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.
Thanks
Carlos
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.
Thanks
Carlos
I think you could sub an EZ81 for the EZ80. Leave the old cap in place (but disconnected) and replace with two caps under chassis.
EZ80's appear on ebay fairly frequently. High voltage caps are still made. I think JJ still do a 50+50uF, and there are UK stockists.
The JJ 50+50uF / 500V is also available from BTB Elektronik, the distributor I mentioned above.
See: BTB Elektronik-Vertriebs GmbH - Neuheiten
Approx. costs to UK are: 11-12€ for the EZ80, 7€ for the cap, 15€ shipping.
Rundmaus
See: BTB Elektronik-Vertriebs GmbH - Neuheiten
Approx. costs to UK are: 11-12€ for the EZ80, 7€ for the cap, 15€ shipping.
Rundmaus
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