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Old 15th Jan 2020, 8:27 pm   #17
flyingtech55
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Join Date: Nov 2005
Location: Ayrshire, UK.
Posts: 1,096
Default Re: Bush TV12/TV22 differences

Quote:
Originally Posted by Peter.N. View Post
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

I guess the IFs were stagger tuned to provide the necessary bandwidth, especially for the sync. signal. How many transmitters were there in the early days? Presumably Alexandra Palace (Ally Pally)? Also, if you owned a set in the London area and then moved North, the television would be rendered useless?
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