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12AU7

I had a similar success with my VTA version of the Dynaco ST-70 amp. I installed the VTA board in one of my ST-70s a number of years ago, but never liked the results. I tried a few different brands of coupling caps, and several different 12AU7s, or 12BH7s. I populated the board using a variety of well regarded resistors, including Dale RN and Riken, but no matter what I tried, was never happy with it.

After reading for who knows how many times what a bad tube the 12AU7 is (as Palustris indicates) the "what the heck, I'll try it" light bulb finally went on for me. I bought an adapter for the voltage tube socket of the VTA, plugged in a 6SN7, and finally have an amp I can enjoy listening to music through.



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  • 12AU7 - 1973shovel 10:45:52 07/07/22 (2)

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