2N3055 inside - commercial famous amplifier models, quasi complementary power output

[tiefbassuebertr]

OOOOoooooh! , very nice collection. A couple of Delco (I think they did silicon) and GE types would round it out a bit. BTW a couple of Matsushita 2N3055s (as used in NAD 3020etc from an earlier posting) will amaze!
regards

really? I cannot believe this. The brand logo from Motorola and Matsushita are not identical, but similar.
In the attachement NAD3020 with 2N3055 from various brands.
BTW - to find out the first solid state audio components in general I have start this thread:
http://www.diyaudio.com/forums/soli...id-state-audio-amplifier-components-want.html
But the really first commercial amp (or receicer?), where 2N3055 is in use, is also still wanted.

 

[Ian Finch]

Tief,
Have a look at Mosquito's post #17. Actually, Matsushitas stick out because the black branding occupies half of the cover. This was so on two 3020s that I have repaired and on a later 703...? receiver that I did not succeed with and lies somewhere in the garden shed. I replaced at least one of them, however.
regards

 

[tiefbassuebertr]

Tief,
Have a look at Mosquito's post #17. Actually, Matsushitas stick out because the black branding occupies half of the cover. This was so on two 3020s that I have repaired and on a later 703...? receiver that I did not succeed with and lies somewhere in the garden shed. I replaced at least one of them, however.
regards

...and post #18 and then my post #56. As I know, also black anodized 2N3055 versions was available from Toshiba, as to see in the attachement by very old germanium versions. Bu I am not sure absolutely.

Now I understand, why it is very hard to find the realy first solid state amps equipped with 2N3055; most of the brands in the United Sates uses only power output transistors with their own factory number like Motorola's power device 132-070 for McIntosh = Industry standart 2N5303 (see attachement)
So I need a list with all exist custom factory part No (at least 50 different in unse) for the 2N3055 to find the first amp models with this.


BTW - complete service manual of MC250 you will find there
6th Street Bridge: McIntosh MC-250 update
or there
http://www.berners.ch/McIntosh/Downloads/MC250_own.pdf

 

[tiefbassuebertr]

First German Receivers 2N3055 inside: Wega "142" and "144" from 1968

Wega receivers (AM/FM tuner include power amp) model "142" and "144", introduced 1968, uses the 2N3055 in it's power output stages. The "142" is a version in mono with loudspeaker on board (5W output power) and the "144" in stereo. Only from the "142" some pics in the attachement.
I don't know about an earlier model on the German marked, that was equipped with 2N3055 in the output power stage - because germanium types like AD149 in that time much more cheaper.

 

[tiefbassuebertr]

CARPTENTIER's Receiver Carad 2001/Thorens 1250 4xSiemens BD130

CARPTENTIER's Receiver Carad 2001/Thorens 1250,
equipped with BD130, the Siemens TO-3 version of RCA's 2N3055
hard to find and new for me until now. Here some URLs and PDF photos:
Belgischer Bolide - ..:: Bandmaschinen - Forum ::..
CARAD ist CARPENTIER aus Belgien
ebay item No 330418109984

 

[tiefbassuebertr]

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

Link is in the meantime death but about
AMPLIFICATORE DA CASA STEREO RCF AF 6070 MADE IN ITALY su eBay.it Amplificatori, Hi Fi e Home Theatre, Audio, TV, Elettronica
I have found the same auction (second offer). Because the photos after two or three months would be deleted again, I have save the photos and the ebay members as PDF attachement. Can you contact the new owner about ebay and ask them, if he can make any internal photos and send to you for posting here? Online there are no information and photos available about this amp. Thank you very much

 

[tiefbassuebertr]

In New Zealand about 1970, several models of the locally built "Fountain" brand amplifiers used 2N3055 transistors. My first amp was a Fountain 1550. I traced the power amp circuit, it was similar to the J Linsley Hood designs popular about that time.

also a "hard to find" model (only by chance):
Fountain Amp repairer - AudioEnz Forums
FOUNTAIN AMP AF1550 for sale - TradeMe.co.nz - New Zealand
I save the photos in the attached files. Have you are a schematic?

 

[Orit]

AFAIK, the Grundig RTV 600 receiver, released in 1967, had 4 2N3055 output tansistors as standard equipment. They had the old style RCA logo !

 

[tiefbassuebertr]

AFAIK, the Grundig RTV 600 receiver, released in 1967, had 4 2N3055 output tansistors as standard equipment. They had the old style RCA logo !

yes - thank you

Aufbereitung eines Klassikers: Grundig RTV 600, Hifi-Klassiker - HIFI-FORUM
RTV600 (RTV 600) Radio Grundig (Radio-V

I still want to know the first commercial products equipped with 2N3055.
I have heard, that the same die was also inside by the types 40636 (also RCA, selected 2N3055 for higher secondary breakdown voltage), BDY39 and BD130 (Siemens, Germany). But I think, this types was later released.
I have found cover pics from old RCA data books from 1961-1962 (see attachement). It would be interesting to know, whether there the 2N3055 already mentioned.

 

[Edmond Stuart]

Starting in 1962, my (semi) commercial amps were equipped with four 2N3055 from Bendix. I sold tens of them, mainly to my fellow students. Later these amps were sold as "de Vries 2x27Watt", and were equipped with RCA trannies. A description can be found in Elektuur (now Elektor), Jan. 1969, p. 126.

