[LeMat]

I stick to this thread to update my feedback after having maxxed my WA2 by myself (only the voltage filtering section, the coupling caps were already BG). There's no better way to appreciate the work done by Jack... damn it took me a while to mod it !
Even though I know it takes a looooonngg time for these power tank to settle, let me tell that I already noticed a real difference. Either it's due to :
- going from the stock caps at 330 uf to the BG at 220 uf
- the better quality of the BG
but the sound appears more balanced, with a better bass presentation, stronger with more impact (even on my K701 !) and a smoother mid range. Trebble seems not to be affected.
Call it psychological but I hear it and like it.
To future WA2 owners, I recommend you go maxxed.

 

[pzm9pzm9]

Can anyone recommand me a pair of tube to upgrade over the stock tubes? My budget is under $100. I wish to buy NOS tubes. Where should I look for buying NOS tubes?

 

[zer010gic]

I have a maxed out WA2 and I am wondering if there is a way to get a little more gain out of the preamp? I am currently using the Amperex Bugle Boy 6DJ8s. While I love the SQ I would like to be able to get a little more volume when used as a preamp.

 

[Skylab]

Quote:

Originally Posted by pzm9pzm9 /img/forum/go_quote.gif Can anyone recommand me a pair of tube to upgrade over the stock tubes? My budget is under $100. I wish to buy NOS tubes. Where should I look for buying NOS tubes?

What are the stock tubes?

Quote:

Originally Posted by zer010gic /img/forum/go_quote.gif I have a maxed out WA2 and I am wondering if there is a way to get a little more gain out of the preamp? I am currently using the Amperex Bugle Boy 6DJ8s. While I love the SQ I would like to be able to get a little more volume when used as a preamp.

6922's will have a little more gain than 6DJ8's. Try the JAN Sylvanias - they are better than the JAN Phillips.

 

[zer010gic]

What about the JAN Sylvanias 7308 or would you still recommend the 6922 version.


Corey

Quote:

Originally Posted by Skylab /img/forum/go_quote.gif What are the stock tubes? 6922's will have a little more gain than 6DJ8's. Try the JAN Sylvanias - they are better than the JAN Phillips.

 

[Skylab]

Quote:

Originally Posted by zer010gic /img/forum/go_quote.gif What about the JAN Sylvanias 7308 or would you still recommend the 6922 version. Corey

I have never tried the 7308.

 

[zer010gic]

Any body have an opinion on the Amperex 6922 PQ?

 

[xenithon]

I do not have the PQ, but do have a pair of Philips (made by Amperex, Holland) E88CC gold-pins. They are probably may favorites preamp tube - a tough call between those and the Mullard ECC88's

 

[Oskari]

Dutch-made Amperex 6922 PQ = Dutch-made Philips E88CC SQ

and I don't think that the PQ or SQ is important, I think it is marketing hype. (I could be wrong. Please prove me wrong if you can.)

A Philips E88CC most certainly was not made by Amperex, Holland. Philips was, and still is, a Dutch company, and their factories in the Netherlands were Philips factories, not Amperex factories. At this point in history, Amperex was owned by Philips. Amperex made tubes in the United States but also put their brand on tubes made by others, including tubes made by Philips in the Netherlands.

By the way, many write "Phillips" with two L letters. This Philips, however, only has one L. This was also true of Philips ECG and their JAN tubes.

(Pet peeves. Sorry.)

 

[Skylab]

Quote:

Originally Posted by Oskari /img/forum/go_quote.gif A Philips E88CC most certainly was not made by Amperex, Holland. Philips was, and still is, a Dutch company, and their factories in the Netherlands were Philips factories, not Amperex factories. At this point in history, Amperex was owned by Philips. Amperex made tubes in the United States but also put their brand on tubes made by others, including tubes made by Philips in the Netherlands.

Right - Phillips made the tubes for Amperex, not the other way around.

 

[Oskari]

Quote:

Originally Posted by Skylab /img/forum/go_quote.gif Phillips

Auts!

Please reread my previous message.

 

[Skylab]

Sorry - force of habit.

 

[zer010gic]

Well I just picked up some Siemens Cca tubes off ebay lets see how they work out.


Corey

 

[pzm9pzm9]

Good day everyone.

Could anyone kindly help me for understanding the matching tubes and reading conductance values....

I just bought 4 Tung-Sol 5998 and the seller indicated the mutual conductance test values as 65/76, 78/77, 83/74 and 74/77.

Which two would you suggest for rolling power tubes for my WA2?

should it be 78/77 and 74/77? or 78/77 and 83/74 ?

what values should be within 5% in two tubes? For example, 78/77 and 83/74 , do you compare between 78 and 83?? and 77 and 74? and see if they both fall within 5%?

Also, the seller said the minimum acceptable value of his tester (TV-7D/U)is 40/40. Where did he get that 40/40 value from? why is my tubes have greater value than 40/40. Do these values indicate the expected life time of the tubes? What can I be informed from these values??

Thanks in advance

 

[pzm9pzm9]

or... may I just ask if WA2 requires matched pair for power tubes?

Thanks.