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Old 15th Jan 2020, 11:12 am   #14
Peter.N.
Dekatron
 
Join Date: Jul 2008
Location: Charmouth, Dorset, UK.
Posts: 3,601
Default Re: Bush TV12/TV22 differences

The TRF models had to be stable all the coils were tuned to the transmitter frequency, plus or minus a little to give the necessary vision bandwidth. The TV12A was made for Alexandra palace, the only transmitter operating then. 45Mhz vision and 41.5 Mhz sound only they were Mc/s in those days.

Most of the TV's I worked on in the early days were TRF's.

Peter
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