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Transonic 200 Output Transistors?
Posted: Mon Feb 15, 2021 11:12 am
by MBFab1
Hello!
I'm new to this board - great resource! I'm in the process of repairing a Transonic 200 with one blown output transistor. The original house-numbered Motorola devices are impossible to find. Any suggestions for replacements for both the NPN and PNP devices? I'm going to replace all of them and match up the paralleled pairs as well.
Thanks in advance for any help you can provide.
Mike
Re: Transonic 200 Output Transistors?
Posted: Tue Feb 16, 2021 7:33 am
by espidog
Is it possible to get hold of spec sheets for the Motorola transistors? That's the only way I can think of that's going to enable you to source any kind of equivalents.
By "house numbered", I take it you mean that these transistors have Rickenbacker-specific part numbers on them, not Motorola ones, yes? If so, that's a tough call. A bit of a long shot, but I wonder if might be worth contacting Motorola and asking if they have any records of what transistors they supplied to Rickenbacker for these amps?
Re: Transonic 200 Output Transistors?
Posted: Tue Feb 16, 2021 9:08 am
by jps
MBFab1 wrote:The original house-numbered Motorola devices are impossible to find.
Mike
Please post good sharp, clear photos of these transistors (overall and close ups, from top, bottom and various angles) with the "house numbers" clearly legible, thanks.
Re: Transonic 200 Output Transistors?
Posted: Wed Feb 17, 2021 9:55 am
by MBFab1
Thanks for the responses! Yes, these transistors have a Rickenbacker-specific part number that I've been unable to cross reference to standard Motorola parts. The PNP part is SJ3564 and the NPN is SJ3565. Photos of both are attached.
Thanks for any help you can provide.
Mike
Re: Transonic 200 Output Transistors?
Posted: Wed Feb 17, 2021 12:19 pm
by jps
I know someone on another forum who may be able to provide some guidance. When I can, I will post these and see what he may have to say as to substitutes.
Re: Transonic 200 Output Transistors?
Posted: Wed Feb 17, 2021 12:33 pm
by espidog
Following this with interest...
Re: Transonic 200 Output Transistors?
Posted: Wed Feb 17, 2021 11:02 pm
by jps
Try these cross-referenced transistors.
MJ15003 and MJ15004
I got this information from the mouth of an aged horse.
Re: Transonic 200 Output Transistors?
Posted: Thu Feb 18, 2021 3:36 am
by jps
Re: Transonic 200 Output Transistors?
Posted: Thu Feb 18, 2021 11:48 am
by MBFab1
Great! Thanks so much for your help with this...
I'll let you know how it turns out.
Mike