6V6 / 7408 / 6V6GT Beam Pwr Tetrode
The 6V6 is an 8-pin "octal" beam power tetrode tube found in the power amp section of many guitar amps. It is popular in many single-ended power amps, but can also be found in sets of two or four matched valves. It has a 6.3v heater filament, and can dissipate 14W. Being one of the oldest still active electronic devices, there are many substutute tube numbers available. These can mostly be substituted with appropriate bias adjustment. The original 6V6 tube featured a metal envelope. Due to superior performance, the more modern 6V6GT, which also features a glass envelope, remains the only type still manufactured. The 6V6 is widely used in older Fender amps.
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