02-05-2015, 10:33 PM
OK.
The coils all fixed.
No short in the load.
Now.
First no sound at all. Suspected the speaker.
Then upon reinserting detector tube heard the buzz when touching the grid.
Then with the screwdriver touching det grid heard reception. Weak.
Touching the previous tube gives even weaker one.
Antenna gives zero.
Well, it is a progress, good high voltage and some life.
Now. I supect part of the problem is the fild coil, might not drop enough and the output plate voltage is 340V whereas should be 225V. Could screw things up.
Even adjusted for a DMM reading it is too high.
Will try some gimmicks....
PS. Kirk, were you able to measure field resistance on your speaker?
P.P.S. Adding 2.2K in series with the FC took extra 30V from the output pate but did not improve the reception.
The coils all fixed.
No short in the load.
Now.
First no sound at all. Suspected the speaker.
Then upon reinserting detector tube heard the buzz when touching the grid.
Then with the screwdriver touching det grid heard reception. Weak.
Touching the previous tube gives even weaker one.
Antenna gives zero.
Well, it is a progress, good high voltage and some life.
Now. I supect part of the problem is the fild coil, might not drop enough and the output plate voltage is 340V whereas should be 225V. Could screw things up.
Even adjusted for a DMM reading it is too high.
Will try some gimmicks....
PS. Kirk, were you able to measure field resistance on your speaker?
P.P.S. Adding 2.2K in series with the FC took extra 30V from the output pate but did not improve the reception.