Hum Pot adjustments [resolved]

ArtnShit · 4702

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Offline ArtnShit

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Reply #30 on: February 24, 2022, 08:35:43 AM
When I am checking the voltage of these pins and terminals is the blackprobe staying on the RCA grounding source? or is it moving to other areas? WHat do you mean move the black probe?

a&s


Offline Paul Birkeland

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Reply #31 on: February 24, 2022, 09:36:35 AM
The black probe can stay on the RCA ground until you measure the last AC voltage at the output transformer.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline ArtnShit

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Reply #32 on: February 24, 2022, 01:45:12 PM
Here are the measurements:
B3 and RCA ground = 5.8V AC
Terminals 5 and 10 = 21.34 AC

Sounds normal, right?

a&s


Offline Paul Birkeland

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Reply #33 on: February 24, 2022, 01:46:15 PM
Now measure the AC voltage across the speaker jacks.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline ArtnShit

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Reply #34 on: February 24, 2022, 01:52:12 PM
 Between the two output jacks, it's 1.133V AC

a&s


Offline ArtnShit

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Reply #35 on: February 24, 2022, 02:23:50 PM
If that is a correct measurement would it make sense to assume that the problem could be stemming from the Beepre? I tried playing both the Beepre and Kaiju for the first time in the same go.

a&s


Offline Paul Birkeland

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Reply #36 on: February 24, 2022, 03:26:53 PM
1.133V AC is audible signal coming out of the speaker jacks. This confirms that the amp is working.  I would hook it back up and have a listen. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline ArtnShit

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Reply #37 on: February 24, 2022, 03:40:53 PM
No right channel still. So we can assume the Kaiju is fine? Other thing is a BeePre2 I built right before the Kaiju.

a&s


Offline kgoss

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Reply #38 on: February 24, 2022, 03:51:08 PM
Try swapping cables from the beepre 2. If the problem switches sides the amp is good and you need to focus on the cables or preamp.

Ken Goss


Offline ArtnShit

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Reply #39 on: February 24, 2022, 03:57:57 PM
Swapped the cables, the problem still persists.

Thanks for the recommendation, though! I appreciate it.

a&s


Offline Paul Birkeland

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Reply #40 on: February 24, 2022, 04:16:55 PM
Play the 60Hz tone into the Kaiju hooked up to your speakers and measure the AC voltage between the speaker binding posts.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline ArtnShit

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Reply #41 on: February 24, 2022, 04:32:08 PM
Played the tone directly from the 1/8 to RCA into the kaiju, bypassing preamp. I could hear it out of the speaker fine.

Voltage was .305V w 60hz tone.

a&s


Offline Paul Birkeland

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Reply #42 on: February 24, 2022, 05:11:05 PM
Now feed the tone into the BeePre and hook it up to the Kaiju.


Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline ArtnShit

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Reply #43 on: February 24, 2022, 05:31:38 PM
I am getting nothing. Voltage says 0.

I am also no longer getting any sound out of the left channel from the Kaiju either from directly playing the tone thru 1/8-RCA into Kaiju or from BeePre to Kaiju. Both of those were working an hour ago.

a&s


Offline Paul Birkeland

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Reply #44 on: February 24, 2022, 05:33:16 PM
Now that you have lost the channel, I would restart the checks you just completed.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man