Zener diode on Altec 1593B amp

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Hi.

I'm restoring an Altec 1593B amplifier. It has a transformer coupled phase inverter. The primary is fed 15v from a zener voltage regulator. Someone stuck an old germanium diode in place of the zener :confused:. The service manual only says "Diode, 15V +/-5%". Any idea of the dissipation would be? Since it's feeding the phase inverter transformer, I'm assuming it's low current. Can I just use a large zener (1W or 5W)?

Thanks
Elias
 
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