New preamplifier write-up: Sofrito

So*fri*to

noun

an aromatic base used to add subtle flavor to cuisine (esp. Puerto Rican cooking)

Click here for the write up for a 6V6 preamplifier with extra big bottles. Although biased for linearity, this preamp is designed to impart a little triode flavor to your system. Fundamentally, it’s a classic resistor-loaded grounded cathode amplifier stage, with some extra power supply and VU meter shenanigans.

Voltages here are high due to the power transformer used, but it could be adapted easily for lower voltage secondaries. Just shoot for about 350V before the feed-forward hum-bucker tube in the power supply.

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