Experience the full potential of your audio system with this Dynaco ST-70 Amplifier upgrade PC-3 circuit card.  If your ST-70 still has the original PC-3 circuit card that also uses the hard-to-find and expensive when you do find one, the 7199 tube.  This upgraded PCB gets rid of the hard-to-find 7199 tube and uses much cheaper and more plentiful 6GH8 tube; and the old, worn-out and out-of-spec original PC-3 driver card is replaced with a new modern FR-4 fiberglass/epoxy circuit card.  This new circuit card has all new parts with tighter tolerances and better performance than the old PC-3 card that Dynaco built and used.  Includes New-Old-Stock (NOS) Sylvania 6GH8A tubes.

This upgrade features film caps from WIMA, and higher tolerance resistors of either 1% or 5% tolerance; and is a far better circuit board with better parts than anything Dynaco used in the original ST-70- plus it's not 50+ years old either!

With a driver circuit board upgrade, an ST-70 will deliver clean and crisp audio for all your favorite tunes. Made in Europe, this upgrade is a must-have for any audiophile with a stock ST-70. Dynaco is synonymous with high-quality audio equipment, and this driver card upgrade lives up to that reputation. Don't miss out on the opportunity to elevate your listening experience with this ST-70 amplifier upgrade driver circuit card.

We upgrade Dynaco ST-70 amplifiers and regularly take trade-in ST-70's that have other upgrades- after a check-out if the component passes our inspection, we'll put it here on eBay and let others enjoy the upgrade at a reduced price, since it is of course used.  This upgraded circuit card was removed from a working ST-70 and will work in your ST-70- it is a drop in replacement.