Diode replacement in Revox A77 tape recorder

bram9206 · Feb 27, 2017

Hi all,

I'm currently revising an old Revox A77 mk3 reel to reel tape recorder and I need to replace two shorted diodes. According to the manual specs are:

- D121 Si-diode PAB212 50V - 200mA - 70°
- D124 Si-diode BA127 50V - 100mA - 70°

Anyone knows what contemporary diodes I can use to replace the old ones?

Thanks!

abbey road d enfer · Feb 27, 2017

1N4002/3/4/5, whichever is convenient.

ruffrecords · Feb 28, 2017

Are these diodes in the power supply or the signal circuitry?

Cheers

Ian

abbey road d enfer · Feb 28, 2017

They are in the relay-based transport logic.
It's 27V and the current is the relay current, so a few 100mA max. Some of these are used as transient suppressors, so a rating of at least 100V seems to be adequate.

RuudNL · Feb 28, 2017

Yes, as abbey road d enfer mentioned, any 1N400x will do.

Diode replacement in Revox A77 tape recorder

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Diode replacement in Revox A77 tape recorder

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