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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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In Reply to: External Deemphasis Adjustment posted by David Lawrence on October 31, 2023 at 14:59:06:
Neither the MR-71 or the FM-3 have external de-emphasis switchability (as you already know), and the correction can not be accomplished via interconnect. The change to the circuit must be done internally, and with the FM-3 at least, a series of capacitors and resistors must be changed, as shown on the circuit boards above, indicated by the red arrows.
The circuit schematic to change the FM-3 from 75 uS to 50 uS may be available somewhere, but you'd have to know your way around a soldering iron, even if you do find it. I can't speak for the MR-71, which may involve changing a single resistor, but I have my doubts about that.I think the easiest route would be to do as Itman suggested and find yourself an FM tuner with an external switch, such as his Pioneer F-90 has.
The good news may be that FM tuners are now often available at nearly-give away prices. Visit the Tuner Information Center (link below) and they may have tuners with externally switched de-emphasis listed, to make your search easier.
Edits: 11/01/23 11/01/23
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Follow Ups
- No - 1973shovel 07:15:08 11/01/23 (3)
- RE: vintage tuners - ltman 15:52:47 11/01/23 (2)
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