new member from melbourne
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Location: Melbourne, VIC
Member since 21 January 2025
Member #: 2702
Postcount: 47
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Hello,
I was recently handed an AWA Fisk Radiola valve radio to get working for a relative. My degree (many years ago!) was in solid state electronics, with no valve content at all. About 15 years ago I built a copy of a Fender Princeton 5W guitar amplifier from scratch. It works very well, but it is my only experience with valves. Valve radios are still a mystery. I'll post in the Tech forum with details of the radio and some questions shortly.
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Location: Toongabbie, NSW
Member since 19 November 2015
Member #: 1828
Postcount: 1334
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This site has a lot of 'Fisk Radiola' content, Jack.
Go to the 'search forums' tab and select all with 'fisk radiola' as the search subject.
Lots of people have been there before you!
Cheers, Fred.
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Location: Belrose, NSW
Member since 31 December 2015
Member #: 1844
Postcount: 2527
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You learnt about FETs?
A valve is a FET in a bottle! Just higher voltages and a heater. And some funny extra grids....
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Location: Melbourne, VIC
Member since 21 January 2025
Member #: 2702
Postcount: 47
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Fred,
Thanks, I've had a quick look at the other Fisk Radiola threads. This one is a bit of a mongrel. It was originally a battery powered model (a four valve model 86X or Z I think), but has been modified to run on 240V. It now has 5 valves. I don't have a circuit diagram, because I don't know what upgrade was done to it. A Google search tells me the five valves in my set were used in a Southern Cross Radio Pty Ltd Model CDR5/2 radio. Perhaps it's based on that design? I don't think it's an AWA design any more.
It's a horrible mess inside. Really awful soldering. Rats have eaten some of the wax caps. It was tripping the RCD in the owner's house. I discovered the neutral and earth were swapped in the old bakelite plug. I fitted a new lead and got it to work intermittently. I've cleaned it up and repaired the torn speaker cone. Next job is to replace all electrolytic and wax caps. New caps are on the way from Mouser.
Ian,
Yes I know a little about FETs. It's the grids that confuse the issue!
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Location: Hill Top, NSW
Member since 18 September 2015
Member #: 1801
Postcount: 2116
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Location: Melbourne, VIC
Member since 21 January 2025
Member #: 2702
Postcount: 47
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