The preamp circuit is pretty simple, being a two-stage single-ended design using both halves of the tube. Between the two is a three-band tone control circuit as used in classic guitar amplifiers ...

It’s not the whole truth though, as [Albert van Dalen] demonstrates with his tube preamplifier running ... takes the lower voltage. The circuit appears at first sight to be a conventional ...

Likely you know that the vacuum tube amplifier stage has fairly high input impedance; but because the transmitter input standard is 50 ohms, an impedance matching network is necessitated in the design ...

Figure 3 Output spectrum of the optocoupler circuit in Figure 2 with an input signal of 200 mV RMS. As one can see, the second harmonic of a 5 to 15 W tube amplifier dominates the spectrum, and EL34 ...

The MGP-1A is completely different: It's not digital. The MGP-1A gives you 18 all-tube, all-analog preamplifier circuits in one easy to use 3U rack mount unit. Factor in tone shaping features like a ...

The goal was to keep the circuit simple and the number of amplification stages to a minimum while having enough gain to be driven by most preamplifiers, solid-state or vacuum tube. This suggested ...

but when I heard the new ModWright PH 9.0 tube phono preamp I knew it deserved a more extended listen at home. And now that it's here, I'm so glad I made the request. LPs sound more "analog ...

Tone King has unveiled the Imperial Preamp, a “high-voltage tri-tube” preamp pedal that takes the tones of the Baltimore, Maryland high-end guitar amp brand’s Imperial MKII combo and ...