Old graymark radio
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The circuit is nearly identical to the Knight Broadcaster shown below. The original circuit was transformerless with series-wired heaters and half-wave rectified AC to produce B+. Even at 100mW, it might have a shot at making a contact, particularly if I can set up a sched so someone would be listening (carefully) for it. Well, this is a bit surreal, but I was discussing my high school station's transmitter (a Graymark 505) and the topic "drifted" to putting it on 40M. This is the 50l6 tx and it regen mate along with the one tube modulator For me here the beverage in studio B or the Loop & regen in Studio A give a big advantage.
Of course half the battle to working low power is to hear well. I read all the cake pan and PW stuff with get interest. Even if like the BK deal just a couple of weekends a year. It would be exciting to get something going. But the right conditions should produce success. I also have a two band 6l6 Am only rig but so far it hasn't produced. I built a one tube (01A)cathode modulator for the other Cw rigs and tried it a week ago on the 50L6 rig s it is also cathode keyed. I still have my 50L6 rig and use it on Cw with it matching regen a bit. And if you built it a few days before from your junk box that is a bonus. Something fascinating about a glowing tube or two, a crackling set of earphones and a successful QSO. I worked the BK with my CW rigs the second weekend and had decent results. He repeated back to me some of what I said but said he had a high noise situation but we should try again when conditions were better as he was just getting snitches. He said try again and he would see if he could get me in the clear. The band was pretty noisy But I switched on the 45 tube rig tuned up and gave it shot. I heard a New Jersey station calling today obviously low power and stated he was running about 33 watts. The BK deal last week proved that for sure on Cw, now it is AM time. I sure hope someone will see this and connect the dots. (50c5 to 50l6 perhaps)Funny thing was I was at the time beginning construction of a 117p7 tubed Am rig. I would like to hear the on air test and would be up for a QSO with one of my PW rigs if possible. They were discussing 940 rigs just prior to this. All I remember is one earlier on had call letters ending in BBC and there was a reference to that made. I would love to hear that 50C5 rig on air but I didn't write any calls down.
#OLD GRAYMARK RADIO PLUS#
However I have a 50L6 transmitter that I cathode modulate on 80M plus another 50L6 screen mod)unit that does both bands. I immediately put the heaters on on my 45 transmitter but before I could join the conversation company arrived for a visit and I was done. He described it as a 50c5 final modulated by another 50c5 and if I heard correctly a 6aq5 speech amp. There was a discussion going on about the new rigs and out of the blue the subject turned to one of the fellows playing with his old high school broadcast transmitter and perhaps putting it on the air on 40 sometime. 119 E George St.This afternoon I was working on my shack and reading the mail on 40M on or about 7920.
#OLD GRAYMARK RADIO HOW TO#
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#OLD GRAYMARK RADIO MANUALS#
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