Smashup Voltage [resolved]

1026mind · 6443

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Offline 1026mind

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on: February 16, 2022, 10:03:13 AM
I had built the smash a few years back and it worked fine, well the usual noise and microphonic. So I decided to do the smashup upgrade and to build it on two chassis , one the power source and the voltage regulators and the rest on the second chassie .
I finished the power supply but I am getting different  voltages
B1-0v
B2-212v
B3-1.847v
B4-0v
B5-212v
B6-1.847

Please help!!
Thank you!
« Last Edit: February 19, 2022, 09:59:07 AM by Paul Birkeland »



Offline Paul Birkeland

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Reply #1 on: February 16, 2022, 10:23:12 AM
I would post build photos if you can.  I haven't provided tech support on a Smash-up in some time, so a visual inspection is a good place to start. 

On the surface, I see the same issue on both sides, so it's likely that the same mistake made it onto both boards or into the build on both sides.

The 1.8V on the cathodes means the 6SN7 triodes are sucking down a ton of current.

What are your OB voltages on each PC board?  If for some reason the 4P1L tubes aren't drawing any current, that could possibly cause some of the issues you're experiencing.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline 1026mind

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Reply #2 on: February 16, 2022, 11:15:27 AM
The 4P1L are not in place, I only completed the power supply and the voltage regulators . The OB voltages are the same with B2 and B5.
« Last Edit: February 16, 2022, 11:20:45 AM by 1026mind »



Offline Paul Birkeland

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Reply #3 on: February 16, 2022, 01:00:50 PM
If you don't have the 4P1L tubes drawing the appropriate current, it won't really be possible to ascertain whether there's any issue that needs to be resolved at this juncture.


Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline 1026mind

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Reply #4 on: February 16, 2022, 01:18:20 PM
I will build the second part and go from there. Thank you very much!



Offline 1026mind

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Reply #5 on: February 19, 2022, 06:38:35 AM
I completed the second part, the voltages are:
B1 - 0V
B2 - 208.5V
B3 - 9.92V
B4 - 0V
B5 - 107.5V
B6 - 1.835V

IA - 210V Both sides
OB - 62V Both sides



Offline Paul Birkeland

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Reply #6 on: February 19, 2022, 06:57:12 AM
What are the Kreg voltages on the regulator board?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline 1026mind

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Reply #7 on: February 19, 2022, 07:02:29 AM
9.95V and 1.8V



Offline Paul Birkeland

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Reply #8 on: February 19, 2022, 07:06:11 AM
Well I would check to be sure that the Kreg cathode connections are connected to the appropriate plates at the regulator tube.  If you have plate A and cathode B hooked up to the same high voltage regulator, then you can get weird problems like this, and this is a pretty common problem with highly customized builds like this.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline 1026mind

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Reply #9 on: February 19, 2022, 07:17:29 AM
they go to B3/kreg and B6/kreg for the cathodes and B2/OB, B5/OB for the plates.
the voltages where the same in the power source for both sides before I build the second part
« Last Edit: February 19, 2022, 07:28:29 AM by 1026mind »



Offline Paul Birkeland

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Reply #10 on: February 19, 2022, 07:26:17 AM
But B2 and B3 need to go to one side of the regulator board and B5 and B6 need to go to the other.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline 1026mind

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Reply #11 on: February 19, 2022, 07:39:44 AM
They do



Offline Paul Birkeland

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Reply #12 on: February 19, 2022, 07:52:57 AM
I would next be looking for things like backwards LEDs or any transistor/431 device that has continuity between any pairs of legs.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline 1026mind

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Reply #13 on: February 19, 2022, 08:01:20 AM
The 431's are good



Offline Paul Birkeland

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Reply #14 on: February 19, 2022, 08:06:22 AM
I'm not sure what other help to offer.  Since your build deviates rather substantially from the kit we provide, the amount of help I can provide is a bit decreased. 

What jumpers did you install on the regulator board?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man