• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Phillips FX737A Rectifier


2010-01-17 11:12 am
Dear Friends,

I use to work on Valve Amps quite a long time ago, but I am out of touch now, A friend brought a vintage Phillips FX737A radiogram which is totally dead and asked me to fix it. I checked and found that both the power and output transformers are OK but both the rectifier EZ80 tubes and the filter capacitor(50uf + 50uf, 400V) have shorted. These tubes and capacitor are totally obsolete locally, even though they are scarcely available on the net. I need some advice from you all on how I can replace these tubes with diodes, and which diodes to use. Can I replace this capacitor with 2 metal film capacitors of the same rating. Pls advice.