[sunneebear]

I checked the specs and it's numbers match up with the KT88 so I thought it would be fine. Not having any problems but Victor says to watch the FETs.

 

[JK-47]

I'll take Victors word, he knows what he's talking about.

 

[JK-47]

I checked the specs and it's numbers match up with the KT88 so I thought it would be fine. Not having any problems but Victor says to watch the FETs.

The numbers don't really match up...

 

[sunneebear]

  I'll take Victors word, he knows what he's talking about.

Agreed.  After the designers at Elekit, I don't think anyone knows more about this amp.

 

[fccn75]

Very interesting read for which I have not been around for a long time.  Call this whatever you like but as soon as I started catching the last few pages of this thread my left channel tube (EL34) died.  And nothing but loud hum coming from the left.
 
As usual suspect per Vkung, yep, left channel FET is shorted and R18? or 17,  I forget (180 ohm carbon resistor) totally burned almost through PCB.  Was using in Ultra-linear mode all these years.  Tube definitely died.
 
Curiosity question for Victor:  it appears the EL34 died taking out the FET & resistor overdrawing the designed current spec.  Would the same thing happen if Triode mode is used? 

 

[vkung]

replace the FETs will solve the issue

 

[sunneebear]

Hello Victor,
Any word on the upgrade output transformers?

 

[fccn75]

  replace the FETs will solve the issue

Thanks Victor for confirmation.  Hope you don't mind me asking why did the 180 ohm resistor burned up?  

 

[vkung]

too much current.. . this  will protect your OPT.
If you need FET and 180 ohm to fix the issue, I have these repair parts.

 

[fccn75]

Nice to know, thanks, but was able to order from Mouser for both parts.  Harder thing to find are the EL34's, ugh...

 

[vkung]

Please consider.. Psvane KT88 MK II..

 

[fccn75]

Read all great things about the Psvane.  But I have a pair of Genelex KT88 but much prefer the EL34's.  Based on reading alone, the Psvane KT88 is on another level of performance.  Oh well...  

 

[vkung]

It is good and reliable.. I like EH6L6GC too. Did you replace the driver tube? . I like Psavne MK II 12AU7.   

 

[430011]

Fccn75-
Have you tried your KT-88 in triode? In ultralinear I much preferred EL34 over KT-88, but when I had a free weekend to experiment I found I prefer triode KT-88 over ultralinear EL-34.

 

[vkung]

yes... I like the UL setting with KT88