 

[tiefbassuebertr]

interesting advices. The first elektor magazine from German was launched Mai 1970. Are you sure, that the Dutch version already present in Jan 1969?

You say Later these amps were sold as 'de Vries 2x27Watt'
What means "later"? Already in 1963 or 1964?

About post #64 you will find the first me known product on the German marked equipped with 2N3055

 

[Edmond Stuart]

"Elektor is a monthly magazine about all aspects of electronics, first published as "Elektuur" in the Netherlands in 1960, and now published worldwide in many languages including English, German, Dutch, French, Greek, Spanish, Swedish, Portuguese (native and Brazilian) and Italian with distribution in over 50 countries. The English language edition of Elektor was launched in 1975 and is read worldwide."

 

[tiefbassuebertr]

thank you very much for this advice. I know all this except the fact, that the Netherlands version "Elektuur" already exist 10 years before release the first German edition from 1970 (I have it all from 1970 until december 2009 except any few editions between 1970 and 1976).
I haven't success to find "Elektuur" editions before 1970 on the web.
about
http://www.circuitsonline.net/forum/view/75300/13
I have found a Dutch guy with collection start at 1970
and about
http://www.gloeidraad.nl/radioforum/index.php?id=61550
some other magazines from your country
What do you think, how many "Elektuur" editions between 1960 and 1970 are exist?

 

[tiefbassuebertr]

supplement to post #65:
Thorens 2000 / Carad versterker PAS64 en FM tuner T67

regarded old elektuur versions I have find out about
Radio Journaal
the formerly name: "Elektronica Wereld"
unfortunately the follow photo URL's don't goes open at my pc station, also not about the webarchive:
http://84.87.34.146/Diverse/RadioDocs/Elektuur-nov1964.jpg
http://84.87.34.146/Diverse/RadioDocs/Elektuur-nov1964-fr.jpg
http://84.87.34.146/Diverse/RadioDocs/Elektuur-okt1964-fr.jpg

 

[tiefbassuebertr]

Supplement to post #12 and #48 (Dynaco 120) - Repair Kit

Dynaco 120 Retrofit capacitor kit: ebay Item number:160438078431

 

[tiefbassuebertr]

Dynaco Pre-Amp PAT-4 and Power-Amp ST-80

also a nice chain and interest circuit:

 

[tiefbassuebertr]

ELA Power Amp Dynacord "DEM-286" and Telefunken V665 ("V 665")

The Dynacord amplifier without global NFB and driver transformer and output transformer works with 2x TDA2030 for driving a very fat driver transformer "DCN 309272". This one drive a push pull darlington pair that consists of one 2N6487 and three parallel switched 40636 from RCA for each half (40636 = 2N3055 with higher value for Vceo).
Instead the six emitter resistors there are six primary windings of a big fat output transformer "DCN 330775". The detailled circuit you will get from Dynacord as PDF file. The circuit description is to find in the German Magazine "Funkschau" number 3 from the year 1984. page 41.
Here some URLs from this model and related other models probably with similar schematic:
http://www.ela-online-shop.de/files/DEM286.pdf
2 x DYNACORD DEM 286 Verstärker ENDSTUFE 200 WATT bei eBay.de: PA-Verstärker Endstufen (endet 02.06.10 12:29:30 MESZ)
http://www.ela-data.de/PDFs/DEM285.pdf
http://www.ela-data.de/PDFs/DEM289.pdf
http://www.ela-data.de/PDFs/DEM287_288.pdf
Basicly great similarity with the topology of
http://www.susan-parker.co.uk/
After certainly modifications (especially after remove the frequency low/high pass limitations) this could be a ultimate sounded home hifi power amp. I like such designs, because it is easy to get a symmetric signal behaviour.

About the Telefunken model (ELA power amp) "V665" with 250W output power no pics and information online at this time (auctions from ebay unfortunately always deleted after 3 months).
in the German magazine Funkschau Number 8 from the year 1974 you will find a detailled circuit description from page 251 to 254 about this model.

BTW the term ELA is the German abbreviation for "Public Address" (PA)
and stands for Elektroakustik (electro acoustic)
But in New High German colloquial usage this terms no longer the same;
Ela means that the application was improved for voice transmissions without music, i. e. only spoken/lecture, while PA means that the application has been optimized for music live events on stage (music open air or indoor concerts).

 

[tiefbassuebertr]

SABA STUDIO III and "Studio 8120" STEREO Receiver

HiFi-Studio III Stereo (3 Stereo) Radio SABA; Villingen
http://www.fertinger.com/index.php?option=com_content&task=view&id=345&Itemid=374
and
ebay item No 230469044624, 160411226983 and 270583281955
Explicite description in German's Magazine "Funkschau" 16/1967, page 499-500 (Studio III) and 16/1970, page 549-552 (8120 part I) so as 17/1970, page 588-590 (8120 part II)

 

[tiefbassuebertr]

Vox Supreme equipped with cascoded 2N3055 and transformer to drive it (however OTL)

detailled very fine photo documentation while performing the restauration work (complete strip down and rebuild).
Vox Supreme
Home

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[tiefbassuebertr]

Leak Stereo 30 and Stereo 30 plus - supplement to post #54

First launched 1963 - this could be realy one of the very first SS amps equipped whith 2N3055