• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

YAQIN VK-2100 tubes replacement

Go to ebay and look for a 12ax7 to 6n2p adapter. 12ax7 on the top side and 6n2p on the bottom side. This adapter will also parallel the 12au7 and 12at7 filament to use with the 6.3V 6NP1.

It however won't change gm nor bias spec. But for some tube rolling fun, properly may be good enough.
12AU7 versus 12AT7:

Same filament voltage and current
All 9 pin connection are the same

Different u (mu), max gain
Different plate resistance
Different transconductance
Different plate dissipation
Different capacitance
. . . other than those 5 factors, they are completely interchangeable.

How can 2 completely different tubes both be interchangeable with a 6N1?

What is the adapter that mates a Ford motor to a Chevy transmission, anyway?
Last edited:
Joined 2004
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Why do you want to change the 6N1 tubes? Don’t you like the sound, or something else? As pointed out, it is not a good idea to “roll tubes” of different types if you are not knowledgeable about what you are doing. Also, if you have a schematic please post it - you are likely to get more sensible feedback then.

The best replacement for a 6N1 is a tested (and matched) Russian 6N1P-EV. No other tube type is a good substitute in a circuit that is optimized for 6N1. If the manufacturer stated that 12AU7 and 12AT7 could be substituted the circuit is not optimized for 6N1 alone, but if so specified it should accommodate the 12AU7/12AT7 substitutes. Why do you doubt the manufacturer’s specification?

Please print out the datasheets for 12AU7, 12AT7, 6N1, 6922, ECC85 and 6BQ7 and compare the important parameters. Be careful not to exceed the max plate voltage on a substitute, especially 6922, if you should try it.

Also see: Substitute for 6N1? 6922 mebbe? | Audiokarma Home Audio Stereo Discussion Forums

Good luck.
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Thanks for the informative response.
I actually ordered the Russian 6N1P-EV but the seller wrongly sent me different tubes. I do have 12au7 ad 12at7 tubes that I would to roll.
I just want to ensure that these tubes could safely substitute for the 6n1.
I will research on the suitability of these tubes.