Got C5 replaced, and then checked the AC-4 bias voltage. It ranges high now, from -50 to -90 volts. I tried the PS supply with the bias pot turned all the way down. Noted some improvement as the meter no longer pegs, but stops at 250 mA--still way too high. Within a few seconds of power-up, the transmitter keys in TUNE mode. Have the vox control on the side of the chassis turned all the way CCW. I guess the thing to do would be to subsitute a good 6EV7 as previously suggested (will have to order a new one), and maybe replace all the diodes in the AC-4.
Al, I did look over your webpage prior to my electrolytic cap rebuild and it is very helpful. Everything works pretty much as you outlined. I ended up with my 47 mfd caps at C5 extending out over the sides of the base, so I can't reuse the original paper cover. Next time I try it, I can probably set one cap in slightly higher than the other, so the outside diameter is not so large. What I have now does not look very good, but it does work. I got interested in radio as a SWL in the early 60s, but did not get my ticket until 1977. Except for building a VTVM and code practice oscillator, I missed the Heathkits because of a long period of inactivity. Now back and am enjoying building Elecraft gear. The 4B line is a lot of fun to operate, and hopefully I can learn a little something about the inner workings of it as well. 73 to all, Don ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
