Pye W15 AM - UK Vintage Radio Repair and Restoration Discussion Forum

TALKINGWITHPYE · 14th Sep 2020, 8:47 am

Hello all, I have just seen among a thread about the PYE vr 200 mention of the failure of the W15 AM modulation transformer. I had quite a few of theese transformers fail in my time, the easiest way to diagnose this was to monitor the current drawn from the bench supply. Key the transmitter and whistle into the microphone, if the current leaps to high values then the modulation transformer has gone shorted turns.

Dave

Jon_G4MDC · 14th Sep 2020, 9:15 am

Thanks for that useful tip.

If I can find the one that appeared to be giving problems with mod I must try that test.
I'm pretty sure I have another transformer for swaps somewhere.

14th Sep 2020, 8:47 am	#1
TALKINGWITHPYE Pentode Join Date: Oct 2018 Location: Carrickfergus, County Antrim, Northern Ireland, UK. Posts: 126	Pye W15 AM Hello all, I have just seen among a thread about the PYE vr 200 mention of the failure of the W15 AM modulation transformer. I had quite a few of theese transformers fail in my time, the easiest way to diagnose this was to monitor the current drawn from the bench supply. Key the transmitter and whistle into the microphone, if the current leaps to high values then the modulation transformer has gone shorted turns. Dave

14th Sep 2020, 9:15 am	#2
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Pye W15 AM Thanks for that useful tip. If I can find the one that appeared to be giving problems with mod I must try that test. I'm pretty sure I have another transformer for swaps somewhere.