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Classic gear from yesteryear; vintage audio standing the test of time.

Brook Model 3, then 4, then 7 preamps...

All of the Brook stuff is very fine. Their first preamp was mounted side-saddle on their super rare first version 30W PP2A3 amp. Then, the four knobbed type 3 preamp arrived, which umbilically powered up from the 10C (30W) or 12A (10W) PP2A3 amps. The model 4 preamp came, soon after, with 5 knobs and very versatile, switchable/variable phono EQ. It also stole voltages from either amp, or, a very, very rare external power supply. All of these preamps, so far, used triode connected 6J7 and 6SJ7 tubes.
The model 7 preamp is a very desireable, self-powered preamp, with the same versatile EQ switching and very useable tone controls. Utilizing some miniature triode tubes, it's topography is similar to the preamp section found on their final amp offering, the model 22 integrated amp. Into the mid-'50s, designer/engineer Lincoln Walsh was the last, stubborn hold-out for all triode circuitry, while everyone else was racing to the higher power pentodes. He knew the triodes had the "natural sound."


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