If I unplug it terrible buzz stops and I can hear station perfectly clear for about a half second till tubes cool.
I have performed the resistance check by the manual on all pins of all tubes and find resistance on all are
right on or within 10% tolerance.
Same goes for the voltage checks on all tubes and pins.
Traded out all tubes, still the same, about to trash can this radio.....Help!
:If I unplug it terrible buzz stops and I can hear station perfectly clear for about a half second till tubes cool.
:I have performed the resistance check by the manual on all pins of all tubes and find resistance on all are
:right on or within 10% tolerance.
:Same goes for the voltage checks on all tubes and pins.
:Traded out all tubes, still the same, about to trash can this radio.....Help!
Antoni,
Have you checked the capacitors? Sounds like one of the filter caps has gone bad. I have seen this same symptom in other radios where the buzz goes away as the capacitor discharges.
Jim.
Are there any light dimmers, cellphone chargers, computers, fluorescent lights, wireless networking devices or other electronics nearby?
Radiodoc
*************
::Has terrible buzz, but I can tell that there is a station in the background,
::If I unplug it terrible buzz stops and I can hear station perfectly clear for about a half second till tubes cool.
::I have performed the resistance check by the manual on all pins of all tubes and find resistance on all are
::right on or within 10% tolerance.
::Same goes for the voltage checks on all tubes and pins.
::Traded out all tubes, still the same, about to trash can this radio.....Help!
:
:Antoni,
:Have you checked the capacitors? Sounds like one of the filter caps has gone bad. I have seen this same symptom in other radios where the buzz goes away as the capacitor discharges.
:Jim.
::If I unplug it terrible buzz stops and I can hear station perfectly clear for about a half second till tubes cool.
::I have performed the resistance check by the manual on all pins of all tubes and find resistance on all are
::right on or within 10% tolerance.
::Same goes for the voltage checks on all tubes and pins.
::Traded out all tubes, still the same, about to trash can this radio.....Help!
:
:Antoni,
:Have you checked the capacitors? Sounds like one of the filter caps has gone bad. I have seen this same symptom in other radios where the buzz goes away as the capacitor discharges.
:Jim.
:If I unplug it terrible buzz stops and I can hear station perfectly clear for about a half second till tubes cool.
:I have performed the resistance check by the manual on all pins of all tubes and find resistance on all are
:right on or within 10% tolerance.
:Same goes for the voltage checks on all tubes and pins.
:Traded out all tubes, still the same, about to trash can this radio.....Help!
I second the motion…. as per Sir Jim..
My “munney” is on the input section of the card-board-i-fied eee-lectro-my-fo-ly-tic located under chassis.
The ‘talking underwater” modulation effect is typically attributable to two things, a moderate version can be had from a front end LOOP antenna connection to ground / AVC buss being open.
With your set not incorporating a loop with its multi band antenna coils being condensed to forms…thats out.
Now with your troubleshooting already enacted…just “THIMK” about it… the incoming AC getting converted to quasi pulsating DC, with the filter not performing adequately sufficient filtering…...HOWEVER …there is some degree of DC being produced.
When you unplug the AC power…...BAMMMM….. the AC element , responsible for the hum is GONE….and the set then tapers off in its use of what pure DC that was left stored in the somewhat deficient filtering section(s).
73's de Edd