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Stereo Amplifier SCA-35

Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 755566) Ampl/Mixer
 
Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 755568) Ampl/Mixer
 
Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 755569) Ampl/Mixer
 
Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 755632) Ampl/Mixer
 
Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 1118166) Ampl/Mixer
 
Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 1118167) Ampl/Mixer
 
Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 1118168) Ampl/Mixer
 
Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 1118170) Ampl/Mixer
 
Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 1118171) Ampl/Mixer
 
Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 1118172) Ampl/Mixer
Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 692483) Ampl/Mixer Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 692484) Ampl/Mixer
Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 692485) Ampl/Mixer Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 692486) Ampl/Mixer
Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 692487) Ampl/Mixer Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 692489) Ampl/Mixer
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Stereo Amplifier SCA-35; Dyna Co. Dynaco; (ID = 692483) Ampl/Mixer
Dyna Co. Dynaco;: Stereo Amplifier SCA-35 [Ampl/Mixer] ID = 692483 933x581
Select picture or schematic to display from thumbnails on the right and click for download.
For model Stereo Amplifier SCA-35, Dyna Co. (Dynaco); Philadelphia PA:
aus ebay, Verkäufer uncle-papa
 
Country:  United States of America (USA)
Manufacturer / Brand:  Dyna Co. (Dynaco); Philadelphia PA
Year: 1960 ?? Category: Audio Amplifier or -mixer
Valves / Tubes 8: 12AX7 12AX7 7199 7199 6BQ5 6BQ5 6BQ5 6BQ5
Main principle Audio-Amplification
Wave bands - without
Details
Power type and voltage Alternating Current supply (AC) / 120/240 Volt
Loudspeaker - This model requires external speaker(s).
Power out 35 W (unknown quality)
from Radiomuseum.org Model: Stereo Amplifier SCA-35 - Dyna Co. Dynaco; Philadelphia
Material Metal case
Shape Book-shelf unit.
Dimensions (WHD) 13.5 x 4 x 11 inch / 343 x 102 x 279 mm
Notes Integrated Amp; with Center Speaker output.

Model page created by Gottfried Silberhorn. See "Data change" for further contributors.



All listed radios etc. from Dyna Co. (Dynaco); Philadelphia PA
Here you find 22 models, 21 with images and 13 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


 


Forum contributions about this model
Dyna Co. Dynaco;: Stereo Amplifier SCA-35
Threads: 1 | Posts: 3
Hits: 261     Replies: 2
Dynaco amplifier SCA-35 output transformer details
Meyer Rochwerger
08.Jan.20
  1

Dear friends,

I bought a Dynaco SCA-35 amplifier missing both output transformers (type Z535).
 

So I need to build a new pair of transformers from scratch due to the high values of transformers that are for sale on the web plus the high postal rates for Brazil.


Searching the web, I found some characteristics of the windings: 

The primary has 8000 ohms CT to plate 

But the information about screen winding (CT to screen) is missing.


If anyone has this information to provide me so that I can proceed to the work.

I'd be very grateful..

Greetings,

Meyer

Achim Dassow
09.Jan.20
  2

Dear Meyer,

under w w w.triodeelectronics.com/z517wadyoutr.html you could find more about the UL taps:

...comparison of our Z565-48 to the original Dynaco Z565...
...at high frequencies the noise/THD of the amplifier is greater than that of the transformer:
the actual bench tested distortion figures at full power (17.5 watts) for the transformer itself are as follows: 1KHz 0.019%, 10 KHz 0.032% 15 KHz 0.029% 30 KHz 0.048% 40 KHz 0.058 %.
This is practically within the measuring margin of error the same as of the original Dynaco unit.

The UL taps are at 25%, per Dynaco spec for this output.

Here's a similar comparison of the original Dynaco, Magnequest, Handwound, and two models of Hammond transformers ...
Note in particular the comparison between the Dynaco part and the Hammond 1650F, comparably priced to our unit.
Transformer specs are: 8000 ohms CT primary with screen taps, 4 & 8 ohm secondary.
20 Hz to 20 KHz response at 17.5W, within 1 db (30-15 KHz @ 35W)
Max DC per side (suggested) 80 ma.
Height 3 inches (75 mm) width 2 1/2 inches (63 mm), depth over covers 3 1/8 inches (80 mm), mounting centers are 2 inches (52 mm) by 2 1/4 inches (55 mm).

I hope this could help you to successfully build the transformers.

Regards
Achim

Meyer Rochwerger
09.Jan.20
  3

Dear Achim,

A colleague from the "dynacotubeaudio" forum provided me with the information I needed.

"Typically the ultra-linear screen taps are at 35-40% of the output transformer primary" (he said...)

Now I can proceed with my project ...

Anyway thank you for your interest in helping me.

 

Greetings,

 

Meyer

 
Dyna Co. Dynaco;: Stereo Amplifier SCA-35
End of forum contributions about this model

  
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