dead notes on an Allen 202

[don60]

ive done soldering work on a pipe organ console and little bit on electronics. of course, I have no idea which is output transistor Q10 on the KBA, but sure appreciate any advice. I thinking sinking several hundred more dollars into this little MOS-1 organ with non-programmable pistons would be a mistake. A cheap DYI fix might save it fromt he landfill.

The collector of Q10 is connected directly to pin 14 of plug P5, which is located on the narrow edge of the board. I am hoping that Allen at least numbered the connector pins on your KBA.

If you want another pair of eyes on the job, send me a photo or two showing the P5 end of the board; I should be able to figure out which transistor is which.

Don

FYI, Indianajo, the MOS organs use PMOS and PNP devices on negative power supplies--no TTL or CMOS.

[moller3x]

Don,

I have the photos you requested. If you can send me an email address privately I will forward them to you. Thanks, Greg

[moller3x]

This post is nearly a year after the fact...however...I am happy to report there were two tiny transistors that were defective and with the expert help of Don60 the Allen organ was repaired for less than $30.00 and saved from the landfill. Many thanks, Don!

[don60]

Greg,

I'm glad to hear that the organ is still working. Your message made my day. Let me know if any other problems pop up.

Don