Well, I would compare the two tube types, look at the typical operating voltages of both tube types, voltages on the plates and screens, bias voltage, resting current.
Measure what you have in your receiver and compare. In some applications, they run the tubes at high resting current for low distortion, but my SX17 has had the same audio output tubes in it for years and years, and I don't think they get very hot. I forget what they are, 6V6 or 6L6 tubes, but they don't run very hot. You can lower the screen voltage, or raise the bias, the RCA tube manual should have the proper operating values for push pull service, AB1 I think they run. My SX17 (sold now) sure sounds nice into a big 3 way speaker. Its supposed to be 12 watts or more I think, and has no problem driving the big speaker with very nice fidelity, just as good or better than the Marantz amp. All the SX17 needs to be a real nice AM station receiver is one of those digital frequency displays that pick up the LO signal and display the exact frequency you are tuned to. Fidelity is great, bandwidth choices are good for AM, wide is quite wide, narrow is narrow enough under most crowded conditions. Sure looks like a real receiver, like the SX28, beautiful backlit S meter with the Hallicrafters logo in it, big chrome frequency dial, loads of knobs, etc. I have had the SX17 for over 5 years without a single problem with it. Very nice gear. Brett N2DTS > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of w5sum > Sent: Monday, December 29, 2003 11:34 AM > To: [email protected] > Subject: [AMRadio] SX-28 help > > > 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
