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Old 21st July 2008, 03:27 PM   #1
hieuats is offline hieuats  Viet Nam
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Default Equivalent Transistor

Hello everybody,

This is my story.

I bought a vintage heath kit AA-22 SS Amp few months ago. It has 2 RCA transistors for one channel (2N2147). But now, all power transistors were dead.

I would like to replace them with other equivalent Transistor of Motorola.

Pls show me what type is the best.

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Old 21st July 2008, 06:21 PM   #2
lineup is offline lineup  Sweden
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Location: the north
2N2147 2N1073 find 2N1073 datasheet
2N2147 2N1073A find 2N1073A datasheet
2N2147 2N1073B find 2N1073B datasheet
2N2147 2N1541 find 2N1541 datasheet
2N2147 2N1546 find 2N1546 datasheet
2N2147 2N1906 find 2N1906 datasheet
2N2147 2N3617 find 2N3617 datasheet
2N2147 2N3617..18 find 2N3617..18 datasheet
I guess some of those similar in the list will be right for you.
Here is the link for you:

Lineup regards
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Old 22nd July 2008, 12:46 AM   #3
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this looks like a power inverter circuit because some of the wires seem to be cross connected to windings on the transformer. if it is, you only need to re-bias the base winding for 0.7 volts instead of 0.3 volts, and replace the transistors with silicon PNPs, and the 1N23 diodes with 1N4002 diodes. even if it's an amp, unless you're trying to preserve historical accuracy here, i would do the same thing, go to silicon devices.
Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net
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Old 22nd July 2008, 02:46 AM   #4
hieuats is offline hieuats  Viet Nam
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@ Lineup, Unclejed613,

Thank you for your help very much!

I will try to wake up my amplifier.

Best regards.
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Old 29th May 2010, 05:53 PM   #5
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Location: D-55629 Schwarzerden
I try to find out to the most vintage transistors the associated amplifier models. Perhaps also of interest for you - go to
Overview of Brands and Models from first Solid State Audio Amplifier Components want.

BTW - how is the sound of your amplifier? Your model is listet by post #36 and #44 from above link.
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