> Classifieds > > Dynaco St 70 tube amp available to trade for Sonographe SA 250 amplifier

OFF - FOR TRADE: Dynaco St 70 tube amp available to trade for Sonographe SA 250 amplifier

Item #649373869
Info: Dynaco St 70 tube amp available to trade for Sonographe SA 250 amplifier

Payment method: Paypal
Ships to: United States
Condition: 7 - Good (?)
Date Posted: Aug 19, 17 11:36am (PST)
Edited: Oct 25, 17 6:06am
About Seller: OH, United States
Product Brand: Dynaco ST-70 Sonographe SA 250
Product Model: ST 70. SA 250
Days in System:180

The feedback period is over for this ad, so feedback is no longer allowed. For details please read this FAQ entry.
Share |


Sponsored post - log in to remove this ad.
** This Ad is Marked as OFF by seller and cannot be responded to. **

Vintage Dyna ST 70 in good working condition is available for trade for a working Sonigraphe SA 250 amplifier.

This ST 70 functions without issue. It was reconditioned by a world class custom tube amplifier maker years ago and then boxed and stored until about two years ago. The unit has the desirable transformers with cloth leads. All circuitry was inspected to make certain it followed the original schematic and then tested for any needed upgrades for aging parts. The only parts replaced were four coupling capacitors on the input board which were sourced to sound as close to the original caps as possible. The only other difference between this amp and completely stock is that the stereo/mono switch has been removed and the high end amplifier designer Who builds $10k mono amps and who did the tech work said that the ST 70 sounds better in stero anyways. It would be easy to install the mono/stereo switch with a few minute wiring. There are also two notches- one on each side of the bottom plate. The bottom is still functional but it does have two 1 1/2" cut outs.

The cosmetics are average to above average for the units age. The cage is in nice shape with no rust and the chrome though not new in appearance is still not rusted through or significantly pitted. All tubes function but you might want to experiment with new EL 34's or the tube of you choice. The amp has a wonderfully musical sound that is open and focused and involving. This is a back up amp and I would like to have a more powerful unit to experiment with.

Your Sonographe 250 does not have to be in mint cosmetic condition but good good mechanical condition.

This ad was originally posted on US Audio Mart US Audio Mart and the seller ships to the United States.


Canuck Audio Mart is FREE!

Forum Messages


Dealer News

Ad Stats

  • Last 48 hrs: 332
  • Active: 5193
  • Total: 647684

Replies Stats

  • Last 48 hrs: 575
  • Total: 1322139
    (since Nov 25th, 2004)