New! Lot 5 Electronic Tube GE 12AX7 ECC83 Amplifier Guitar Valve Audio NOS, US $230 – Picture 0

New! Lot 5 Electronic Tube GE 12AX7 ECC83 Amplifier Guitar Valve Audio NOS, US $230 – Picture 1

New! Lot 5 Electronic Tube GE 12AX7 ECC83 Amplifier Guitar Valve Audio NOS, US $230 – Picture 2

New! Lot 5 Electronic Tube GE 12AX7 ECC83 Amplifier Guitar Valve Audio NOS, US $230 – Picture 3

New! Lot 5 Electronic Tube GE 12AX7 ECC83 Amplifier Guitar Valve Audio NOS, US $230 – Picture 4

New! Lot 5 Electronic Tube GE 12AX7 ECC83 Amplifier Guitar Valve Audio NOS, US $230 – Picture 5

New! Lot 5 Electronic Tube GE 12AX7 ECC83 Amplifier Guitar Valve Audio NOS, US $230 – Picture 6

New! Lot 5 Electronic Tube Ge 12ax7 Ecc83 Amplifier Guitar Valve Audio Nos

US $230

san cristobal, default, Venezuela
Jun 9th

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For Sale Lot 5 tube electronic GE New!!! Made in Yugoslavia New Condition A1 belong to a lot of old parts that are stored .. 12AX7 (also known as ECC83) is a miniature dual triode vacuum tube with high voltage gain. It was developed around 1946 by RCA engineers[1] in Camden, New Jersey, under developmental number A-4522. It was released for public sale under the 12AX7 identifier on September 15, 1947. The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for audio applications. It is popular with tube amplifier enthusiasts, and its ongoing use in such equipment makes it one of the few small-signal vacuum tubes in continuous production since it was introduced. Contents [hide] 1 History 2 Application 3 Similar twin-triode designs 4 Gallery 5 See also 6 References 7 External links History[edit] The 12AX7 is basically two 6AV6 triodes in one package. The 6AV6 was a miniature repackaging (with just a single cathode) of the triode and twin diodes from the octal 6SQ7 (a double-diode triode used in AM radios), which itself was very similar to the older type 75 triode-diode dating from 1930. As of 2012 the 12AX7 was made in various versions by two factories in Russia (Winged C, formerly Svetlana, and New Sensor, which produces tubes under the Sovtek, Electro-Harmonix, Svetlana,Tung-Sol, and other brands for which the firm has acquired trademark rights), one in China(Shuguang), and one in Slovakia (JJ), for a total annual production estimated at two million units. The vast majority are used in new-production guitar amplifiers or for replacements in guitar and audio equipment. Application[edit] The 12AX7 is a high-gain (typical amplification factor 100), low plate current triode best suited for low-level audio voltage amplification. In this role it is widely used for the preamplifier (input and mid-level) stages of audio amplifiers. It has relatively high Miller capacitance, making it unsuitable for radio-frequency use. Typically a 12AX7 triode is configured with a high-value plate resistor, 100k ohms in most guitar amps and 220k ohms or more in high-fidelity equipment. Grid bias is most often provided by a cathode resistor. If the cathode resistor is unbypassed, negative feedback is introduced and each half of a 12AX7 provides a typical voltage gain of about 30; the amplification factor is basically twice the maximum stage gain, as the plate impedance must be matched. Thus half the voltage is across the tube at rest, half across the load resistor. The cathode resistor can be bypassed to reduce or eliminate AC negative feedback and thereby increase gain; maximum gain is about 60 times. The initial "12" in the designator implies a 12-volt heater requirement; however, the tube has a center-tapped heater so it can be used in either 6.3V or 12.6V heater circuits.

“Never Used, Tested”

Brand	GE
Country/Region of Manufacture	Unknown
MPN	Does Not Apply