Diodes used on tube socket

Applemacman · 1046

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Offline Applemacman

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on: May 15, 2021, 02:42:28 AM
Hi one of my diodes has broken off the tube socket and the lead broke while try to resolder it, was wonder if i could use a different type of diode as a replacement or do i hv to use the same ones?


Offline Paul Birkeland

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Reply #1 on: May 15, 2021, 04:57:58 AM
You can install a wire jumper between A3 and A8 instead of the second diode.

Paul "PB" Birkeland

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Offline Applemacman

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Reply #2 on: May 15, 2021, 06:27:56 AM
Do u mean leaving the one diode i hv in pace then running the jumper between a3 and a8


Offline Paul Birkeland

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Reply #3 on: May 15, 2021, 06:31:50 AM
Yes.

Paul "PB" Birkeland

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Offline Applemacman

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Reply #4 on: May 15, 2021, 06:42:01 AM
I did that and got no sound whatsoever so guessing i need to trst the voltages


Offline Applemacman

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Reply #5 on: May 15, 2021, 06:56:07 AM
I noticed the remaining diode is not lighting up


Offline Paul Birkeland

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Reply #6 on: May 15, 2021, 07:01:17 AM
You need to measure your voltages and check your resistances. If you don't do this, you don't know if your amp is working properly and you can damage your headphones or harm yourself if the amp is not functioning properly.


Paul "PB" Birkeland

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Offline Applemacman

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Reply #7 on: May 15, 2021, 07:14:01 AM
The issue is ive modified the amplifier and i just swapped out the original tube socket for a new one eveything was fine before the change of socket thats when the diode broke


Offline Paul Birkeland

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Reply #8 on: May 15, 2021, 07:15:03 AM
You need to measure your voltages and check your resistances. If you don't do this, you don't know if your amp is working properly and you can damage your headphones or harm yourself if the amp is not functioning properly.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Applemacman

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Reply #9 on: May 15, 2021, 07:17:45 AM
My point being if ive modified my amp would the resistances still be as shown in the manual


Offline Applemacman

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Reply #10 on: May 15, 2021, 07:50:12 AM
Voltages measured with amp powered on

1. 157
2. 163
3. 0
4. 163
5. 159.5
6.0
7. 157.6
8.0
9. 258.5
10. 0

Resistance measured with amp powered on

1. OL
2. OL
3. 0
4. OL
5. OL
6. 0
7. OL
8. 0.2
9.OL
12. -0.2
13. -0.2
14. -0.4
20. -0.6
22. 0.2

B3.OL
B6. OL

RCA 91.8 K
RCA 88.6 K



Offline Applemacman

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Reply #11 on: May 15, 2021, 07:51:13 AM
Sorry

9. 158.5 volts


Offline Applemacman

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Reply #12 on: May 15, 2021, 08:09:11 AM
Oh i hv the speedball board also


Offline Paul Birkeland

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Reply #13 on: May 15, 2021, 08:39:09 AM
Is the 12AU7 glowing?

What DC voltages do you get at A3 and A8?
« Last Edit: May 15, 2021, 03:51:34 PM by Paul Birkeland »

Paul "PB" Birkeland

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Offline Applemacman

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Reply #14 on: May 15, 2021, 09:00:51 AM
Yes its glowing i will check those other points tomorrow and let you know


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