Quote:
Originally Posted by Aerodyne
Interesting thread, David. A useful resource for others who may find an RF1-U has come into their possession.
Tony
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Thanks Tony.
Another popular signal generator for hobbyists is the Tech TE20D which pop up on e-bay from time to time, which also used two valves, but has a silicon rectifier.
Not quite as easy to work on as the RF1U as they have a rather compact PCB and it can be a challenge to relate the circuit to the actual layout. It's been covered in several threads on the forum. I think the dial on the TE20D has the edge on the RF1U dial. At £15.00 plus 7/6d post back in June 1970, it was a good deal cheaper than the ready made Heathkit RF1U (£20.8s.0d) was in 1966, but even so, it was by no means cheap. Respectively, at today's prices the TE20D equates to £225, (plus £5.00 post), in contrast to a ready made RF1U at £363 equivalent in 1966.
The TE20D features in the Henry's Radio advert on page 96 of June 1970 PW, alongside that other favourite - the Tech TE15 GDO (£11.10s 0d) at this link:
http://www.americanradiohistory.com/...PW-1970-06.pdf
Back then, I had to make do with a simple home-built F.G. Rayer P.E. design - even then I saved for weeks just to buy the Osmor coils!
For today's home-brewers on the forum, let's not overlook this one!:
https://www.vintage-radio.com/projec...generator.html