The Philips, Holland made, ECC83 / 12AX7 is one of the greats in the NOS world. Many audiophiles and musicians prefer these to NOS Mullard 12AX7. Having lush tone and liquid highs, this tube is very desirable for Hi-Fi and Musical Instrument amplification. These tubes have the halo getter and bear the delta date code showing they were made in the 1960's in Heerlen, Netherlands. Other have the code I63 B3K2. There are 7 matched pairs so hurry before their gone. Matched pairs on the Amplitrex AT1000. Prices shown are for a matched pair of 2 tubes. These are very rare tubes testing very good a rare chance to get and choose your matched pairs! The tubes with the code I63 B3K2 are made in Blackburn on the Mullard factory! Also available 2 matched pairs Philips Miniwatt ECC83 with RED TIPS selected for the Philips 'Nat Lab' ultra rare.
Matched RARE Western Electric CK-5755 tubes in pairs. One of the best replacement tubes for a 12AX7, ECC83, 5751. Longlife 10.000 hours. Tested en matched on Amplitrex AT1000. Matching ADAPTERS from 12AX7 ECC83 to 5755 available! Price = for a pair of 2 tubes! This CK-5755 is a double-triode made by Western Electric (USA) for Raytheon. It has same specs as 12AX7A / ECC83 / 7025 but with different pinout for Pin 2+3 and 6-8 (see data sheet). For use as 12AX7 an adaptor or an adjusted socket wiring for pin 2+3 and 6-8 is required. Western Electric marked this tube WE 420A for their own brand. The CK-5755 "features special cathode springs which reduce microphonic response. This characteristic is controlled by a "microphonic stability" test for balance in which the tube is tapped at shock levels of 400 - 600G."
One of my customers bought this tube with an adapter for his 12AX7 based amplifier. He reported back to me: 'best I ever had' even NOS stuff like Mullard is nowhere near the performance of this tube.....
This is the famous 5/80 USA NOS 5755 made by Raytheon. As part of the medium MU ECC83 12AX7 it has a different pinout but can be used in this type of circuits. During the years this tube proved to be of excellent sonics. Can be matched in 1% matched gain and balanced triodes. Also still reasonably priced. Price = for 1 tube.
These are NOS new JAN 5670W from GE. Made in USA 3/87. Excellent sturdy longlife tube replaces 6N3, 6N3P, 6N3P-E and 6N3P-DR. Part of the medium MU ECC83 family. Many 1% matched gain and balanced pairs available. Comes with original boxes. Price = for 1 tube.
Matched 1% Amplitrex AT1000 pair of 2 tubes RFT 12AX7 aka ECC83. Made in East Germany 1970's for NATO armed forces. Matched at 1,5/1,5 mA vs 1,5/1,5 mA. Matched and balanced triodes. Excellent for headphone amplifiers or phonostages. Price is for one tube.
This is one of the best testing tubes I know. Voshkod Rocket 09/91. The test scores on the Amplitrex are on par with the USA NOS top GE 5* series. All more then 100% on gain and GM. Longlife 5000 hours. Excellent for matching on gain and balanced triodes. Can sometimes replace ECC83/12AX7. Not the same pinout however. These a highly underrated tubes, give an excellent warm tube sound. Sounds warmer and less 'hot' compared to classic ECC83 12AX7 tubes. Price = for 1 tube.
These are the Russian equivalent of tubes like 5670, Chinese 6N3, 6N26P, 2C51 or ECC42. Excellent longlife 5000 hours tubes with lovely glow. Measures well on the Amplitrex which says much about their quality. Good matching too. Recommended as recplacement tube for all headphone amplifiers, tube preamplifiers, phono amplifiers etc.. Prodution date 92/02. Reflector factory. Price = for 1 tube.
Reflector 6N3P-E replaces the 5670, 2C51, ECC42 and 6N26P. Good quality Russian tube made 12/80 and 05/85. Nice clean molybdeen pins. Very good sounding tube with 3 mica's! Very stable, excellent microphonics. With boxes but these are badly damaged! Price = for 1 tube.
Longlife 10.000 hours best Russian tube 6N3P-DR sister of 6N3, 6N3P-E, 6N3P-EV, 5670, 2C51, ECC42 and 6N26P. Impressive tube. Excellent sonics, allow for 100 hours break in time. Matched on the Amplitrex AT1000. Scarse and in demand. Excellent upgrade on standard stock tubes. Prices shown are for matched pairs.