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Old 1st Jun 2019, 3:09 pm   #1
Malcolm T
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Default VHF UHF TV set for home brewing gear

I have acquired a VHF UHF TV set from the dump with glorious valves !!!
Ive only had a brief look after a clean up and i have already two valves for
use , a BY88 and a PL500 , havnt had a chance to look at the others yet and as for their ultimate condition ie are they still in good vacuum shape well who knows depending on what else is in there i,m leaning toward something radio RF based either HF or VHF
Or something audio with low voltage HT


Sometimes the local dump is a gold mine !

Any ideas anyone
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Old 1st Jun 2019, 3:17 pm   #2
Nuvistor
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Default Re: VHF UHF TV set for home brewing gear

BY88? Probably PY88.
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Old 1st Jun 2019, 3:23 pm   #3
julie_m
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Default Re: VHF UHF TV set for home brewing gear

Agreed, "BY" indicates a silicon rectifier diode!
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Old 2nd Jun 2019, 9:40 am   #4
Restoration73
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Default Re: VHF UHF TV set for home brewing gear

You should be able to recycle the valve audio stage to construct a basic amplifier.

The PL500/504/509 line output valves could be used in a grounded grid RF power
amplifier, but whatever you build you need a suitable mains transformer.
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Old 2nd Jun 2019, 10:27 pm   #5
Malcolm T
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Default Re: VHF UHF TV set for home brewing gear

Yes took a closer look it is a PY88. Covered in years of burnt on grime , i was tempted to plug it in but it might be dodgy .
Audio amp sounds like a nice project. its a shame to take it apart but it has defiantly seen better days .
A case of seeing whats salvageable and then going from there , caps a probably done for .
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