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| Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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18th Oct 2008, 11:48 am
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#1 |
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Retired Dormant Member
Join Date: Sep 2008
Location: Harrogate, North Yorkshire, UK.
Posts: 352
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Home built circuits. What are they?
I am trying to identify some of my dads old radio circuits. Does anyone know what these are.
Circuit 0902 is I assume whats left of a basic receiver. Circuit 0904 & 5 is I think a short wave receiver. Valve line up is EC91 ECC82, 12AT7(MISSING),EF85, 6D2. Circuit 0906 & 7 is I think a push pull audio amp. Valve line up is EF86, 6AT6 and 2 x EL  ( also marked 3A2 near base). Transformer is a Wharfdale.
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18th Oct 2008, 10:23 pm
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#2 |
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Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
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Re: Home built circuits. What are they?
The "short wave" receiver looks more like VHF with that variable capacitor and size of coil- maybe an FM tuner?
Chris |
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18th Oct 2008, 11:27 pm
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#3 |
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Retired Dormant Member
Join Date: Sep 2008
Location: Harrogate, North Yorkshire, UK.
Posts: 352
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Re: Home built circuits. What are they?
This looks to be the case. The first valve EC91 is Triode designed for RF use at VHF. The last valve 6D2 is a double diode which I expect would make up the ratio detector.
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30th Oct 2008, 12:26 am
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#4 |
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Retired Dormant Member
Join Date: Jul 2006
Location: gloucester
Posts: 7
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Re: Home built circuits. What are they?
Looks like the first is the remains of a little AC/DC receiver, the second I would say is a VHF tuner (judging by the tuned circuit), the third one looks like a push pull output stage (EL33's ?),
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