This phono preamp is based on the circuit for an ultra low noise RIAA phono preamplifier in Texas Instruments Application Report AN-222 “Super Matched Bipolar Transistor Pair”. The matched transistor pair replace the input transistors of an opamp. The circuit was designed for the LM394 transistor pair, which was discontinued. My board uses the (pricey) Analog Devices MAT12 replacement. The IC is an LM318, as noted on the application report.
The raw power supply is 6L6’s version of the Pass Pearl2 supply, and a Jung/Diddden Super Regulator coverts it to +-15V for the phono board.
This is a very smooth, quiet preamp.
Dimensions: 4.25H x 10L x 8.25D (inches). That is a laser cut LP of the Seattle skyline on the front.
Documentation and extra pcbs (raw ps and phono) included.
$100, OBO, shipping to CUS only
11/19/2020 ***SOLD***
The raw power supply is 6L6’s version of the Pass Pearl2 supply, and a Jung/Diddden Super Regulator coverts it to +-15V for the phono board.
This is a very smooth, quiet preamp.
Dimensions: 4.25H x 10L x 8.25D (inches). That is a laser cut LP of the Seattle skyline on the front.
Documentation and extra pcbs (raw ps and phono) included.
$100, OBO, shipping to CUS only
11/19/2020 ***SOLD***
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