VTA mod board

Category: Amplifiers

Hi,

I know all of you out there who are do it yourselfers(DIYer's) have done a mod or two on the most recongnized modded amps around, the Dynaco ST-70 and the Dynaco Mark III's. Well, I have bought just about every mod board available and have even done a few on others not sold mainstream from time to time. My favorite, until now, was the Kevin Kennedy(KTA HiFi) board until I tried on a whim, a VTA board from Tubes4HiFi. Immediately, with no warm up, this board was showing much promise and once it warmed up it was all there, period. After looking at the schematic and seeing what was done I was saying to myself and a very close friend who is an accomplished tech, was saying the same thing. "This board shouldn't be doing to the amp what it is doing." It took a marginal amp and made it great. I then had the urge to try this schematic on a pair of Heathkit W7's. If the Dynaco ST-70 is great, then the Heathkits are world class. These amps smoked the Dynaco from the beginning of the bandwith to the last and final note. There is a difference between the two amps besides the transformers. The Hathkits have solid state rectification where the Dynaco is tube rectified. I, at some point, just to be fair to Dynaco and its followers, am going to change the rectifier to solid state, just to compare apples to apples. I doubt it will make that much difference but one never knows. I am not a solid state lover in the recitifier but you just can't tell the Heathkits are solid state rectified with this board. This is a great mod board. Just try it!