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Vintage Transistor Substitution Help

A

ampman

AK Subscriber
Subscriber
Hi,


Need help with a problem fixing vintage units.

Attempting to source replacement BJT transistors for a couple Pioneer pieces. Running into stumbling blocks and am wondering, first, if there is a quality information source for substitutions? I've spent a couple of hours looking and am finally climbing out of the rabbit hole. Can't decide which suppliers to believe.

Secondly, what are the trusted sources for parts. Understand Digi-key and Mouser are good for most parts so am wondering if there are go-to sources for other harder to find items?

In particular - the 2SA1100 (2SA733A), & the 2SK34(2SK30A)
Thanks.
 
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I'm curious about what caused these transistors to fail. And what can be done to keep it from happening again?

Thanks!
 
2SA733A is a general small signal transistor. I always use 2SA970 in its place. I've never come across a 2SA1100 but same thing.

I've never had a 2SK30 fail but if it does, BF245A is a fine replacement. Check pinout though. For both types there are many many many replacements. Any transistor with same ballpark parameters will work as replacement. Always check pinout.
 
PE9ZZ said:
2SA733A is a general small signal transistor. I always use 2SA970 in its place. I've never come across a 2SA1100 but same thing.

I've never had a 2SK30 fail but if it does, BF245A is a fine replacement. Check pinout though. For both types there are many many many replacements. Any transistor with same ballpark parameters will work as replacement. Always check pinout.
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Hi,
Thanks for the information. Appreciate your help.

None of the devices appear to be available. onsemi did produce them but are currently shown as obsolete (Mouser and Digi-key) and no suggestions for replacements. The onsemi site does list them but does not have direct subs.

Further investigation show one source: Anyone know about this source

2SA970 PNP Audio Amplifier Transistor

2SA970 Transistor, 2SA970 PNP General Purpose Transistor for Audio Amplifiers. Buy 2SA970 Transistor.
www.futurlec.com

Thanks.
 
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