What amps use 12AX7 tubes?
The most common preamp tube for tube guitar amplifiers is the 12AX7. They have been in use since 1947 – so the Fender Tweed’s, Vox’s, Supro’s, and many other amps up through the modern Marshall DSL100 amps use 12AX7 preamp tubes.
Can a 12AX7 be used as a power tube?
But yes, most of the driving a 12ax7 as a power valve stuff has been about them in general, not on a valvetronix specifically. On a valvetronic with the master at 10 it still gives a fair amount of power stage compression. Actually power tube distortion isn’t just for “uber metal”.
How many watts is a 12AX7?
| 12AX7 | |
|---|---|
| Heater voltage | 12.6 V (series) 6.3 V (parallel) |
| Heater current | 150 mA (series) 300 mA (parallel) |
| Anode | |
| Max dissipation Watts | 1 per section |
What does an audio output transformer do?
Audio transformers can: 1) Step up (increase) or step down (decrease) a signal voltage; 2) Increase or decrease the impedance of a circuit; 3) Convert a circuit from unbalanced to balanced and vice versa; 4) Block DC current in a circuit while allowing AC current to flow; 5) Electrically isolate one audio device from …
What is the amplification factor of a 12AX7 tube?
All 12AX7 tubes have an amplification factor (μ) of 100 (“high-mu”). Ideally, every 12AX7 should yield the same gain when placed in the same circuit.
What is a 12AX7 switching box used for?
A custom 12AX7 switching box was constructed to allow for a quick switch comparison of six tubes at a time while plugged into the V1 socket of a Marshall JCM800 2203 guitar amplifier.
Do all 12ax7s have the same gain?
Ideally, every 12AX7 should yield the same gain when placed in the same circuit. However, in reality there are comparative gain differences among 12AX7s. The purpose of this comparison is simply to provide guitar players with a frame of reference to help in finding the best current production 12AX7 for their needs.
What is the preamp circuit used for 12AX7 comparison tests?
Schematic of the preamp circuit used for 12AX7 comparison tests. A custom 12AX7 switching box was constructed to allow for a quick switch comparison of six tubes at a time while plugged into the V1 socket of a Marshall JCM800 2203 guitar amplifier.