05-29-2020, 11:31 AM
Morzh. Thank you for the input and suggestions.
eCap before power up. Understood.
For my ongoing learning.
Is there proper/relatively safe method to bring the radio up on power without first replacing the eCaps?
In this case the past owner said he had turned it on a day before selling it to me and it worked but he could not tune stations. I checked the eCaps with a meter before hooking it up and they were close to spec and low ESR. I then used a variac and dim bulb tester to bring it up slowly to 115vac while watching for any indication of a short.
Is there something else I could/should have done?
I have a copy of the 84 tube datasheet that I used to identify the pins. I also looked up a second one but I do not see anywhere on these two datasheets a specification for the filtering capacitance. Could you point me to a datasheet that provides this information as it seems to be eluding me? Or is the a design chart or calculation needed to compute the value?
Regards, John
eCap before power up. Understood.
For my ongoing learning.
Is there proper/relatively safe method to bring the radio up on power without first replacing the eCaps?
In this case the past owner said he had turned it on a day before selling it to me and it worked but he could not tune stations. I checked the eCaps with a meter before hooking it up and they were close to spec and low ESR. I then used a variac and dim bulb tester to bring it up slowly to 115vac while watching for any indication of a short.
Is there something else I could/should have done?
I have a copy of the 84 tube datasheet that I used to identify the pins. I also looked up a second one but I do not see anywhere on these two datasheets a specification for the filtering capacitance. Could you point me to a datasheet that provides this information as it seems to be eluding me? Or is the a design chart or calculation needed to compute the value?
Regards, John
