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Friday, September 29, 2023

The Compactron Phono Preamplifier - part 1


Work is in progress for a Compactron Phono Preamplifier.

This time in Orange!

This is a stand alone phono stage based on the phono section of the Compactron Preamplifier. It is for MM cartridges and has variable EQ adjustments to adapt for the recording curves of different vintage records. Bass turn over and treble roll off are independently adjustable. Load impedance and capacitance can be selected as well. In addition there is a phase switch which allows to change the polarity of the output signal.

The outputs are transformer coupled and offer both RCA and XLR connections. The gain is selectable via a switch on the back in 4 steps.

The top plate is kept in aluminum color and it is glass pearl blasted for a matte surface.

Some of the initial assembly steps.

The internal modules:

The module with the main signal section.

Power supply section:

Another plate holds the gain selector switch.

Signal sub module mounted to the main plate and partially wired.

Front plate:

A choice of different knobs is available.

Stay tuned for an update when this phono stage is finished. Contact me if you want your own Compactron preamplifier. Of course it can also be built for MC cartridges or switchable between MM and MC.

Best regards


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