6N3P / 2C51 / 5670 Tubes >  Upgrades for Tube Amps - BOI AudioWorks from BOI AudioWorks
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2C51 / 5670 / 6n3p

2C51 and 5670 Tubes

2C51 / 5670 tube is US made medium gain dual triode tube. We call it the little tube that could - it can do radio frequency amplifier, oscilator and even mixer duty, as well as high fidelity audio small signal amplification. There are still NOS US made 2C51 / 5670 around. They are all rugged and precisely made. Of these 5670W GE JAN is the best value.

Russian 6N3P

In the cold war era, US 5670 tube design was copied and mass produced by the Soviets. This tube is referred to as 6N3P. These tubes were numbered using Cyrillic alphabets which has caused some confusion since it looks more like 6H3R to us westerners. Whichever way you spell it, the tube is 6N3P. And it is plug-in compatible with their American counterparts, 2C51 and 5670.

6N3P was made by several factories in Russia. We have seen them from Reflektor JSC in Saratov Russia, Voskhod JSC in Kaluga, Russia, and rare and unknown Oktjbr' factory in Vinnitsa, Ukraine, All of these factories produced 6N3P with high degree of reliability and longevity but each has characters of their own. If you are into tube rolling, it would be a lot of fun to sample 6N3P form all the factories.

High Reliability Versions / 6N3P-E, 6N3P-EB and 6N3P-DR

Russian made 6N3P is a great rugged tube. Russians took ruggedness to extreme and further screened 6N3P tubes into varyingl grades for high reliability and military use. These tubes are designated with E, EB and DR in the increasing order of longevity and reliability.

Chinese 6N3P

6N3P was produced in China in mass quantity as well. Since it is an excellent audio tube at low cost, there have been numerous amp designs that use this tube. If you are looking to upgrade the 6N3P in your amp, Russian 6N3P are great choices, as well as US NOS 2C51/5670.


Various

5670/2C51 NOS

Various 5670 in stock. TRIODE, DUAL

In stock
5670/2C51 NOS Buy Now $7.00

Russian

6N3P-DR NOS

TRIODE, DUAL
6N3P-DR is the 6N3P screened for highest reliability requirement for Russian Military use. See 6N3P-E below fore more information.

In stock
6N3P-DR NOS Buy Now $11.00

Russian

6N3P-DR NOS Matched Pair

Price is for a matched pair of 6N3P-DR.

In stock
6N3P-DR NOS Matched Pair Buy Now $26.00

Russian

6N3P-E NOS

TRIODE, DUAL
6N3P is also known as 6N3-pi or 6H3pi. Electrically equivalent to western 5670 tube.
6N3P-E we carry is 1980's production by Reflektor factory in Saratov, Russia. E version is extra high reliability type with >5000hr lifetime guarantee. These will make a very good upgrade from stock Chinese 6N3P in Shanling CD players

In stock
6N3P-E NOS Buy Now $8.00

Russian

6N3P-E NOS Matched Pair

Price is for a matched pair(2 tubes) of 6N3P-E

In stock
6N3P-E NOS Matched Pair Buy Now $20.00

Russian

6N3P-EB NOS

TRIODE, DUAL
6N3P-EB is the 6N3P screened for high reliability and long life. See 6N3P-E below fore more information. Current stock of 6N3P-EB was manufactured at Vinnica factory in Ukraine, featuring double mica.

In stock
6N3P-EB NOS Buy Now $8.50

Russian

6N3P-EB NOS Matched Pair

Price is for a matched pair(2 tubes) of 6N3P-EB

In stock
6N3P-EB NOS Matched Pair Buy Now $21.00

Western Electric

WE396A NOS

TRIODE, DUAL
May come in white box.

In stock
WE396A NOS Buy Now $62.00

Western Electric

WE396A USED

TRIODE, DUAL
Used, comes in white box.

In stock
WE396A USED Buy Now $40.00
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