开云体育

Hello fellows I picked up a 1976 Yaesu Musen FRG-7 this year from Dan in Quebec ,this unit seems to work fine but I was always told a unit this old should have
?the electrolytic caps changed, do you fellows think they should all be changed for new ones and if I get the kit and do it will I have to do a realignment ,I have no problem?
?changing the caps but if I have to do realignment better I leave it alone ,I am sure I could not realign it properly ,any advice fellows ,thanks so much for your?
?time all the very best Rick

Hello Rick
I will defer to the experts, but if a radio is working fine then leave it alone.? Unfortunately it's a lesson I have learned the hard way.
Cheers, Phil

I agree with Phil. Transistor based radios operating on low DC voltage rarely have capacitor problems. The higher the voltage the more likely you are to have capacitor problems. It doesn't hurt to visually inspect the electrolytic capacitors and replace any that show leakage or bulging. The main problem with replacing all of the electrolytic capacitors is the cheap circuit board material used in almost all Japanese radios. The boards work OK for new assembly but not so much for repairs. The glue holding down the traces may let go if overheated. An ESR meter would be a good first non-destructive capacitor tester. There are also in circuit capacitor testers for further non-destructive testing.

73
Roger VE7LB

Hello Rick,

I have 2 FRG-7 from around the same year and until they are showing signs of problems I won't change the caps.

Also I don't believe that you have to do a re-alignment because most of the caps are used for DC buffering / filtering.

But of course I could be wrong on the last part.??

Hello Fellows ,first of all thanks so much for the input ,might be best not to mess with the set ?,I see that there is not a lot of room on the board ,things are very close
?and I don,t want to do any damage , good advice if it ain't broke don,t fix it .I think I will ask Santa for a ESR capacitor checker so I can check condensers in?
circuit ,I pulled out the chassis and it looks very clean and no bulging caps, is it normal when you try to tune or find shortwave stations there is a noise between
?stations ,I call it a snow noise like the way TV's way back when made when there was no channel on at the time , just asking never had a shortwave radio like
?this before , only had old console floor models that had many bands on them ,loved those sets used to stay up late at night to see what I could tune in from
?far away, again thanks so much ,take care and stay safe all the very best Rick?