[strangelove]

Doing some looking on the internet it seems the 6922 and ECC8 are compatible. However I can't find if either of these are supposed to be compatible with the EZ80 that the amp is actually supposed to have. Could that be the problem?

 

[Oskari]

Quote:

Originally Posted by strangelove /img/forum/go_quote.gif Doing some looking on the internet it seems the 6922 and ECC8 are compatible. However I can't find if either of these are supposed to be compatible with the EZ80 that the amp is actually supposed to have.

The EZ80/6V4 is a full-wave rectifier while the ECC88/6DJ8 is a double triode. They are not compatible at all!

The E88CC/6922 is a very close relative of the ECC88/6DJ8 and can replace it.

 

[holland]

Quote:

Originally Posted by strangelove /img/forum/go_quote.gif Doing some looking on the internet it seems the 6922 and ECC8 are compatible. However I can't find if either of these are supposed to be compatible with the EZ80 that the amp is actually supposed to have. Could that be the problem?

Yeah, as Oskari said. You can't sub a 6922 for an EZ80. Is that what you did and that's when you got the noise? Oh boy...I'm not even sure what'll happen there.

 

[strangelove]

That's what it came with. The last owner didn't provide any EZ80 and that's how he was using it.

I subbed out the Tesla ECC88 for the 6922 that was in there and the problem has completely resolved and the amp sound great. So now what I have in is:

Sovtek 6C19 x2 (back row, outside)
Electro-harmonix ECC82 x2 (back row, inside)
Tesla ECC88 x2 (front row)

 

[HeatFan12]

Quote:

Originally Posted by strangelove /img/forum/go_quote.gif That's what it came with. The last owner didn't provide any EZ80 and that's how he was using it. I subbed out the Tesla ECC88 for the 6922 that was in there and the problem has completely resolved and the amp sound great. So now what I have in is: Sovtek 6C19 x2 (back row, outside) Electro-harmonix ECC82 x2 (back row, inside) Tesla ECC88 x2 (front row)

Great to hear it's working for you.

Jack changed the tube complement on the WA4 including the EZ80 instead of the 6922 in the newer models WooAudio 4 - Single-Ended Triode Class-A Vacuum Tube Headphone Amplifier

I found this http://www.head-fi.org/forums/f5/woo...s-pics-204949/ where there is no EZ80.

 

[vcoheda]

in my experience, i would say that in general a "hum" is the result of some type of grounding issue or noise caused by a component and "static" is a tube issue.

 

[IPodPJ]

I'm glad you fixed the problem. But also noise and static can be caused by fluorescent lights and refrigerators that are on the same circuit. It's best to avoid putting audio equipment on that circuit.

 

[Skylab]

Quote:

Originally Posted by holland /img/forum/go_quote.gif Yeah, as Oskari said. You can't sub a 6922 for an EZ80. Is that what you did and that's when you got the noise? Oh boy...I'm not even sure what'll happen there.

Yeah, this is very worrisome - if the amp is actually designed for the EZ80 still, putting a 6922/E88CC in there instead could be disaster. You should really call Jack and make sure that the amp topology actually changes to allow this.

The current WA4 certainly still uses the EZ80 rectifier tube.

 

[atbglenn]

[size=small]The change was to the rectifier, not the driver tubes. The EZ80 replaced the 6X4 rectifier, not the 6922. Do not under any circumstances replace an EZ80, with a 6922, or visa versa. It would probably fry your amp [/size]

 

[Skylab]

That is exactly what I thought.

 

[HeatFan12]

Just to clear my post up in reference to the 6922 & EZ80.

Holland advised that you can't sub a 6922 for an EZ80. Of course this is correct. The OP advised that there are no EZ80s in the batch he received with his amp. The OP would have never found EZ80s in that batch because HIS WA4 does not use the EZ80.

Older WA4- 2X 6C19
2X ECC82
2X 6922

Newer WA4- 2X 6C19
2X ECC82
2X EZ80


The newer WA4 does not use the 6922. Instead, the EZ80 has been implemented.

I apologize for the confusion. The above is what I was trying to convey. The two links I posted are of the older and newer models where the difference is evident.

Yes, Glenn that is correct, the WA2 no longer uses the 6X4 is has been replaced with the EZ80.


Quote:

Do not under any circumstances replace an EZ80, with a 6922, or visa versa. It would probably fry your amp

Agreed....I know the 4TH of July just passed and I'm sure we all kept our fireworks outdoors...

 

[Skylab]

Odd - so the old WA4 used 6922's (which are a dual-triode and NOT a rectifier tube), and in the new WA4 they went away from the 6922 and now use a rectifier tube instead? That would be a major change, but it does seem that is what Woo did.

 

[atbglenn]

Quote:

Originally Posted by atbglenn /img/forum/go_quote.gif [size=small]The change was to the rectifier, not the driver tubes. The EZ80 replaced the 6X4 rectifier, not the 6922. Do not under any circumstances replace an EZ80, with a 6922, or visa versa. It would probably fry your amp [/size]

Why was I thinking WA2? I'm confused

 

[strangelove]

Quote:

Originally Posted by HeatFan12 /img/forum/go_quote.gif Great to hear it's working for you. Jack changed the tube complement on the WA4 including the EZ80 instead of the 6922 in the newer models WooAudio 4 - Single-Ended Triode Class-A Vacuum Tube Headphone Amplifier I found this http://www.head-fi.org/forums/f5/woo...s-pics-204949/ where there is no EZ80.

The amp in that last link is actually the one I'm currently in possession of. I'm still concerned one of the 6C19 tubes might be bad because before the static changed channels when I swapped the tubes. I'm going to try and get all of the tubes checked if I can.

I also emailed Jack to confirm that the arrangement of tubes I have is the correct one.

I have to say though it sounds pretty darn great. It's a shame because according to Jack the WA4 is now discontinued even though it's still listed on their web page.

 

[strangelove]

The enigma deepens. Just got this response via email from Jack:

"We have never used 6922 in place of EZ80 for the WA4. These are completely different tubes. If you misused, the amp would be likely damaged.

We have used 6X4 or 6Z4 for the WA4. These are the tubes you should be using."