Interesting reading regarding the Hegeman transistor amplifier:
http://americanradiohistory.com/Archive-Radio-Electronics/60s/1963/Radio-Electronics-1963-07.pdf
http://americanradiohistory.com/Archive-Radio-Electronics/60s/1963/Radio-Electronics-1963-07.pdf
I am looking for a scematic for an ARENA Amplifier F210 , BUSH ARENA A220 , BUSH ARENA T224.
Jochem Schroeder eljosch@web.de
Jochem Schroeder eljosch@web.de
Hello, I have F220 schematic diagram, but I can't find a220 schematic diagram. I hope it can help you. At the same time, if you have a220, please upload it. Thank you. Have a good job,
in the meantime this URLs show internal details:
http://www.thevintageknob.org/kenwood-Supreme_1.html
https://www.ebay-kleinanzeigen.de/s...rio-supreme-1-verstaerker/2082309660-172-7984
https://zen.yandex.ru/media/iamhear/istoriia-accuphase-5c9c839a2a0ab400b4007038
https://www.hifiengine.com/manual_library/kenwood/supreme-1.shtml
http://e-hifi.pl/index.php?id=33
https://audiokarma.org/forums/index.php?threads/how-kenwood-and-accuphase-are-related.756964/
https://web.archive.org/web/2007082...intageknob.org/KENWOOD/SUPREME1/SUPREME1.html
how many pieces of this model was manufactured at those days ?
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It's so beautiful. I really want this antique machine. I don't know how much it costs?
Quite a few have been sold in northern Italy, I have found mine for very little money at a flea market. But of course, you buy "as is". Refurbished sets have other prices that I can't report because I look for untouched items.
"Sound" was a Japanese firm that was the actual maker of many Lafayette tube and transistor sets. Here is a very early solid state amp - I bet earlier than the Kenwood - that looks like a Lafayette tube model, has all germanium transistors, and phase splitting with transformers. Schematics on the last page.
seems to be one of the very first solid state version with SANYO power devices
https://www.radio741.com/39285-2sb4...-power-amplifier-germanium-sanyo-genuine.html
https://datasheetspdf.com/pdf-file/785272/Sanyo/2SB474/1
https://blog.goo.ne.jp/friendsofvalves/e/ce074bdc40c57304213660fc9b01fd6c
https://www.radio741.com/39285-2sb4...-power-amplifier-germanium-sanyo-genuine.html
https://datasheetspdf.com/pdf-file/785272/Sanyo/2SB474/1
https://blog.goo.ne.jp/friendsofvalves/e/ce074bdc40c57304213660fc9b01fd6c
links dead in the meantime - go to
https://web.archive.org/web/20101125050210/http://www.jedistar.com/jedistar amp dating_c.htm
(scroll down to cervin vega)
https://forums.stevehoffman.tv/threads/first-solid-state-amp-was-from-cerwin-vega-or-not.224460/
under
https://web.archive.org/web/2010071...pro-audio-home-audio-speakers-subwoofers.html
and
https://cerwinvega.com/about-us
I read this:
It was in 1957 that Vega introduced the world’s first solid state amplifier, rated at 125 RMS: it was a power house by the standards of its time.
The amplifier’s circuit was influenced by a 10,000-watt sonar amp Gene designed for Bendix Corp.
Where I can find more details ?
Actually Trio/Kenwood claims they did first commercial solid state amp in 1962 so earlier then Supreme 1.
In their doc I found only blurry small pic. Maybe someone recognizes it and can hint me with model name? For me design on that pic looks like something newer than 1962
Very interesting.
More details probably are to find in one issue of this magazine:
https://www.diyaudio.com/community/...en-yearly-index-from-1924-2009-wanted.161831/
Maybe a member from Japan can find out and upload this.
here several details concerning history of Trio-Kenwood:
https://audiokarma.org/forums/index.php?threads/kenwood-pre-and-post-accuphase.551162/
More details probably are to find in one issue of this magazine:
https://www.diyaudio.com/community/...en-yearly-index-from-1924-2009-wanted.161831/
Maybe a member from Japan can find out and upload this.
here several details concerning history of Trio-Kenwood:
https://audiokarma.org/forums/index.php?threads/kenwood-pre-and-post-accuphase.551162/
Reviewed some old magazines and found out that Transis-Tronics TECH S-15 or S-25 where sold year or two earlier (in 1960 or 61) than this Kenwood. Any way still looking for first Kenwood solid state amp.
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probably in the archived magazines from "wordradiohistory" are to find information in detail..
P.S.: thanks for the advice in post #194 - under
https://www.diyaudio.com/community/threads/tec-s-15-amp-1961-main-amp-schematics.203914/
are to find more details concerning this amplifier.
