Muffled sound after speedball upgrade

[a1171622]

Hi all,

After upgrading to speedball, I noticed there was no sound at first, just popping sound but when I turned the volume all the way up I could hear very tiny sound coming from headphones.

I checked all the transitors in their correct positions, all the connections seem fine to me.

Another thing I noticed is that I used the normal big wire (with the crack) for all of speedball upgrade by mistake, but I don't think this is the cause of the problem, is it?

Here is my voltage test result:

1. 71
2. 230
3. 0
4. 230
5. 73
6. 0
7. 220
8. 0
9. 220
10.0
11. 0
12. 0
13. 236
14. 0
15. 230
16. 0
17. 0
18. 90
19. 85
20. 0
A1. 73
A2. 0
A3. 1.5
A4. 0
A5. 0
A6 - A9. n/a
B1 70
B2 230
B3 220
B4 73
B5 230
B6 220
B7 0

Really appreciate your help!

Cheers

[Paul Birkeland]

I am very interested in seeing photos of your larger Speedball PCB.

I would strongly recommend not running the amp for too long.  If you truly have 200V at 7 and 9, something is quite wrong with the wiring, and needs to be addressed immediately.

-PB

[a1171622]

Hi PB,

I rechecked wiring and discovered that I miswired to terminal 4 instead of terminal 3.

All the voltage reading is normal now except 19 is 83, 20 is 0

I could hear a loud pop sound once on starting up and then buzzing sound from the headphones.

I checked all the capacitors and seems fine. Is there anyway that I blown up sth else from last time?

Regards

[Paul Birkeland]

I rechecked wiring and discovered that I miswired to terminal 4 instead of terminal 3.

Yikes.

All the voltage reading is normal now except 19 is 83, 20 is 0

Both the Speedball and Crack manuals that I have list no voltage for terminal 19.  They also both list 0V for 20.

I checked all the capacitors and seems fine. Is there anyway that I blown up sth else from last time?

Yes, you put 200+ V into the big Speedball PC board where it should have been grounded.  It's kind of hard to say what may have failed in the process.  I would at least order a new large PC board and associated parts.

-PB