Woo Audio Amp Owner Unite

[DarKu]

my RCA 6FD7 works like a charm in my WA6SE 2 months straight, actually it is the best drive tube for my ear

PS: newer WA6SE can use 6FD7 without any problems

 

[atbglenn]

Quote:

Originally Posted by DarKu /img/forum/go_quote.gif my RCA 6FD7 works like a charm in my WA6SE 2 months straight, actually it is the best drive tube for my ear PS: newer WA6SE can use 6FD7 without any problems

There have been reported issues using a 6FD7 in an SE. Jack said they weren't compatible, but that was a few months ago. I guess he updated it so it will work now. Good to know

 

[dannie01]

Quote:

Originally Posted by atbglenn /img/forum/go_quote.gif Yes. The only exception that I know of is the 6FD7, which will only work safely in the standard 6, not SE.

Hey Glenn, I still have a pair of GE 6FD7 fat bottle using in my WA6SE and at least for a month or more. No problem at all and it do sounds good with the SP 274B.

 

[atbglenn]

Quote:

Originally Posted by dannie01 /img/forum/go_quote.gif Hey Glenn, I still have a pair of GE 6FD7 fat bottle using in my WA6SE and at least for a month or more. No problem at all and it do sounds good with the SP 274B.

Hey Danny,

You modded yours extensively didn't you? Maybe that's why your "older" SE plays nice with that tube. If you remember correctly there were several people having problems with loud pops, snaps, etc using that tube. Jack did say not to use them in the SE.

 

[DarKu]

actualy i find it (6FD7) best for rock and electronica, it's pucnhy, fast, accurate, can i ask for more ?

Also the gain (power?) is about 30-35% more with this tube

 

[atbglenn]

Quote:

Originally Posted by DarKu /img/forum/go_quote.gif actualy i find it (6FD7) best for rock and electronica, it's pucnhy, fast, accurate, can i ask for more ? Also the gain (power?) is about 30-35% more with this tube

I sometimes use Sylvania big bottle 6FD7's in my standard 6. Lots more gain and very punchy. As you say, great for rock. For jazz I prefer Sylvania big bottle 6EW7's.

 

[dannie01]

Hi Glenn,

Yes, I have my WA6SE modded swapped the original cathode plate caps, the 470uf/100v into 2 x BlackGate 220uf/ 160V NH. And that was told by takezo that the 6FD7s will work fine in the WA6SE.

"actually, i meant the cathode plate cap that is one the small circuit board. jack uses
a 470uf/100v cap there. the cathode bypass/bias cap is the 220uf/16v caps.
anyway, mine hover around 85v when i use the 6fd7 but maybe convenants caps
were not up to par even at 100v... it is a good idea to change it out to at least 160v
for the 6fd7 and others. and yes, the 3% increase in current draw is what makes
the output and power transformers a bit warmer. but it's still way inside of what jack
told me last year when he said the output transformers will take up to 1.2A per tube
for a total of 2.4A."

I hope takezo don't mind that I quote the PM here.

 

[atbglenn]

Quote:

Originally Posted by dannie01 /img/forum/go_quote.gif I hope takezo don't mind that I quote the PM here.

I don't think he'd mind. After all, we're all here to help each other in anyway we can, right?

 

[Clayton SF]

Hey, does anyone know if I can use metal rectifier tubes in Woos? I have a 5Z4 metal tube. I didn't want to blow up the WA22.

-MeAgain

 

[dannie01]

Quote:

Originally Posted by Clayton SF /img/forum/go_quote.gif Hey, does anyone know if I can use metal rectifier tubes in Woos? I have a 5Z4 metal tube. I didn't want to blow up the WA22. -MeAgain

Hey Clayton, Seamaster has put a 5Z4 in his WA22 without problem but the Amperex GZ34 sounds better.

Edit. Sorry, my bad, he has tried the Mullard 5AS4 instead of 5Z4. Please find his thread HERE for tube rolling of his WA22.

 

[the_equalizer]

Quote:

Originally Posted by regal /img/forum/go_quote.gif Hello, I am looking at the Woo6 and moding it to sound as good as the SE. The main reason that the SE sounds better than the standard model is that the output is taken from the plates, ie no cathode follower as in the standard model. (also splitting the PS will nearly equal the SE.) So my question is what tube has the lowest plate resistance that works in the Woo6? Moding to a plate output will require a tube with a low plate resistance to keep the output impedance low. Do the standard tubes in the SE work in the standard model?

According to my old "RCA Reception Tubes" manual the following are the aproximate (sic) plate resistance values for the second triode operating as a class A amplifier:

6EW7 - 800 ohms
6DE7 - 925 ohms
6FD7 - 800 ohms

cheers!

 

[tosehee]

I have no clue about plate resistance, but that 6DE7 is really awesome..

 

[Seamaster]

Quote:

Originally Posted by dannie01 /img/forum/go_quote.gif Hey Clayton, Seamaster has put a 5Z4 in his WA22 without problem but the Amperex GZ34 sounds better. Edit. Sorry, my bad, he has tried the Mullard 5AS4 instead of 5Z4. Please find his thread HERE for tube rolling of his WA22.

5Z3 works and sound great with WA22 with adapter. 5Z4 works with WA22 no problem, they are a part of 5AR4 family. As for Amperex GZ34, they sound cool, so you need some warm tubes to pair with.

 

[Suprfly2k]

Quote:

Originally Posted by dannie01 /img/forum/go_quote.gif Hi Glenn, Yes, I have my WA6SE modded swapped the original cathode plate caps, the 470uf/100v into 2 x BlackGate 220uf/ 160V NH. And that was told by takezo that the 6FD7s will work fine in the WA6SE.

I have asked Jack whether the 6FD7 will damage my October delivered WA6SE. I'll post the verdict.

 

[dannie01]

Let us know the verdict.