Reply To: Philco 37-650 Plate voltage

[Rick D]

Hi Jean
When I first started befor I changed some of the resistors the plate voltage was
around 358 volts and now it stays around 275 to 285 ,at times after running for
a while it may be a few volts down from when I first started,I ran it seven nights
for about 4 hours non stop each time checking the voltage at the start and the finish
and also in between,very little change.Now for the bad news,two nights ago it made
a crackling noise and slowly quit,I was sick all that work,I had to leave it for a
few days,tonight I checked the voltage on all tubes,I found on the 6J5 tube no
plate voltage so I checked on my service data sheet,it has no voltage listed
for the 6J5 tube ,is there no plate voltage on that 6J5 tube ?.And to my
surprise while checking the 6J5 tube the set came back to life,a low crackling
noise but working,but still no voltage on the plate of that tube.I did not
run it more than a minute at a time because it still had a bit of low crackling
noise and I was afraid it would die and never start again.What I did was start
it and with a wooden prob tapped every joint and moved ever wire ,but found
nothing loose or a bad solder joint.I am not moving it I will leave it
on it,s end until I find the problem,Jean do you have any ideas where
I should look,I have sanded the tube pins put a small round file
down each pin hole in the tube base and used a tooth pick with
deoxit to clean the hole,anything else you could think of, I would be
happy to try and very thankful,wow this set has really given me
a hard ride,thanks in advance for any help all the very best Rick