Bought this restored amp from Chris Kellar (cjpinka) in Nov 2011. Chris has a good reputaion on the gon and his work is even sought out by some. Bought this to verify that all tube setup is for me (it is), but now I am moving up to more power. The amp is in about the same shape it was when I bought it from Chris. I've bumped it down to an 8 though since I've been using it for a few months. I'm asking the same price I paid but with a bonus: had Chris upgrade the power transformer with a much better, larger, heavy duty, new one from Triode electronics. This one is quiet and allows u to run this thing day and night if you want to. Here is the link to it:
35 watts/2 channel. Modern 5 way 8 ohm binding posts on back. Here is the description in the original add by Chris:
Here is super nice example of a Dyna ST-70 power amp. The ST-70 is one of the most popular amps of all time, with over 300,000 of them made. This one has been totally restored to better than new spec: chassis and tranny bells stripped, sanded and painted; new power supply filter can; new bias supply; the old phenolic driver board with its contaminated traces replaced with a new FR-4 board outfitted with top grade caps and precision resistors; selenium rectifier replaced with a diode; new cooler running ceramic tube sockets; new RCA's and speaker barrier strips; heavy duty power cord. Tubes are an excellent quad of E.I. Fat Bottle EL-34's, vintage Black Plate 7199's and a new 5ar4 rectifier. This has the original cloth lead Dyna tranny's of course, which are among the best ever made.
The amp runs dead quiet and sounds absolutely superb. Wonderful soundstage and imaging. Cosmetically, it looks great. Wife approval should be no problem. One of the last few of these I will be restoring, as health problems are forcing me to give up this hobby, for a while at least.