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Dynaco ST-70 Series III

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Poll: ST-70 Series 3

This poll will
close on 6th June 2015 at 04:48 PM

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ST-70 Series 3

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What Hafler would have done today

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Today, 04:12 PM

#31

bear

expert in tautology

diyAudio Member

Join Date: Apr 2002

Location: New York State USA

And:

Hafler -
Perfecting hifidelity audio for over 60 years.

__________________
_-_-bear
http://www.bearlabs.com/
-- Btw, I don't actually know anything, FYI -- [...2SJ74
Toshiba bogus asian parts - beware!
]

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Today, 04:16 PM

#32

audioregen

diyAudio Member

Join Date: Oct 2010

Location: Vancouver, BC, Canada

Quote:

Originally Posted by SY

Not exactly unprecedented (see, for
example, tubes labeled Mullard, Genalex, Tung Sol, or Telefunken).
Or amps labeled Marantz.

Yes,
exactly. The thing is, when people see those names they are often
associated with the quality and reputation of the original offerings. In
most cases, the quality of the rebrands is nothing like the originals.
It's a marketing tool, and just not right, IMO.

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Today, 04:27 PM

#33

bear

expert in tautology

diyAudio Member

Join Date: Apr 2002

Location: New York State USA

Then there is this too, Jensen
Transformers:

ChurchProduction.com: Radial Engineering to Acquire Jensen
Transformers, Inc.

and this:

Hafler Amps return!

__________________
_-_-bear
http://www.bearlabs.com/
-- Btw, I don't actually know anything, FYI -- [...2SJ74
Toshiba bogus asian parts - beware!
]

Last edited by bear; Today at 04:29 PM.

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Today, 04:29 PM

#34

Bandersnatch

diyAudio Member

Join Date: Jul 2003

Location: Ann Arbor, MI

Quote:

Originally Posted by audioregen

The thing is, when people see those
names they are often associated with the quality and reputation of
the original offerings.

So, IOW it is
a Marketing plan of proven validity...not that I wouldn't prefer to live
in a world where it wasn't so...LOL

I'd also point out that it
bothers me that the OP has yet to provide any detail re. 'what Hafler
would have done today' with the design.

Given a reason to keep
something resembling the original topology, I'd be tempted to install a SS
device as the split load element. Then, why not go further; a cascode pair
of DN2540 would make a fine stand-in for a pentode. Or...why not go SS all
the way, and get rid of the tubes in favour of a cascode pair for each of
the finals.....reduce the B+, bias in Class A...and take the circuit from
Gary's 47 amps.
cheers,
Douglas

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