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vinrads · 2nd Mar 2018, 5:31 pm

I decided to have another go at this one. It is an early superhet "Raie Studio nine valve" using fixed iron core I.F transformers.
There appears to something missing at the front end.

There is only one coil unit, a Bowyer Lowe Oscillator Coupler model 3, 250/550 the I.F frequency is around 140 kc/s.

The strange thing is it works in a fashion by feeding a strong sig to the control grid of the first valve, and is tuned by the frame tuning capacitor, the osc tuning capacitor does nothing.

It may have modified in the past, I don't know !
Any help would be appreciated. Mick.

2nd Mar 2018, 5:31 pm	#1
vinrads Dekatron Join Date: Feb 2009 Location: Chesterfield, Derbyshire, UK. Posts: 3,761	Supersonic Heterodyne radio 1920's. I decided to have another go at this one. It is an early superhet "Raie Studio nine valve" using fixed iron core I.F transformers. There appears to something missing at the front end. There is only one coil unit, a Bowyer Lowe Oscillator Coupler model 3, 250/550 the I.F frequency is around 140 kc/s. The strange thing is it works in a fashion by feeding a strong sig to the control grid of the first valve, and is tuned by the frame tuning capacitor, the osc tuning capacitor does nothing. It may have modified in the past, I don't know ! Any help would be appreciated. Mick. Attached Thumbnails Last edited by vinrads; 2nd Mar 2018 at 5:36 pm.