It’s a simple preamp circuit that has graced the small-signal ... No special “warm valve sound”, but it did give me the momentary cachet of a pair of glass tubes on top of the stack.

The cathode current is only 0.15 mA, but the preamplifier delivers a 3.5x gain. There is more detail on his website. It would be interesting to subject this circuit to a full audio analysis and ...

This circuit layout produced low distortion ... It had the sound of a valve amplifier with a cool-running transistor design. The 33 and 303 amps were so good, they are still sought out by made ...

The C55 Preamplifier is described ... Its four vacuum tubes (or valves) deliver a warm listening experience. Electronic bass and treble circuits allow for volume level adjustments of low and ...