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Old 20th September 2006, 11:56 AM   #1
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Default What Solid State Amps with Output Transformer do you know of?

I found the following:
Nemesis: http://www.bonavolta.ch/hobby/en/audio/2sk135se.htm
Nemesis PP http://www.bonavolta.ch/hobby/en/audio/2sk135pp.htm
Zeus: http://www.susan-parker.co.uk/zeus-se-amp.htm

Are there more?

I'm looking for diy, of course, and maybe schematics of commercial amps.

Rüdiger
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Old 20th September 2006, 12:17 PM   #2
latala is offline latala  United Kingdom
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Old 20th September 2006, 12:30 PM   #3
ilimzn is offline ilimzn  Croatia
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Early Mac SS amps (MC250) uses an autoformer, Sansui BA5000 uses proper transformers...
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Old 20th September 2006, 12:37 PM   #4
SunRa is offline SunRa  Romania
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Nelson Pass ZV7
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Old 20th September 2006, 01:07 PM   #5
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Hi SunRa,

to my knowledge, the ZV7 works with kind of an 'Anode'-Choke so the output is not galvanically isolated. Do you know of a tweak?
Rüdiger
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Old 20th September 2006, 08:58 PM   #6
Sheldon is offline Sheldon  United States
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Quote:
Originally posted by Onvinyl
Hi SunRa,

to my knowledge, the ZV7 works with kind of an 'Anode'-Choke so the output is not galvanically isolated. Do you know of a tweak?
Rüdiger
Add an extra winding and you've got a transformer with isolation. The autoformer should give wider frequency response because you don't have to couple to the extra winding, though I don't know if the difference would be audible in all cases. The transfomer will give you isolation, so you won't fry speakers if your amp fries something.

Sheldon
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Old 20th September 2006, 09:26 PM   #7
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Altec 1594A rack mount mono sound reinforcement amp. Uses four 2N3055`s in PPP for 100 watts RMS out. Real output xfmer. 4-8-16 and 70V output taps. Uses two 2N3055 as drivers.
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Old 20th September 2006, 10:10 PM   #8
AndrewT is offline AndrewT  Scotland
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Hi,
Armstrong from the 70s.
Many 60s SS amps had transformer output.
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Old 20th September 2006, 10:32 PM   #9
latala is offline latala  United Kingdom
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The earliest Armstong the 400 series and the later 500 series
did not! feature an output transformer, but were a capacitor coupled amp that had no complimentary pairs at all in the power amp section . The first time i saw this was in an early HK
the Later 600 series was a conventional quasie output
There is no Armstrong with either a driver or output transformer
Rodgers did a series with driver transformers but no output
I have all these models in my amp collection !I feel I am 100% on this
regards Trev
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Old 20th September 2006, 10:43 PM   #10
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I ran across an early Electra that had output transformers... a very nice sounding amp, particularily when you consider its vintage.

Even new McIntosh amps have OPTs

dave
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