Hello to the list. Feel like I should offer my $0.02 worth here. Many old receivers such as my SX-17F and the SX-28 were designed for 110 volts AC. Lots of us have 120 up to 125 volts in the houses built in last 30-40 years which means more volts. More volts everywhere. Add to this that it is real easy to solder a couple of solid state diode accross the 5Z3 socket and all of a sudden you have 470 volts of B plus. A 6L6 is speced at maximum 360 volts!. Especially if you decide to use 40, to 100 mfd capacitors in place of the old wimpy 8 mFds used in the old stuff. One solution is the Variac or 500 to 800 ohms resistance in series with the filter choke. All that said, 6F6, 6V6, 6L6, metal tubes all, can get pretty warm running at rated input which means that the vent holes provided on cabinets of these old beasts must not be blocked by being pushed next to and under several hundred pounds of other boat anchors. Happy New Year to all, and 73. Mike K4XM
> > From: "w5sum" <[EMAIL PROTECTED]> > > To: [email protected] > > Date: Mon, 29 Dec 2003 11:34:18 -0500 > > Subject: [AMRadio] SX-28 help > > Reply-To: [email protected] > > > > > > 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 > > > _______________________________________________ > AMRadio mailing list > [email protected] > http://mailman.qth.net/mailman/listinfo/amradio > --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.554 / Virus Database: 346 - Release Date: 12/20/2003
