Speedball Help

[Paul Birkeland]

Next I would double check the "I" and "O" pad wiring.  The "I" pad should be fed from T2 or T4, the "O" pads on each board will go to T1 or T5.  Swapping these can cause some issues.

[Blkout]

Next I would double check the "I" and "O" pad wiring.  The "I" pad should be fed from T2 or T4, the "O" pads on each board will go to T1 or T5.  Swapping these can cause some issues.

Check and check, all 4 are correct.

[Paul Birkeland]

Try reheating the center leg of the MJE-350 on the offending board.  Put your soldering iron tip on both the center leg and the PCB at the same time, then count to ten.

-PB

[Blkout]

Try reheating the center leg of the MJE-350 on the offending board.  Put your soldering iron tip on both the center leg and the PCB at the same time, then count to ten.

-PB

Thanks Paul but no-go. I'm pretty sure the center leg is soldered well, there's just a dab of solder coming through the board on the top side touching the middle leg. If I may ask, would this offending "A" board also be the problem with my voltages reading so high at the tube terminals too?

[Paul Birkeland]

You can try swapping the small PC boards side to side to see if the high voltage follows a board (I suspect it will).

-PB

[Blkout]

You can try swapping the small PC boards side to side to see if the high voltage follows a board (I suspect it will).

-PB

Paul I appreciate all of your help, at this point I've decided to send the amp to you guys for repair. I'm not upset about paying the $125 fee but I'm disappointed that I wasn't able to resolve this issue since it would have been a great feeling to resolve the issue myself. I use to repair military electronic equipment about 17 years ago but my troubleshooting skills are quite rusty these days and about all I can do anymore is solder with reasonable ability. I'm not even sure at this point if I may have a defective component but I'm sure it will take you a lot less time than me to identify the problem.

Thanks again for your time though. You guys should be seeing my amp soon.

[Blkout]

If it matters, the resistance checks fail at T7, T9, B3, B6, all are supposed to be 2.9K Ohms, I'm getting over 2M Ohms and it continues to climb.

[Paul Birkeland]

If it matters, the resistance checks fail at T7, T9, B3, B6, all are supposed to be 2.9K Ohms, I'm getting over 2M Ohms and it continues to climb.

The resistance checks change pretty significantly with the Speedball installation.

-PB

[Blkout]

The resistance checks change pretty significantly with the Speedball installation.

-PB

Ahh ok then, that explains why there's no resistance checks after the speedball upgrade.