Recommended tubes for LTA Preamp

My favorite are NOS Telefunken ECC801S diamond bottom made in Germany. I also like NOS Siemens ECC801S.  The Telefunken are pretty pricey. 

I like the Brimar Yellow T 6060 12AT7. They have them in stock at The Tube Store. The Brimar are warmer and slightly less detailed than the Telefunken and Siemens.

If you are looking for a brighter more detailed sound, I'd get one of the first two. If your system is already bright, I'd try the Brimar. 

That's been my experience, anyway. 

Siemens 12AU7 NOS are a nice improvement in clarity over the stock tubes.  Lowers the gain a bit as well, which is helpful unless you are running LTA amps.

When I had an LTA integrated with a preamp section, I contacted Brent Jessee at tubes.com for his recommendation.  I told him sort of what sound I was looking for and he gave me great advice. 

I replaced the 12AT7s with Telefunken ECC801s. I replaced the 12SN7s with CBS/Hytron VT-231 per a recommendation from Brent Jessee. I definitely recommend reaching out to Brent. He is incredibly knowledgeable and extremely helpful.

In my system, the tube changes were a dramatic improvement in sound. There was better top and bottom extension. The sound got even more dynamic. It wasn’t cheap, but the rolling to me was well worth it.

The VT231 is the military version of a 6SN7GT. 

The LTA can use either (6SN7/12SN7) with the flip of a switch.

DeKay

Interesting. 

A-A:

Link to a much less expensive unit with easy/vast/extensive tube/cap rolling capability.

https://www.musicalparadise.ca/store/index.php?route=product/product&product_id=103

DeKay