There are quite a few variants of the basic design in existence. The display receiver has been used by the N.Z. Civil Aviation Branch. It obviously has done quite a bit of work on the amateur bands later in its life and has been modified to some extent.
Nine valves were used which were: 2 RF stages 6K7, Mixer 6L7, Local Oscillator 6C5, 2 IF stages 6K7, Detector/Audio Amp 6R7, BFO 6C5 and Audio Output 6C5.
The receivers required a separate power supply of 6.3V (heaters) and 180Vdc for H.T.
The tuning mechanism used components imported from National, U.S.A., the manufacturers of the HRO.
© Ian O'Toole, 2009. Page created: 28/04/03 Last updated: 27/10/2012