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Tung Sol 5751 dual triode preamp tube. Made in Russia. NOS specs call the 5751 a “special 12AX7” having a high-mu amplification factor of 70.
Jesus is Lord
Reviewed in the United States on June 15, 2024
I compared the Tung-Sol 5751 to a N.O.S. Raytheon 5751 black-plate in the V1 position in a Fender Concert 2, and the differences between the two were relatively small. The Raytheon tube was a bit sweeter-sounding and spongier-feeling to the fingers, but the Tung-Sol was a bit fuller sounding. Overall, the Tung-Sol is a good sounding and well-made tube in Russia from the current production, and a good alternative to expensive N.O.S. stock.
Mrs. Guadalupe’s Class
Reviewed in the United States on April 20, 2023
Works as expected. Great sound.
Mike Jordan
Reviewed in the United States on February 12, 2017
I use these for the preamp in my Doge integrated amplifier and in V1 of my tube guitar amps when I'm looking to reduce the gain from a 12Ax7. The Tung Sols have the closest tone I could find to NOS RCA 12AX7's. I'll sometimes spring for the RCA12AY7's but they are getting quite expensive, and the Tung Sol is an excellent and affordable alternative.
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