howdy Brett well I took out the 6L6's and put in 6V6's this morning. They run pretty hot but not glowing red or anything. I brought my 8 pin octal tube extender socket with me to work this morning so I can check all the voltages. I have a pretty nice s hop at work so that is where I'm working on the 28 since my boss is off until next monday LOL
73's Ronnie On Tue, 30 Dec 2003 09:13:45 -0500, Brett Gazdzinski wrote > 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 > _______________________________________________ > AMRadio mailing list > [email protected] > http://mailman.qth.net/mailman/listinfo/amradio The "AM" voice of Shreveport, Louisiana USA formerly WN5AIA and WB5AIA I got my Extra Class the old fashioned way... I earned it!
