HI ,

just swap the OT wires to the output tubes (Pin 3). That should fix it.

cheers,

m.

I changed the V2 tube and the problem remains.
I noticed the feedback only appears in pentode mode.
When in triode mode I can have the master all the way up without feedback.

HI ,

just swap the OT wires to the output tubes (Pin 3). That should fix it.

cheers,

m.

Hi.ill try that, thank you

HI ,

just swap the OT wires to the output tubes (Pin 3). That should fix it.

cheers,

m.

If I change the wires in the pentode triode switch it has the same effect of changing them in the tubes sockets, correct?

I'm asking because it's easier to change in the switch then in the tube socket.

Can you make, I have fixed the same problem in this way.

greetings

Can you make, I have fixed the same problem in this way.

greetings

Thanks
I'll change the wires in the switch then.

Maybe the layout should be updated then, because both reported builds had the same problem...

Hallo,

"OT A" to "SC 1" ?

Regards, Dirk

Hallo,

"OT A" to "SC 1" ?

Regards, Dirk

Yes, I haven't tried but supposably that's the correct way

I am not sure but I think that we have tested this point the last time without a positive result. Are you able to make the change within the next days or does it take longer ? And can you post the result here again ? This would be great because I am afraid that we do not have time to check by ourself before the end of the week.

Best regards, Dirk

I've replaced the wires just in the switch with bad results. Still feedback in pentode mode and lot more uncontrollable feedback in triode.
I'm going to replace the wires that come from the output transformer to the sockets...

Ok.changing the blue and brown wires (ota and otb) solved this issue


I'll post some photos soon

Hi, attached a plan, so as the amplifier works with me wonderfully.
Change over original plan in Cyan Marked!

greetings

Hi, attached a plan, so as the amplifier works with me wonderfully.
Change over original plan in Cyan Marked!

greetings

You also changed the sc1 and sc2 wires in the pentode/triode switch...

Mine is like yours EXCEPT the sc1 and sc2 wiring in the switch

But I don't test the triode mode so maybe I'll have to change that to...

Hi, attached a plan, so as the amplifier works with me wonderfully.
Change over original plan in Cyan Marked!

greetings

I can confirm this is correct.