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Vorstellung 5Ä3

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Offline 456Onno456

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Re: Vorstellung 5Ä3
« Antwort #105 am: 23.09.2017 21:42 »
HI ???,

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

cheers,

m.

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Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #106 am: 24.09.2017 16:45 »
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.

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Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #107 am: 24.09.2017 16:47 »
HI ???,

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

cheers,

m.
Hi.ill try that, thank you

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Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #108 am: 24.09.2017 16:53 »
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.

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Offline Bluesboge

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Re: Vorstellung 5Ä3
« Antwort #109 am: 24.09.2017 16:57 »
Can you make, I have fixed the same problem in this way.

greetings

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Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #110 am: 24.09.2017 17:00 »
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...


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Offline Dirk

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Re: Vorstellung 5Ä3
« Antwort #111 am: 24.09.2017 19:40 »
Hallo,

"OT A" to "SC 1" ?

Regards, Dirk
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Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #112 am: 24.09.2017 20:27 »
Hallo,

"OT A" to "SC 1" ?

Regards, Dirk

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

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Offline Dirk

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Re: Vorstellung 5Ä3
« Antwort #113 am: 24.09.2017 22:04 »
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
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Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #114 am: 24.09.2017 22:10 »
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...

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Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #115 am: 24.09.2017 22:45 »
Ok.changing the blue and brown wires (ota and otb) solved this issue


I'll post some photos soon

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Offline Bluesboge

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Re: Vorstellung 5Ä3
« Antwort #116 am: 24.09.2017 22:46 »
Hi, attached a plan, so as the amplifier works with me wonderfully.
Change over original plan in Cyan Marked!

greetings

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Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #117 am: 24.09.2017 22:49 »
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

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Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #118 am: 24.09.2017 22:58 »
But I don't test the triode mode so maybe I'll have to change that to...

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Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #119 am: 24.09.2017 23:47 »
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.