NOS metal 6L6s run too hot. Fender had tremolo or vibrato on some amps. Princeton 6G2 First tube is preamp, is specified. There are exceptions to this rule like the the Bronco. Fourth tube is the driver and vibrato modulator. Any 5U4 type is acceptable. This tube need not be low-noise or nonmicrophonic. Second tube is vibrato channel preamp, is specified. A low-noise, low-microphony 12AX7 or is recommended.
Fender Blackface amps & early Silverface amps used cloth covered wire All Fender amplifiers, manufactured after include a date code on the amplifier. How the "Hand Stamped" Date Code Works.
The Code on the tube chart of your Fender Amp is made up of two letters. The First letter equates to the Year and. Date Code: Most Fender Wide Panel Tweed, Narrow Panel Tweed, Brown, Blonde, and Blackface amps will have a date code hand-stamped on the tube chart.
Power tubes--a pair of 6L6GCs s originally specified.
Common Fender Source Codes. Super 6G4A First tube is first channel preamp, is specified. The AB version uses a 5U4 type. Fourth tube is a 12AX7. Second tube is preamp, is specified.
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|A low-noise, low-microphony 12AX7 or is recommended.
Vibrolux and Vibrolux Reverb. Sixth tube is a 12AT7. This tube does not need to be low in noise, however it should have good quality cathodes in order to handle the load.
Bandmaster 6G7, Concert 6G12 V specified.
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Solid-state rectifiers do not wear out as tubes do, nor can they be replaced by the user. Third tube is a 12AX7.
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Third tube is the bass channel driver. Any 5U4 type is acceptable. Any 12AX7 or is usable here- -it need not be low-noise or low-hum, nor does it need to be tested for microphony. In either case, the code works the same. Power tubes are a pair of 6L6GC s originally suggested.
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Third tube is the driver and reverb recovery amplifier.
Avoid using NOS metal 5Y3s, only glass.
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If you have a later silver-face or blackface Deluxe amp, the plate voltage will be very high--plugging low-cost Russian or Chinese 6V6s into such an amp is risky. Fender installed casters on some larger amps and cabs beginning in DO NOT use other types. Any 12AX7 or is usable here--it need not be low-noise or low-hum, nor does it need to be tested for microphony.
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|The solid- state diodes used in older Fender amps are rather primitive compared to modern devices--if you wish slightly better performance, suggest speaking to a service technician about replacing the diodes with modern fast-recovery epitaxial FRED diodes.
Remember, many components could have been changed over the years, speakers blow, caps dry out, transformers melt down, and pots wear out. A low noise, low microphony tube is recommended here. Bassman 6G6A, 6G6B These models are identical to the Bassman 6G6, except they models use solid-state rectifiers rather than tube rectifiers.
Power tube is 6V6.