6sn7 to 6922 adapter: good idea or bad idea?

Maybe they don't know...

Maybe they don't know...

@atmasphere  ,  I don't think that speaks well for them either.

I've used 6SN7s with the 6922 adapters (from Tube Depot) on 3 different pieces of Decware equipment with terrific results. I'm a big fan of the 6SN7 and have an extensive stash, so it was definitely a win for me. If you search the Decware site there were many similar success stories.

Of course, checking with the manufacturer is always advised. I checked with Steve before I tried it and he thought the difference in the heater specs would be handled fine by his power supplies and he was correct. Other amps may not fare as well.

I thought the sonics were as good and often better than the 6922s I tried, plus I had lots of 6SN7s to roll. If you were starting from scratch and having to purchase either 6SN7s or 6922s, then the economic advantage pretty much goes away.

I used Garage 1217 6922 and 6sn7 adapters with great results in a couple MHDT dac’s. 
 

The 6sn7 and 6922 tube replaced the 5670 tube and sounded very nice in comparison. I had a large stash of very nice 6922 and 6sn7’s and was told by manufacture it was okay to run them so why not, but they were only tube buffers. 
 

Not sure I would feel comfortable in a preamp  unless amp manufacture could guarantee with no issue, even then would be a little skeptical. 
 

I found the Garage 1217 adapters to be very high quality ceramic sockets and gold plated pins.

I thought the sonics were as good and often better than the 6922s

@armstrod I've often felt that the 6922 is not a good tube for audio and also think the 6SN7 to be better. But the 6SN7 has different operating characteristics so its highly unlikely that the 6SN7 in your situation is actually strutting its stuff. A change in the cathode resistor value is likely to unlock that.