Radio Road Which tuner to get and getting the most from it. Thank God, for the radio!

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RE: Ceramic IF Filters and Tube Type Tuners

Posted by strijw426 (A) on May 12, 2011 at 19:31:50

In Reply to: RE: Ceramic IF Filters and Tube Type Tuners posted by Steve O on May 12, 2011 at 18:43:23:

I also have an FM-3 which I put together about 1964 or so. It still works but does not have the sensitivity or selectivity I need now to pick up WRR FM at 65 miles or so from the location of the transmitter tower. We have a local station adjacent in frequency the captures the receiver and wipes out WRR most of the time.

I might consider modifying the FM-3,but it also needs a better front end. That said, I always marveled at how well temperature compensated the front end was on the FM-3. It never had AFC and did not need it. I could turn off the tuner late at night and turn it on again the next morning and it was right on frequency. The engineers at Dynaco really did their homework on this design.

I always operated the FM-3 with a Rotron cooling fan behind it as I thought it got quite hot to the touch with no fan cooling. I did the same with a Dynakit Stereo-70 I owned at the time.

Yes I think that careful attention should be paid to matching impedances whenever possible. That way spurious responses and detuning of circuits is kept to a minimum. Distortion should be lower also.

It is getting late and time for this little guy to head for bed!

Joe

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