input voltages

knowledge base for the classic Dynaco ST70

input voltages

Postby jcm2555 » Sun Jan 03, 2010 2:31 am

Hi im very interested in purchasing an older ST 70 of ebay and doing it up so I can have a nice power amp for home, but cant seem to find what the input voltage’s are.

My question is can the ST 70 be run on a 230/240 50hz vac supply
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Postby TerrySmith » Sun Jan 03, 2010 3:27 am

NO! About 99.9% of ST70's were 115v 60hz. You will need a PA-521 transformer from Triode or Dynakitparts, it has dual primaries and is rated for 50hz.
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Postby Sal Brisindi » Sun Jan 03, 2010 10:48 pm

You can also use a step down transformer rated at 3 amps on the 120 volt side or a variac, but that can be dangerous if someone would turn the knob the wrong way...

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Postby Geek » Sun Jan 03, 2010 11:51 pm

Sal Brisindi wrote:You can also use a step down transformer rated at 3 amps on the 120 volt side or a variac....


Eeeek! NO!

The PA-060 runs hot enough on 60Hz. 50Hz will be a fire hazard!

Cheers!
-= Gregg =-
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
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Postby Sal Brisindi » Mon Jan 04, 2010 6:49 am

I didn't think of that...
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