Line-up (Overview) of Vintage Receiver Models with AC Speaker Output (not DC) wanted - diyAudio
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Old 29th July 2012, 06:23 PM   #1
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Default Line-up (Overview) of Vintage Receiver Models with AC Speaker Output (not DC) wanted

I am looking for an URL, where are listed all vintage stereo AM/FM receiver so as vintage integrated amps/power amps, which have no DC coupled (resp. no direct coupled) loudspeaker outputs (i. e. a serial capacitor between output and speaker terminal).
Serial capacitors are in use more like in older models, the newer ones have often been changed to symmetrical voltage suooly and direct coupled speaker output. An example is the Marantz 2230 (AC coupled output) and its successor 2230B with DC output (see attachment)
Pioneer, Kenwood, Sansui and much others really should also have such devices built. The SX300 is an additional example - have a look to the pics from
http://www.hifi-forum.de/viewthread-84-11738.html
The great advantage is the possibility, to replace the caps in series to the speakers against precisely tailored values for getting best sonic results in the lower frequency aera (also in order to the corresponding loudspeaker allocation - e. g. sometimes near by the wall and sometimes not) and the absence of serial contacts from relays for DC protect. This is not easy to reach with DC speaker outputs.

Who can send me an advice for such URLs??
in the attachment you will find another example from the Marantz 1060
Thank you for your advices.
Attached Images
File Type: jpg Marantz 2220.jpg (121.4 KB, 184 views)
File Type: jpg marantz-2220B - direct coulped (DC) output.jpg (23.6 KB, 178 views)
File Type: jpg Marantz 1060.jpg (103.3 KB, 178 views)
File Type: jpg marantz 1060_2nd_ 006.jpg (204.0 KB, 176 views)
File Type: jpg Pioneer SX300.jpg (351.3 KB, 179 views)
File Type: jpg Pioneer SX300T.jpg (133.0 KB, 60 views)

Last edited by tiefbassuebertr; 29th July 2012 at 06:32 PM.
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Old 29th July 2012, 06:28 PM   #2
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Akai AA810, most if not all Luxor stereos, Luma.
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Old 13th December 2012, 05:23 PM   #3
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Quote:
Originally Posted by Tekko View Post
Akai AA810, most if not all Luxor stereos, Luma.
thank you.
There must be much more models - here an example:
CA202 Nytech post #10
Your opinion about this schematics?

Typical power amp topology:
Black Devil (Gerhard Haas, ELRAD, Experience Electronics) post #39
Your opinion about this schematics?

Please let me know more - thank you
Attached Images
File Type: jpg AKAI AA-810 Front.JPG (850.6 KB, 47 views)

Last edited by tiefbassuebertr; 13th December 2012 at 05:43 PM.
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Old 14th December 2012, 01:09 AM   #4
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Many of the old Marantz 22XXb models used output capacitors and were some fine sounding amps. Example being 2215b. Marantz 2215B | Owners Manual, Service Manual, Schematics, Free Download | HiFi Engine

Click the image to open in full size.

Last edited by jerluwoo; 14th December 2012 at 01:24 AM.
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Old 14th December 2012, 01:35 AM   #5
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TANDBERG TR1000 series is a good example. Also the tiny good TR200. But I believe You want som pictures too?
Well, if I get the time I will provide such.
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Old 14th December 2012, 01:45 AM   #6
wahab is offline wahab  Algeria
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My (quite old) Sansui 800.....
Attached Images
File Type: jpg SANSUI800.jpg (855.8 KB, 33 views)
File Type: jpg Sansui800A.jpg (823.7 KB, 40 views)
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Old 14th December 2012, 08:34 AM   #7
Orit is offline Orit  Italy
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And then I would like to remind of that particular configuration used by Grundig for the RTV350/360/370/380 receivers in the late sixties. Those were not hifi (less than 10 watts per channel) but for background home music and were installed in wooden radiograms.

In those sets, the capacitor is between the output center and ground, and the speakers are connected directly between the collector of the "upper" transistor and ground.
In this configuration, a separate secondary, rectifier and reservoir capacitor was needed for each channel.

The advantage for all this complication seems to be avoidance of power-on and power-off thumps.
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Old 14th December 2012, 08:35 AM   #8
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Quote:
Originally Posted by wahab View Post
My (quite old) Sansui 800.....
Quote:
Originally Posted by TANDBERGEREN View Post
TANDBERG TR1000 series is a good example. Also the tiny good TR200. But I believe You want som pictures too?
Well, if I get the time I will provide such.
Thank you.
Tandberg TR-200 overhaul | Flickr - Photo Sharing!
Tandberg TR-1000 - garmonizer - Photo.Qip.ru / id: val
I have save some images from "hard to find" Grundig' RTV250 from already deleted auction URLs (found by google image search).
The Grundig RTV350 was those device, where I have first time listening stereo sound (a radio play by a German radio station - NDR if I recall right in the year 1967). It was very interesting to hear, as a train from left to right drove past.
Attached Images
File Type: jpg Grundig RTV250 dial tune.jpg (7.8 KB, 25 views)
File Type: jpg Grundig RTV250 operating area.jpg (9.2 KB, 10 views)
File Type: jpg Grundig RTV250 rear.jpg (9.6 KB, 11 views)
File Type: jpg Grundig RTV250.JPG (15.1 KB, 11 views)

Last edited by tiefbassuebertr; 14th December 2012 at 08:55 AM.
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Old 2nd January 2013, 06:52 PM   #9
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Default Harman-Kardon 330A, 330B

Harman-Kardon 330A, 330B (and not speaker DC coupled 330C)
Le forum Audio Vintage • Afficher le sujet - Harman-Kardon 330B
Harman Kardon Stereo Receiver Model 330A
http://www.harmankardon.com/resource...ual/330BOM.PDF
HARMAN KARDON 330B SM Service Manual free download, schematics, eeprom, repair info for electronics
Harman Kardon 330C restoration - AudioKarma.org Home Audio Stereo Discussion Forums
Attached Images
File Type: jpg Harman Kardon 330A front.jpg (71.5 KB, 8 views)
File Type: jpg Harman Kardon 330B front left.jpg (61.7 KB, 4 views)
File Type: jpg Harman Kardon 330C front.jpg (11.3 KB, 6 views)
File Type: jpg Harman Kardon 330B open - component side.jpg (154.1 KB, 16 views)
File Type: jpg Harman Kardon 330B open - solder site.jpg (16.0 KB, 15 views)

Last edited by tiefbassuebertr; 2nd January 2013 at 06:56 PM.
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