2N3055 inside - commercial famous amplifier models, quasi complementary power output - diyAudio
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Old 27th December 2009, 05:30 PM   #1
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Default 2N3055 inside - commercial famous amplifier models, quasi complementary power output

The 2N3055 power transistor was introduced by the Radio Corporation of America (RCA) in the early 1960s. It was one of the first silicon power transistors, offered unrivalled second breakdown immunity and found many applications particularly in audio power amplifiers.

About
Amplifier based on 2N3055
there is a circuit collection

I want to have a bunch of such commercial famous power amplifier models and UK/US brand names made in the 1960s (only with quasi complementary output stages).

Thank you very much for your hints.

Last edited by tiefbassuebertr; 27th December 2009 at 05:33 PM.
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Old 27th December 2009, 08:13 PM   #2
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Maplin did a 225WRMS complimentary amplifier in the 1970;s.
I used one for disco work and it was very loud and very reliable.
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Old 27th December 2009, 09:30 PM   #3
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Quote:
Originally Posted by nigelwright7557 View Post
Maplin did a 225WRMS complimentary amplifier in the 1970;s.
I used one for disco work and it was very loud and very reliable.
this brand (not the showed module) ??
200W Power Amplifier : Audio Amplifier Kits : Maplin
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Old 27th December 2009, 09:43 PM   #4
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Hi Tiefbassuebertr.
Check out on this auction
Rcf af 6070 su eBay.it Amplificatori, Hi Fi e Home Theatre, Audio, TV, Elettronica
Works at 70 V supply ,very well engineered , the design is a plus .
I saw also a more powerful version ,too ,also larger cabinet ,but this one sounds very good . The add is not mine !!!
Bye
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Old 27th December 2009, 09:45 PM   #5
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Quote:
Originally Posted by tiefbassuebertr View Post
this brand (not the showed module) ??
200W Power Amplifier : Audio Amplifier Kits : Maplin
It was 225WRMS, they no longer do it.
Shame it was a good solid amp.
I am sure i have seen a picture of it on this forum at some time.
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Old 18th February 2010, 05:11 PM   #6
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here very fine sounded receiver with 2N3055 as power devices:
Braun series "Regie"
Attached Images
File Type: jpg Braun Regie550 open.jpg (122.8 KB, 6077 views)
File Type: jpg Braun.jpg (18.6 KB, 5877 views)
File Type: jpg Braun_regie_510.jpg (40.6 KB, 5810 views)
File Type: jpg regie350-6.jpg (47.9 KB, 5700 views)
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Old 18th February 2010, 07:15 PM   #7
mjf is offline mjf  Austria
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hello.
from elektor:
edwin, equa and equin - power amps in the seventies.......
harman kardon (citation)........
grüsse
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Old 18th February 2010, 07:37 PM   #8
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Quote:
Originally Posted by nigelwright7557 View Post
It was 225WRMS, they no longer do it.
Shame it was a good solid amp.
I am sure i have seen a picture of it on this forum at some time.
I remember it though i never bought one

It used MJ2955 as the pnp compliments & a +/-55V approximately power supply. Lord knows how it didn't blow up as you can see the rail voltages were well in excess of the VCE of both the 2N3055 & the MJ2955. I guess they were relying on the reverse biasing of the output transistors to stop them exploding

60V transistor, 110V PSU
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Old 18th February 2010, 07:42 PM   #9
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The CM Labs 911 was among the very first commercially built solid state amps that made the unheard of power output of 100wRMS. It is a quasi complementary output stage with a big cap blocking DC. Nice amp actually.

The other amp of the day, that was also quasi complementary was of course the Dyna ST-120.

There really were not a lot of powerful solid state amps before 1970.

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Old 18th February 2010, 08:26 PM   #10
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Quote:
Originally Posted by event horizon View Post
60V transistor, 110V PSU
Back in those days, lots of amp makers would cheat by putting 2N3055's, 2N3772's etc. on a curve tracer and see if they took the 100+ volts they needed. The epitaxial versions usually would (now they just call it an MJ15015).
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