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January 30, 2023, 07:43:47 PM
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First startup ... Pls Help!
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Topic: First startup ... Pls Help! (Read 928 times)
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mlineHK
Jr. Member
Posts: 30
Re: First startup ... Pls Help!
«
Reply #30 on:
March 26, 2022, 08:00:53 PM »
hi Paul,
these r the results after re-solder every contact on all 3 boards.
IA A and B 274v
6.3 57v
-6.3 52v
275 275v
Biasing 1.45v
Breg A 273v
Breg B 216v
Kreg A 1.18v
Kreg B 10.66v
OA 1.76v
OB 2.02v
«
Last Edit: March 26, 2022, 09:47:09 PM by mlineHK
»
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Paul Birkeland
Global Moderator
Hero Member
Posts: 17914
Re: First startup ... Pls Help!
«
Reply #31 on:
March 27, 2022, 05:40:09 AM »
Resoldering your connections brought one side into proper operation. I would suggest that you also resolder the center PC board and perhaps that will fix the other side.
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
mlineHK
Jr. Member
Posts: 30
Re: First startup ... Pls Help!
«
Reply #32 on:
March 27, 2022, 06:13:52 AM »
That's what I thot and I have done re soldering the middle board as well. I will redo again and see.
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Paul Birkeland
Global Moderator
Hero Member
Posts: 17914
Re: First startup ... Pls Help!
«
Reply #33 on:
March 27, 2022, 06:15:51 AM »
You could also replace the 431 regulator on the side with the very low Kreg voltage.
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
mlineHK
Jr. Member
Posts: 30
Re: First startup ... Pls Help!
«
Reply #34 on:
March 27, 2022, 07:05:16 AM »
Thank you Paul will try to replace them.
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Paul Birkeland
Global Moderator
Hero Member
Posts: 17914
Re: First startup ... Pls Help!
«
Reply #35 on:
March 27, 2022, 07:19:28 AM »
Quote from: mlineHK on March 27, 2022, 07:05:16 AM
Thank you Paul will try to replace them.
It, you definitely don't want/need to replace the working one.
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
mlineHK
Jr. Member
Posts: 30
Re: First startup ... Pls Help!
«
Reply #36 on:
March 27, 2022, 07:34:16 AM »
Yes will replace the a side one.
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mlineHK
Jr. Member
Posts: 30
Re: First startup ... Pls Help!
«
Reply #37 on:
April 04, 2022, 07:25:33 PM »
hi Paul,
after replacing the A side LM431ACZ , the results remain unchanged. what do u suggest I shall do next?
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Paul Birkeland
Global Moderator
Hero Member
Posts: 17914
Re: First startup ... Pls Help!
«
Reply #38 on:
April 05, 2022, 04:23:46 AM »
Have you reflowed all of the solder joints in the amp?
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
mlineHK
Jr. Member
Posts: 30
Re: First startup ... Pls Help!
«
Reply #39 on:
April 05, 2022, 04:47:24 AM »
All joints on 3 boards only.
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Paul Birkeland
Global Moderator
Hero Member
Posts: 17914
Re: First startup ... Pls Help!
«
Reply #40 on:
April 05, 2022, 05:10:03 AM »
I would go over the 12AU7 socket and associated terminal strips as well.
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
mlineHK
Jr. Member
Posts: 30
Re: First startup ... Pls Help!
«
Reply #41 on:
April 05, 2022, 05:15:10 AM »
ok will do thanks.
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