Hi OM... When I did my last SX-28 I found a heating prblem in the audio also... not outside of the norn really. be sure to check the bias on those audio tubes... and the impedance of that replacement audio tranny...
My last one had a replaced power tranny and all the voltages were off... Re-cap the machine... bypasses etc... and check all those screen resistors... awww heck... check all the components... it is rather old enit??? :-) these are fun radios and well worth the time... 73 vince ka1iic On Monday 29 December 2003 04:34 pm, w5sum wrote: > Morning All > > well I have dived headlong into my SX-28 restoration. The first order of > business was to try to get the wiring correct in the audio output stage. It > had a replacement audio output transformer, and the wiring to the headphone > jack was all wrong... end result was that there was NO audio available at > the speaker jacks on back and bad audio with headphones. > > I had a parts unit here so I took the audio transformer out of it,and put > it in the one I'm restoring. I wired the headphone jack up correctly, and > the speaker jacks on back. I now have decent audio from the speaker > terminals with the factory speaker, and so so audio using a 8ohm headset at > the headphone jack. > > HOWEVER, the 6L6's ( someone subbed out the 6V6's ) run scalding hot.. I > mean.. so hot you can smell them. I have changed EVERY component in the > audio section around the output tubes, and the 6SC7. > > Anyone have any solutions to why these tubes are getting so hot? > > thanks in advance > > > r > > The "AM" voice of Shreveport, Louisiana USA > formerly WN5AIA and WB5AIA > I got my Extra Class the old fashioned way... I earned it! > _______________________________________________ > AMRadio mailing list > [email protected] > http://mailman.qth.net/mailman/listinfo/amradio
