View Single Post
  #241  
Old 18-02-20, 16:10
David Dunlop David Dunlop is offline
Registered User
 
Join Date: Feb 2006
Location: Winnipeg, MB
Posts: 3,384
Default

An interesting development over the weekend.

I completed the required Voltage and Resistance tests on the Remote Receiver, which have provided some interesting information. I also finally pulled all the valves from the Remote Receiver to run them through the tester.

You may recall that at the time I acquired the three 52-Set receivers, I had no means of testing the British based ARP-3 and 12Y4G valves, so simply cleaned and visually inspected them all, cleaned the sockets and put each valve back where it came from.

So now the ones in the Remote Receiver all came out again and each was given an ID tag. Of the eight ARP-3’s in the receiver, the V1C (Mixer) was totally dead and another, the V1G ( 1st AF Amp), was so weak as to be useless, so both were replaced by good ones from my parts receiver.

The real surprise was the two 12Y4G’s on board. Both V2A (Detector/AVC) and V2B (Noise Limiter) were completely dead on both sides internally. Not even the slightest glow in the dark from either after 20 minutes of receiver warm up. When I pulled the easily accessed 12Y4G from the parts receiver, it too was completely dead on both sides.

That seems like an extremely high failure rate for a valve and it has now got me wondering what kind of a reliability record these 12Y4G’s had in service use.

David
Reply With Quote