[TMC] GPR90

[sebdesn]

John,
 Well here is the latest,but still not good news on this beaste...
I did have a new tube in v4.

Changed R24 (the 150 or 180 ohm) to 250 ohm.(went lower and higher and didnt
work)

Changed R25 (15K) to 75K.(the original 15k is in the can and someone cut it
loose, and put a 150k outside the can that I changed to 75k).

Changed R23 (47 ohm) to 10 ohm.(went to 30 and 23 with no effect)
Aligned  T2 per the instructions

(A)If I get the oscilator playing, and set L19 so it keeps playing for a
couple hours,and is in the middle of the range, It won't start up after
sitting overnite.

(B)If I get L19 set so it starts in the morning, after sitting overnight, it
quits after 15 or 20 minutes.

  If it wont start after A or B , the only way I can get it to start is to
pull v4 while its on,and plug it in again.It wont start by adjusting L19,
which seems strange,like something else is kaput..

   I pulled the cover off of L19 and looked at the two caps (120 and 220).
The 220 is a rectangular squaresided  silver mica tub type unit.
The 120 is one of those tubular jobs that looks like a 1/2 watt resistor and
looks like its some sort of sandy composition stuff.
Since the circuit seems to be changing with temperature, do you think it
would be reasonable to change the 120 cap in the can, or would something
else cause the thing to change that much????
I can't see anything else except the two capacitors and the tube that would
change with temp.
I am totaly lost at this point...

John,I appreciate your help very much,as I seem to be over my head in this
project.
73,de Bud WØHG