Resistance Issues on B side [resolved]

snoozzell · 525

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Offline snoozzell

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on: June 01, 2021, 11:05:55 AM
I finished my first build and resistances 1-15 check out as expected.  However, I'm getting a lot of strange resistance readings on the B side.  They are as follows.

15: 0 ohm
16: 0.703 Mohm
17: 1.03 Mohm
18: 1.53 Mohm
19: 1.05 Mohm
20: 1.3 Mohm
21: 1.1 Mohm
22: 0 ohm
23: 0 ohm
24: 0.75 Mohm
25: 1.1 Mohm
26: 0 ohm
27: 1.1 Mohm
28: 0 ohm
29: OL
30: 160 ohm
31: 160 ohm
32: 2.3 Mohm
33: 1.7 Mohm
34: 0.7 Mohm
35: 1.1 Mohm
36: 0 ohm

I've looked it over a few times and compared with the correct side but nothing is standing out as an obvious mistake or bad connection. 

Do those readings point to an issue in a specific area?  Thanks a lot for any help you can provide and just let me know if I should take pictures or any other readings.
« Last Edit: June 01, 2021, 02:36:12 PM by Paul Birkeland »



Offline Paul Birkeland

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Reply #1 on: June 01, 2021, 11:11:11 AM
19, 23, and 26 are all wired together with black wire.  You have that connection at 23 and 26, but not 19, ergo you are missing the black wire going to 19 or it's loose.  I would focus on this issue first and foremost and definitely don't power up the amp until this is resolved and the cause 100% understood.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline snoozzell

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Reply #2 on: June 01, 2021, 11:32:34 AM
oh yep, it looks like the solder joint in 26L had 2 of the wires well contained but the third didn't join.

Now I'm getting the correct readings across the board.  Thanks a ton for the quick response!