Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: Mr. Electric Wizard on April 25, 2020, 08:52:01 AM

Title: Speedball resisitance/voltage check (question)
Post by: Mr. Electric Wizard 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?

Title: Re: Speedball resisitance check OB/OA - infinity?
Post by: Mr. Electric Wizard 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?

Title: Re: Speedball resisitance/voltage check (question)
Post by: Paul Birkeland 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.

Title: Re: Speedball resisitance/voltage check (question)
Post by: Mr. Electric Wizard on April 25, 2020, 11:18:07 AM

The speedball made me realize how utterly old my eyes are.   ;D
Thanks PB!

Title: Re: Speedball resisitance/voltage check (question)
Post by: Mr. Electric Wizard 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.

Title: Re: Speedball resisitance/voltage check (question)
Post by: Paul Birkeland on April 27, 2020, 08:50:15 AM

No.

Title: Re: Speedball resisitance/voltage check (question)
Post by: Mr. Electric Wizard 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!