UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Heatercathodeshort · 2nd Jun 2021, 3:51 pm

I think the alignment twiddling problem was probably caused by a poor AGC system resulting in signal overload on quite moderate settings but guys working on these should have been well aware of it. I.F. twiddling was far too common back in the 60's. I don't think it employs a V/U valve as a common sound on vision amplifier.

My example is fine with a 18DB attenuator in the aerial input that other receivers do not require. These is a preset 'set AGC' slider inside but it's not 'nice'. John.

2nd Jun 2021, 3:51 pm	#53
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Murphy V659/759 restoration I think the alignment twiddling problem was probably caused by a poor AGC system resulting in signal overload on quite moderate settings but guys working on these should have been well aware of it. I.F. twiddling was far too common back in the 60's. I don't think it employs a V/U valve as a common sound on vision amplifier. My example is fine with a 18DB attenuator in the aerial input that other receivers do not require. These is a preset 'set AGC' slider inside but it's not 'nice'. John.