Tubes4HiFi OCTAL driver for Dynaco ST70 (assembled/tested)

Description

Tubes4HiFi OCTAL driver board for Dynaco ST70, assembled/tested.   THOUSANDS of satisfied customers.   Take your amps from 1960s performance to 2020 performance,
it will sound 10x better and run cooler.  This replaces the PCB using the old 7199 tube, with three 6SN7 tubes (not included).
IDENTICAL to our "classic" driver board except uses 6SN7 tubes instead of 12AU7 tubes.
Also replaces ALL of the old bias circuit, and you can now set EACH output tube bias for optimum performance.
Increases power to 40wpc and reduces distortion.
Also available as a KIT or as a bare PCB (see our other auctions).
google tubes4hifi and find all of our great products, modifications, and accessories.
This modification and uses a CCS (constant-current-source)
in the "long-tailed" phase inverter for perfect AC phase balance, and is THE premium ST70 modification available on the market for over 30 years.
FREE shipping in USA.
Here are just a FEW of the HUNDREDS of comments we've gotten from customers . . .
Awesome amp. I am really happy with the results. This is my final product for my system. We are using the amp now and we are extremely happy with it. Thank you for your awesome design and I will recommend your kits for anyone else that wants this quality product.
This amp simply kicks ass sonically and i look forward to recommending your products. thanks for the good after sale bedside manner for dopes like me. Mike All-in-all, I am pleased with how your circuits perform and would not hesitate to purchase other kits from you. Your technical support when I had a problem has also been excellent. I do not know how much positive feedback you receive, but I thought I would let you know we are happy with your circuits. My wife said this is the best sounding system we have had so far. Best regards, Ralph
"I finished your mod and this is honest to god the first time I ever enjoyed listening to an MK3..
The MK3 has always sounded kind of sloppy, but this mod tightened it up and the overall tonal balance is much much much better. The biggest thing I noticed was the linearity of the sound
and the focus of the instruments possess an exponential difference now as opposed to the stock MK3. The amp is tighter and much faster."
Now for the sound. Let's just say I used the board on a few Dynaco's and I was happy with the results as compared
to other mod boards and stock boards I tried. But when I put the boards in it took on a new life form.
Dynamics in spades. Musical? None better! This is the best mod to a Dynaco amp I ever heard. The music is about as real as it gets with lifelike images that make you feel the musicians and singers are in the room
for a personal performance just for the listener. The bass is extremely accurate and tight. I felt it was a bit bloated on the original Dynaco.
Try this board! You will be glad you did and it is easy to install.