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    Dynaco's least known piece of tube gear > the FMA-2 insert amplifier

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    Bob Latino
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    Dynaco's least known piece of tube gear > the FMA-2 insert amplifier

    Post by Bob Latino on Sun Apr 30, 2017 10:38 am



    In 1961 Dynaco came out with its first FM tuner the FM-1. Although this tuner was not very sensitive, if fed a strong signal, it WAS a nice sounding tuner. During the early 1960's STEREO FM was just starting and Dynaco created an FMX-3 multiplex insert to upgrade the FM-1 to receive stereo broadcasts. What many Dynaco tube fans do not know is that Dynaco also came out in 1963 with an "insert amplifier kit" that could be inserted into the space for the FMX-3 multiplex unit called the FMA-2. The FMA-2 essentially turned the FM-1 into an FM radio but without a speaker. The FMA-2 was a single channel amplifier similar to one channel of an ST-35 amp. This little amp module used two EL84 output tubes but used a 12AX7 driver tube while the ST-35 used a 12DW7 driver tube. The real interesting thing was that you could use the FM-1/FMA-2 just as a mono tuner without a speaker if you wanted and no harm would come to the amp section. This is probably Dynaco's rarest piece of tube gear. In 1964 Dynaco came out with their FM-3 stereo tuner. This left the FM-1, FMX-3 and the FMA-2 as largely forgotten pieces of Dynaco history. Only once in the past 15 years or so have I ever seen an FMA-2 insert amp for sale on Ebay. If you are interested in checking out more info on the FMA-2, a link to the manual is below ..

    FMA-2 insert amplifier manual

    Bob


    Last edited by Bob Latino on Wed May 03, 2017 10:00 am; edited 1 time in total

    GP49

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    Re: Dynaco's least known piece of tube gear > the FMA-2 insert amplifier

    Post by GP49 on Mon May 01, 2017 3:23 am

    I knew someone who had one: my father's best friend. They were both dentists and became fast friends while in dental school. This friend set up practice in Modesto, CA and installed an FM-1 with FMA-2 amplifier for the music in his office. It never gave one whit of trouble over the decades, and was still going strong when his car was broadsided by a driver who ran a stop sign. He was seriously injured and unable to resume practicing dentistry; he sold the practice and the building he had built to house it...including the Dynaco FM-1/FMA-2.
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    pichacker

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    Re: Dynaco's least known piece of tube gear > the FMA-2 insert amplifier

    Post by pichacker on Tue May 02, 2017 7:22 am

    Interesting how the output stage is fed off a large -ve supply and the anodes of the output valves sit near to 0V potential. Bit of a difficult one to get your head around.

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    Re: Dynaco's least known piece of tube gear > the FMA-2 insert amplifier

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