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In Reply to: RE: Dynaco MKIII tube amp posted by DanS on January 04, 2017 at 20:52:33
Not familiar with him. Heard of him but not references. If you are concerned why not consider a brand new MKIII for a few bucks more. One that is even better than the original. Better iron, new sockets, everything!!!
Follow Ups:
I'm wondering how you determined that? Did you measure original A-431 output transformers and compare them against the VTA offerings?
I'm not one to insist that all old Marantz, Fisher, Eico, Dynaco, etc. iron is always better than what is wound today, but I'm curious how you're apparently so sure the VTA iron is "better".
Thanks.
Ok the Power tranny is a little beefier but the outputs are about the same. Here is the quote off Bob's page.
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.
When people talk about tube amps, the term "iron" is generally used to describe the output transformers, and "power transformer" is used to describe the power transformer.
My intent isn't to disagree regarding semantics, but I felt your statement about "better iron" could be misleading, especially to someone like the original poster who seems to be new at this.
And, as petercapo has already stated, the poster was asking about the MKIII amps, where the power transformers are acceptable.
...this thread is about the Mark III, not the Stereo 70. There wouldn't be room on the Mark III chassis for bigger transformers. Fortunately, the original Mark III transformers are fine as they are.
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