06-04-2006, 04:37 PM
I'm just beginning the restoration on this radio and in doing the initial visual inspection I found 2 cloth covered wires that need to be replaced due to fraying, there was a mouse nest in this one. There are only a few cloth covered wires in the whole set and I'm wondering if there is some special reason that this type of wire is used. The 2 wires that need replacing are in section 4 of the schematic, represented by the two squiggly lines, test point C, to a ground lug on the tuning condenser, and to the FM aerial coil L402. Can I use a plastic covered wire in its place?
! But not much else. FM band gets one station all the way across the dial, only a couple of stations on BC and SW bands, this is with the internal cabinet antenna hooked up. I ran it for about 5 minutes and noticed the 6V6 tubes were VERY hot, even the bases, so I shut it off. I have the service manual from Chuck, thanks, and am going to pull the chassis out and start the troublshooting routine and checking test point voltages. I suspect the voltages are too high. Couple of questions before I start: Do I pull the tubes out for the testing of the chassis? Can resistors be tested while in the circuit or do I need to remove one end? Will it harm anything if I power on the chassis without the speaker attached? It looked like part of the circuitry runs through a choke or transformer which is part of the speaker. When resistors age or go bad does the resistance go higher or lower, or do they just open? Hope I haven't gone in over my head on this one, only my second recap job. My first one was a Telefunken table top console, Opus 7084W, and everything went guite well on that. I just bought an extra 47-1230 chassis on ebay so I'll have something to compare to and get the few parts off that I need.
