Thordarson used some type of push pins, they came with the iron. I had a BIG mod transformer, the T-11m78 that had screw terminals, I used it in the 30K-1, and it went with it when I sold it. I have the same transformer with the push pins, its much smaller, has rounded sides, push pins on the side. Must have been a change, the older ones having the terminals?
The T-11M78 worked very well in the 30K-1, at 2500 volts. Sounded quite good to me. I have not looked at it, but its likely possible to change out the push pins, by replacing the entire insulators, or adding a screw through each push pin with nuts, lock washers, etc. I have some of the push pins, but you need quite a few in some configurations, my pair of 4D32 transmitter will be low impedance, and need to parallel up both the primary and secondary, lots of push pins! The new project (4D32 rig) has changed from a transceiver to the worlds largest and most complex 200 watt AM transmitter, with separate decks for rf, rf control, modulator, power supplies (one for modulator, one for RF, with variac), and eventually, a home brew VFO/exciter. The thordarson mod transformer will go into it. I will need to experiment with it, the 4D32 tubes can run with higher voltages, 1000 volts I have been told. At 600/700 volts, the power output should be 200 watts, who knows with 1000 volts on the plates. Ray tells me the article on the second home brew receiver will start in the January issue of Electric Radio. Brett N2DTS > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Todd Bigelow - PS > Sent: Tuesday, December 30, 2003 6:32 PM > To: AMRadio@mailman.qth.net > Subject: [AMRadio] Thordarson transformer question > > > Thanks to the link that Pete posted earlier, I found the > information on > a mod transformer found at a hamfest a few years back. It's a > Thordarson > Multi-Match model T-11M78, 300-500 watt model. Something puzzles me, > though - in the listing information it says "Features Thordarson > Switchboard Plug-in Terminal Board for quick and accurate matching of > tube loads". Now, I noticed that the terminals didn't have a typical > threaded screw hole or post like most others, but I have no idea what > kind of 'plug-in' plugs it uses. Is there anyone out there who could > shed some light on this matter for me? > > Many thanks - > > Todd, KA1KAQ > > _______________________________________________ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
