of 402

Yes, definitely  , GEC 5R4GY, but I as I said, looks every bit a U52!

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