[Milsurplus] RCAF AT-12

[Hubert Miller]

I was thinking IF I keep the AT-12 I would do the same modulation scheme, cathode modulation using either 6Y6 or transistor. I also was thinking sub 2 1625 or 807,
whichever socket fits, so I could operate it with more modest heater and plate voltages, more easily gotten. 
-H 

>I saw the error but didn't have time to respond. I built a power supply using connectors ordered from Bendix and used the TA-12G for ten years before selling.Used cathode keying  and as I recall a 10H choke in the keying lead to cut down the clicks and removed the vacuum antenna relay. It worked well on 80/40M and had the sound of a crystal controlled rig. 

Had the modulator but never used it and used a 6Y6 in clamp tube modulation ( cathode)  imnstead as it was cheap and simple but not as efficient. The various combinations of antenna circuits, by switching capacitor combinations was very clever and a match to everything but a wet noodle was achievable. 

The TA-12G had 4 channels with separate vfos and was always tempted to try the LF channel  which tuned to 500Khz although penalties were severe for misuse in those days. The plate modulator offered high level modulation and any TA-12's I heard in this mode sounded very good. They appeared to have a spurious emission around 6Mhz when used on 75M so a separate antenna tunes was very wise. 

I have seen the transmitter that Hu's photo depicted but can't recall where. 
Fun memories. 
Ralph
VE3BBM