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Vacuum tubes are shockingly durable. They get hastily pulled off stage, loaded into tour buses, trailers, back seats, and then rattled about for thousands of miles on end without fail. […]
Noval/9-pin tubes such as your typical 12AX7 or EL84 have pins that are mounted directly through the glass envelope. Since there’s no base assembly these tubes are indexed by aligning […]
Many tube types have a large number of common and not so common names that denote the same tube type/specs or similar specs with subtle changes or optimizations. The classic […]
Vacuum tubes found in common guitar amplifiers and most audio equipment can range from cool to the touch to several hundred degrees Fahrenheit. A typical 12AX7/ECC83 in a normal (low […]
In regard to basic tube amplifiers we can define “Biasing” as setting the idle plate current flowing through the tube. Less current means lower dissipation in the plate (less heat […]
Generally speaking when we talk about biasing an amp we’re specifically referring to the output/power tubes. However there are some applications where specific pre amp stages may have adjustment or […]
Very few guitar amplifiers are strict Class A. If you have a guitar amp with one power tube, which is known as single-ended, it’s Class A by default. This would […]
Lost Vacuum: As the name implies vacuum tubes are built in such a way that the inside of the bottle (generally glass but in some vintage tubes can be metal), […]
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