VHF UHF TV set for home brewing gear - UK Vintage Radio Repair and Restoration Discussion Forum

Malcolm T · 1st Jun 2019, 3:09 pm

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

Nuvistor · 1st Jun 2019, 3:17 pm

BY88? Probably PY88.

julie_m · 1st Jun 2019, 3:23 pm

Agreed, "BY" indicates a silicon rectifier diode!

Restoration73 · 2nd Jun 2019, 9:40 am

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.

Malcolm T · 2nd Jun 2019, 10:27 pm

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 .

1st Jun 2019, 3:09 pm	#1
Malcolm T Hexode Join Date: Dec 2018 Location: Lugo, Spain Posts: 483	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

1st Jun 2019, 3:17 pm	#2
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,431	Re: VHF UHF TV set for home brewing gear BY88? Probably PY88. __________________ Frank

1st Jun 2019, 3:23 pm	#3
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: VHF UHF TV set for home brewing gear Agreed, "BY" indicates a silicon rectifier diode! __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.

2nd Jun 2019, 9:40 am	#4
Restoration73 Nonode Join Date: Jun 2013 Location: Surbiton, SW London, UK. Posts: 2,801	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.

2nd Jun 2019, 10:27 pm	#5
Malcolm T Hexode Join Date: Dec 2018 Location: Lugo, Spain Posts: 483	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 .