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1. The new STAINLESS STEEL chassis is identical in size, shape and markings to the older original nickel plated steel frame. 
   This upgraded chassis is NON-MAGNETIC and removes any magnetic interference effects of a steel chassis on the audio circuitry.
 
2. The new USA made power transformer has a higher stack lamination than the original Dynaco power transformer and is rated 
   for 120 volts instead of 115 like the old design. The two tube heater legs are rated for 5 amps each instead of 3 amps each 
   like the old design. This beefed up transformer (which has a bottom plate like the original PA-060 to prevent EMI from 
   the transformer from reaching the audio circuitry) allows the use of KT88 output tubes in place of the EL34 tubes for 
   a slightly different tonal presentation. Four heavy duty neoprene isolation mounts are used to attach the transformer to the chassis.
 
3. The A-470 output transformers are brand new USA made custom production transformers. They use the same interleaved/layer winding 
   technique as the original cloth lead A-470's and incorporate the same high quality M-6 grain oriented laminations. 
   They are dimensionally accurate to the original design and have a durable heat resistant black epoxy finish.
 
4. The old stock 30, 20, 20, 20 electrolytic quad cap which had marginal storage capacity for this amp has been replaced by 
   a 80, 40, 30, 20 quad cap for almost double the power storage capacity.
 
5. The upgraded VTA driver board uses three new 12AT7 triodes in place of the two mediocre sounding 7199 pentode/triode tubes. 
   Dynaco saved money using a two tube 7199 board design but made some serious compromises in sound quality.  
   The older ST-70 design had one bias control for each channel whereas the VTA board has a separate bias control for each of 
   the four output tubes. This design allows for individual adjustment of each output tube bias. 
   Matched pairs or quads of output tubes are not necessary with this design. 
   Eight quality Sprague 716P "orange drop" coupling caps are included with the board.
 
6. The input jacks are gold plated and have a wider spacing to allow for newer design thicker interconnects.
 
7. The output jacks are modern gold plated 5 way binding posts.
 
8. The 7 octal tube sockets are modern high quality Micanol sockets with cadmium plated pins. 
   These sockets are very durable and more reliable than the older stock phenolic tube sockets found in the original amps.

9. Includes two triode/pentode switches to allow switching between these two modes of operation. 
   The switching may be done while the amp is running to compare the two sonic presentations.


 

brand NEW ST70 amplifiers, in KIT or ready to go!

"Shipping costs will be invoiced separately - 36 pounds from zip code 01566 by UPS ground"

Triode/pentode kit as used on the VTA ST-70 pictured above. This kit may be added to any VTA board driven Dynaco ST-70
to allow your amp to operate in either the normal pentode ultralinear mode or at the flick of the switch
in the sweet sounding triode mode. Simply remove the old bias pots and install the switches in the empty 3/8" holes.
Note - Kit cannot be installed in a stock amp which still uses the old original bias controls. Comes with all parts and instructions.
$39 with FREE First Class mail delivery in the USA.

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here's a great photo of the internal wiring on Bob's VTA70 amps, with the Triode/Pentode switches . . .

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you can send email to Bob Latino directly here for info on these complete kits or amps . . .