Voltage Check

cnledesma17 · 14308

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Offline cnledesma17

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on: January 01, 2024, 02:30:21 PM
Hello,

I recently completed my Stereomour II Kit, and while performing the final voltage check, I noticed that the T7 and T14 DCV were both reading ~110 VDC and ~100 VDC, which failed to meet the recommended range. All LEDs illuminate on the circuit board. I tried swapping the tubes around and reheated any suspected cold joints with no improvement. I am at a point where I am not sure what to do. All resistances and other voltages are within the range.


Thank you,



Online Paul Birkeland

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Reply #1 on: January 01, 2024, 03:53:42 PM
How did the resistance checks go?  How are the resistances at terminals 10 and 11?  I would not assume that there's anything wrong with the C4S board at the moment.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline cnledesma17

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Reply #2 on: January 01, 2024, 05:11:24 PM
Hello,

The resistance checks were all within spec. At terminal 10 it was 14k and at terminal 11 it was 16k.


Online Paul Birkeland

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Reply #3 on: January 02, 2024, 05:47:31 AM
You will have to carefully measure the DC voltage at the outside of each of the 365 ohm brown Dale resistors on the 9 pin sockets to see what's appearing there.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline hmbscott

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Reply #4 on: January 02, 2024, 07:37:29 AM
It looks like the resistor value that should be 365R is marked 31R6F (31.6 ohm?). Could that be the problem? I have attached a zoom-in on your IMG_2387.

Scott
[Ortofon 2M Bronze > U-Turn Theory > Eros II] & [iMac via USB > Denafrips Ares 2] >> Moreplay >> Schiit Lokius EQ >> Stereomour II >> Hsu ULS-15 Sub >> homemade DML Speakers
Moreplay 2nd out >> [Crack + Speedball > HD 650]

Online Paul Birkeland

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Reply #5 on: January 02, 2024, 08:25:19 AM
That is not the correct part, and will cause the exact issue you're having.  If you shoot an e-mail to the replacementparts(At)bottlehead(dot)com e-mail, we can send the correct resistors to you.

-PB
« Last Edit: January 02, 2024, 08:34:58 AM by Paul Birkeland »

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Sniffy

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Reply #6 on: January 06, 2024, 12:41:34 PM
Thank you for posting the photos.  I was stalled at the voltage check step since I had no idea how to turn over the chassis without damaging the tubes.  The "box method" you have illustrated helps a lot!


Offline cnledesma17

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Reply #7 on: January 27, 2024, 09:26:08 AM
Hello,

Thank you for taking the time to help me solve my problem. I will be reaching out soon for the replacement parts.


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