6L6 needs about 20-25V bias in that circuit. You can increase the cathode bias resistor's value in order to get it.
Also, the 6L6 needs more bias voltage than the 6V6 for the same idling current if I am not mistaken. It is possible that you may be drawing over 90mA instead of the 70mA or so of the 6V6's. I'd put 6V6's back in, and not risk overheating the power transformer in that radio. > 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] > > 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 >
