Tubes Asylum

Would that be easier than just replacing the driver board with the VTA Octal one?

73.143.183.29

JoshT

A

In Reply to: RE: A 6CG7 could be used... posted by 1973shovel on April 03, 2023 at 09:09:23

I don't know enough to answer the question myself, but I'm curious how easy it would be to have the board replaced at some point. I don't feel the need at this point because this approach is working so well.

___
"If you are the owner of a new stereophonic system, this record will play with even more brilliant true-to-life fidelity. In short, you can purchase this record with no fear of its becoming obsolete in the future."

Edits: 04/03/23

Follow Ups:

It would certainly be "easier" from a physical labor standpoint - 1973shovel 09:53:40 04/03/23 (2)
Using three 6CG7s would only involve cutting a few traces on the circuit board, and soldering in six jumper wires. Installing the octal board involves removing and reinstalling more wires, as well as the hardware of the board itself. Not that that's a lot of work, but technically it is more work. But buying a new octal board would allow you to sell the used 12AU7 version, along with the adapter, so there's that.

But the real question, one that Airtime and I have speculated on, is how much sonic improvement (if any) would be gained by changing the phase inverters (the two outer tubes) to 6SN7s or 6CG7s.

He even posted the question to the Asylum, and possibly elsewhere, but I don't know if he was fully inspired by any of the answers he got. If I needed a new board, I wouldn't hesitate to buy the octal version. But since the VTA ST-70 isn't my main amp, I'm going to stick with the 12Au7s in the phase inverter positions, at least for now.
- Thanks - JoshT 13:43:13 04/03/23 (1)
  I don't know whether this will become my main amp, or at least my most used one. I bought it when a friend flagged it for me because I've wanted to own an EL34 amp for years and the price seemed so attractive at $1195 plus $35 shipping. And now another $74 for the single 6NS7 plus shipping.
  
  My main amp was a CJ Premier 11A, but it might not go back into this system for awhile, at least not without an A-B session. I do love that amp, but the ST-70 is singing with my easy to drive Devore Super Nines. I'm sure it's not as great a match with many other speakers.
  
  Thanks again for all your great advice.
  ___
  "If you are the owner of a new stereophonic system, this record will play with even more brilliant true-to-life fidelity. In short, you can purchase this record with no fear of its becoming obsolete in the future."
  - I'm glad it's working out for you (nt) - 1973shovel 07:09:09 04/04/23 (0)

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