6J5 NOS Single RCA GE HJ-1005 Amp Tube 6J5GT Triode

Description

This listing is for a single NOS 6J5 tube of either GE or RCA brand, tested new.
The electrical characteristics of the 6J5 are identical to the ubiquitous 6SN7. It only contains a single triode instead of two as in the 6SN7. The 6SN7 is very popular among amplifier builders and also found it's way into many commercial designs. There are good reasons for it's popularity. It is very linear and has a decently low plate resistance making it suitable as driver in power amps. Pretty much everybody who builds amplifiers at some point used or considered the 6SN7. Hence it got quite costly. Therefor it is surprising that the electrically identical 6J5 seems not to be very popular and is still available at low prices.
The 6J5 uses an octal base. The pinout is pictured on the left. It has an amplification factor of 20 which classifies it as medium mu triode. The plate resistance is about 7kOhm which makes this tube usable with transformer coupling. Of course it is equally well usable LC or RC coupled or as a cathode follower. It is very often used in the famous and once popular SRPP and mu-follower circuits.
A fine tube, which deserves more use! It can be used in a stand alone phono preamplifier
. It will replace the 6N7 in that circuit for getting a lower output impedance to make that phono section usable stand alone.
There is another good use for the 6J5. In power amps which use both halves of the 6N7 paralleled, a 6J5 can be used without modifications
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