UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - 'Beau Decca 131 projection receiver 1950'

Heatercathodeshort · 13th Oct 2015, 8:39 am

Exactly the same tuner in mine David, probably with coils for channels 2 and 10, a Cyldon 10L.
It was simplicity in itself to convert to ITA with these tuners. Simply remove the RF amplifier and frequency changer EF42 valves and replace them with the two adaptor plugs picking up HT and heaters from the RF plug and feeding the tuner IF in with the other.

In fringe areas the IF plug could be removed and the output fed directly into the grid of the frequency changer converting it to an extra IF stage. It was necessary of course to stop the local oscillator by shorting the coil. J.

13th Oct 2015, 8:39 am	#17
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: 'Beau Decca 131 projection receiver 1950' Exactly the same tuner in mine David, probably with coils for channels 2 and 10, a Cyldon 10L. It was simplicity in itself to convert to ITA with these tuners. Simply remove the RF amplifier and frequency changer EF42 valves and replace them with the two adaptor plugs picking up HT and heaters from the RF plug and feeding the tuner IF in with the other. In fringe areas the IF plug could be removed and the output fed directly into the grid of the frequency changer converting it to an extra IF stage. It was necessary of course to stop the local oscillator by shorting the coil. J.