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Masco MA-25

The original Masco MA-25 was manufactured in 1947. The Masco that I own is a second generation MA-25P. The suffix is N indicating that it is a later model, probably mid 1950s. Masco stands for MArk Simpson COmpany. The company was in Long Island City, New York. The company later became Fanon/Masco.

The amplifier I have originally had a phonograph mounted atop but it was long gone when I got the amp. The output was rated at 25 watts. The output stage was cathode biased. The phase splitter was the anode follower type.

Here is the original schematic as best as I remember it.

Masco Model MA-25PN schematic.  Click here for larger schematic.

Click on the image for a larger diagram suitable for printing.

The following is a photo of the identification plate on the back of my amplifier.

I.D. plate on Masco.  Click here.

Masco Amplifier.  Click here. Masco Chassis.  Click here.

The two photos above are pictures of my Masco MA-25PN.
The picture below is of the older Masco MA-25.

Early Masco MA-25

Wade's Audio and Tube