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EL84, 6BQ5, CV2975, 6P15, N709, OUTPUT PENTODE, B9A

The EL84 output pentode was introduced by Mullard in 1954. To demonstrate its use and quality the Mullard applications lab produced an amplifier design - the now classic 5-10 high quality audio amplifier.  When used as a pair in an ultra-linear push-pull configuration with 43% distributed loading the output could reach 10W with 0.9% total harmonic distortion.

With ultra-linear operation the screen grids were connected to taps in the in the output transformer primary winding. The valve operating conditions so produced were intermediate between a triode and a pentode. The operation of the distributed loading was to introduce negative feedback directly within the output stage.  The EL84 found use in many classic valve guitar amplifiers, classic and current valve hifi amplifiers.



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EL84, MULLARD, NEW SHIELD, MATCHED PAIR, SIMILAR FACTORY CODE kM1 B1L1, kM1 B1L2, BLACKBURN NOVEMBER 1971 MANUFACTURE
EL84, ZAERIX, 1970s PRODUCTION,

EL84, ZAERIX, 1970s PRODUCTION,
EL84, NEC, 1970s PRODUCTION,

EL84, NEC, 1970s PRODUCTION,
EL84, SOVTEK, MATCHED QUAD,

EL84, SOVTEK, MATCHED QUAD,
EL84, PINNACLE, TESTED

EL84, PINNACLE, TESTED
EL84, MULLARD, YELLLOW PRINT, kM1 B5G2, BLACKBURN JULY 1965 PRODUCTION

EL84, MULLARD, YELLLOW PRINT, kM1 B5G2, BLACKBURN JULY 1965 PRODUCTION
EL84, MULLARD, NEW SHIELD, KM1, B1D1 BLACKBURN APRIL 1971 PRODUCTION

EL84, MULLARD, NEW SHIELD, KM1, B1D1 BLACKBURN APRIL 1971 PRODUCTION
EL84, MULLARD, OLD SHIELD, rX1 BA5, BLACKBURN JANUARY 1955 PRODUCTION

EL84, MULLARD, OLD SHIELD, rX1 BA5, BLACKBURN JANUARY 1955 PRODUCTION
EL84, MULLARD, OLD SHIELD, KM1 B9K1, BLACKBURN DECEMBER 1969 PRODUCTION

EL84, MULLARD, OLD SHIELD, KM1 B9K1, BLACKBURN DECEMBER 1969 PRODUCTION
EL84, NEC, MATCHED QUAD, 4X, SAME PRODUCTION LINE, 1970s PRODUCTION,

EL84, NEC, MATCHED QUAD, 4X, SAME PRODUCTION LINE, 1970s PRODUCTION,
EL84, MULLARD, NEW SHIELD, KM1 B4L2, BLACKBURN NOVEMBER 1974 PRODUCTION

EL84, MULLARD, NEW SHIELD, KM1 B4L2, BLACKBURN NOVEMBER 1974 PRODUCTION
EL84, TUBE AMP DOCTOR, TAD, MATCHED QUAD, SAME FACTORY CODE,

EL84, TUBE AMP DOCTOR, TAD, MATCHED QUAD, SAME FACTORY CODE,
EL84, WILLOW BOXED, RFT PRODUCED , 1974 PRODUCTION

EL84, WILLOW BOXED, RFT PRODUCED , 1974 PRODUCTION
EL84, SIEMENS, kM04 code, NOVEMBER 1960 PRODUCTION

EL84, SIEMENS, kM04 code, NOVEMBER 1960 PRODUCTION
EL84, MULLARD, NEW SHIELD, KM1 B5G1, BLACKBURN JULY 1975 PRODUCTION

EL84, MULLARD, NEW SHIELD, KM1 B5G1, BLACKBURN JULY 1975 PRODUCTION