Speedball resisitance/voltage check (question)

Mr. Electric Wizard · 1898

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Offline Mr. Electric Wizard

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on: April 25, 2020, 08:52:01 AM
Hey there!
I wanted to check with you guys (since you've been so great) before I powered on my Crack (with Speedball).
When I test the resistance on OB/OA I am getting an out of range reading.
In the manual it says that some meters can't read resistances this high.  I think this is the deal with mine.
Do you think it's okay to proceed to the voltage reading stage?
« Last Edit: April 25, 2020, 09:18:09 AM by Mr. Electric Wizard »



Offline Mr. Electric Wizard

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Reply #1 on: April 25, 2020, 09:17:43 AM
I felt good enough about the infinite resistance to power on and move onto the voltage checks.
No smoke or anything, and all LED's are lit up.

Here are my voltages:
OA - 114.4 V
OB - 113.7 V
G   - 0.6 mv 
B+ - 185.3 V

OA/OB are quite a bit higher than 100V.
Are all of these readings acceptable?



Offline Paul Birkeland

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Reply #2 on: April 25, 2020, 09:48:01 AM
Out of range is good for OA/OB on the big PC board.

You will probably find that your OA/OB voltages on the small board are a little on the high side, and that can drive up the voltages on OA/OB on the big board.  Also the larger the difference between OA/OB on the big and small boards, the stronger your 6080 is.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline Mr. Electric Wizard

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Reply #3 on: April 25, 2020, 11:18:07 AM
The speedball made me realize how utterly old my eyes are.   ;D
Thanks PB!



Offline Mr. Electric Wizard

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Reply #4 on: April 27, 2020, 08:48:50 AM
So, you don't think the OA/OB on the large board being 113/114 is a show stopper?
Technically, this is 13-14% over the max value called out for these pins.



Offline Paul Birkeland

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Reply #5 on: April 27, 2020, 08:50:15 AM
No.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline Mr. Electric Wizard

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Reply #6 on: April 27, 2020, 09:24:14 AM
Thanks again for all your help.
Waiting for my wood case poly to dry then I'll be rocking!