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Phillips FX737A Rectifier
Phillips FX737A Rectifier
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Old 12th May 2013, 12:38 PM   #1
Carlosraj is offline Carlosraj  United Kingdom
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Default Phillips FX737A Rectifier

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.


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Old 12th May 2013, 01:32 PM   #2
brucetassin is offline brucetassin  United States
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Location: Loganville, GA
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.
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Old 12th May 2013, 03:55 PM   #3
Rundmaus is offline Rundmaus  Germany
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EZ80 is still available, see:

BTB Elektronik tube supplier
EZ80 @ Conrad Electronic

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Old 12th May 2013, 04:10 PM   #4
DF96 is online now DF96  England
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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.
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Old 12th May 2013, 04:12 PM   #5
Rundmaus is offline Rundmaus  Germany
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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.

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