06-18-2007, 04:55 PM
now that the restoration is complete with all caps replaced and deteriorated wiring redone, followed by a complete alignment, it receives stations on bcst and sw just fine. all tubes test good.
now the problem is the hum that was there before the restoration is even worse. on strong stations it doesnt just hum but it gurgles. the stronger the stations the worse it is.
would it help if I paralleled the filter caps with a higher value? also, would it help if I tied the negative side of the filter caps to the chassis instead of the end of the filament string? oh, I also found out you cannot tie the chassis to ac ground. it quickly blew the fuse I put in the ac line.
guess I need a refresher course in ac/dc radio theory and a good book on troubleshooting and modifications would sure help, along with a copy of the technical bulletins.
regards, Dick
now the problem is the hum that was there before the restoration is even worse. on strong stations it doesnt just hum but it gurgles. the stronger the stations the worse it is.
would it help if I paralleled the filter caps with a higher value? also, would it help if I tied the negative side of the filter caps to the chassis instead of the end of the filament string? oh, I also found out you cannot tie the chassis to ac ground. it quickly blew the fuse I put in the ac line.
guess I need a refresher course in ac/dc radio theory and a good book on troubleshooting and modifications would sure help, along with a copy of the technical bulletins.
regards, Dick
