What Solid State Amps with Output Transformer do you know of?

Onvinyl · 20th September 2006, 11:56 AM

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

latala · 20th September 2006, 12:17 PM

The quad 50 e springs to mind 50 watts
regards trev

ilimzn · 20th September 2006, 12:30 PM

Early Mac SS amps (MC250) uses an autoformer, Sansui BA5000 uses proper transformers...

SunRa · 20th September 2006, 12:37 PM

Nelson Pass ZV7

Onvinyl · 20th September 2006, 01:07 PM

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

Sheldon · 20th September 2006, 08:58 PM

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

rcavictim · 20th September 2006, 09:26 PM

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.

AndrewT · 20th September 2006, 10:10 PM

Hi,
Armstrong from the 70s.
Many 60s SS amps had transformer output.

latala · 20th September 2006, 10:32 PM

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

planet10 · 20th September 2006, 10:43 PM

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

20th September 2006, 11:56 AM	#1
Onvinyl diyAudio Member Join Date: Aug 2002 Location: Germany	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 __________________ "I can feel what's going on inside a piece of electronic equipment. I have a sense that I know what's going on inside the transistors." Robert Moog

20th September 2006, 01:07 PM	#5
Onvinyl diyAudio Member Join Date: Aug 2002 Location: Germany	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 __________________ "I can feel what's going on inside a piece of electronic equipment. I have a sense that I know what's going on inside the transistors." Robert Moog

20th September 2006, 09:26 PM	#7
rcavictim diyAudio Member Join Date: Jun 2004 Location: Cool end of a soldering iron NW of Toronto	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. __________________ I.Q.Test. Have you ever purchased a recreational snowmobile?

20th September 2006, 10:10 PM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, Armstrong from the 70s. Many 60s SS amps had transformer output. __________________ regards Andrew T.

20th September 2006, 10:43 PM	#10
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	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 __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA


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20th September 2006, 12:17 PM	#2
latala diyAudio Member Join Date: Feb 2006 Location: staffordshire	The quad 50 e springs to mind 50 watts regards trev

20th September 2006, 12:30 PM	#3
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	Early Mac SS amps (MC250) uses an autoformer, Sansui BA5000 uses proper transformers...

20th September 2006, 12:37 PM	#4
SunRa diyAudio Member Join Date: Aug 2004 Location: Romania	Nelson Pass ZV7

20th September 2006, 10:32 PM	#9
latala diyAudio Member Join Date: Feb 2006 Location: staffordshire	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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