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The valves with the PRE -AMPLIFICATION function in Audio have mainly the function of electrically boosting the signal coming from a source (microphone or analogue or digital). Generally they can be used in two stages: entrance and pilot. They can also act as a phase inverter or other. The pre-amplification stage is generally high-gain, suitable for the first amplification of a signal of the order of tens of microvolts.
5751 SIEMENS ECC83 12AX7 6057 E83CC B759 PAIR SPECIAL VALVES DOUBLE TRIODE AUDIO...
WONDERFUL PAIR of 5751 SIEMENS double AUDIO triode for HI-FI and HI-END sets, microphones, musical instruments, TOP TUBE Special Quality "A class" , TRIPLE mica. HIGH performance!
VT-99 VT99 TUNG-SOL 6F8G CV1918 (6SN7 sub) VALVE PAIR DOUBLE TRIODE "FLAT plates" NOS/NIB
RARE PAIR of Double Triode valves VT-99 TUNG-SOL version with "flat ribbed plate". HIGH quality standard, US Army Signal Corps supply manufacturing, EXCELLENT!