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
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.
Akai AA810, most if not all Luxor stereos, Luma.
There must be much more models - here an example:
CA202 Nytech post #10
Typical power amp topology:
Black Devil (Gerhard Haas, ELRAD, Experience Electronics) post #39
Please let me know more - thank you
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
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.
My (quite old) Sansui 800.....:)
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.
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.
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