Output is supposed to be 90mHz but it just produces some strange white noise on composite and mpx output I tried a couple of crystals but nothing changed.Ġ01.JPG Ġ02.JPG Ġ03.JPG Ġ04.JPG Ġ05.JPG Ġ06. The meter circuit has a battery holder for a AA cell, which seems a bit odd. It uses tubes and transistors (apparently germanium) the tubes are 0A2, 6CW4, 6K11, two 6189 (12AU7), 12AX7 and two 6CX8. The latter needs doubling in frequency to 38 KHz in order to restore the suppressed carrier and demodulate the L-R signal. I haven't figured out what frequency the crystal should be. The incoming composite signal is filtered into its three components: the mono audio, the suppressed-carrier difference signal, and the 19 KHz pilot tone. When I got it the tube shields and a crystal were missing but the rest seemed complete a resistor was loose and a RF transformer had been disconnected (but it seems to measure OK). The construction is good but definitely home-made. The original germanium transistors still not only test well but are performing consistently on both channels and sound very rich. The MPX circuit and tuner also received special attention. It was also designed for integration into a Fisher console stereo unit, although very few were likely built. Fully Restored Sherwood S8000 IV 36WPC Stereo FM/MPX Receiver - Famously Good Sherwood Performance A. This decoder was also available with an optional cabinet. The MPX-10 was an add-on decoder designed for use in conjunction with an FM tuner which had a multiplex jack. Turned out really well or exceeded my expectations )All discrete stages. The MPX-10 was designed for use with the Crosby system. I got this on eBay and it was listed as a Navy Multiplex generator there is nothing Navy about it. DIY FM all transistor stereo radioA radio that I built recently to challenge myself.
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