Did Siemens ever publish data for their own D3A ?

Hearinspace · 13th October 2009, 06:45 PM

Most of the D3A's out there now are Siemens yet there doesn't seem to be any data produced by Siemens themselves. There are sheets by Philips and Telefunken but they differ. Anybody got a Siemens pdf lurking on their hard drive?

RE 604 · 13th October 2009, 07:31 PM

In my Siemens Tube Pocketbook from 1960 is only the amplification factor different from the TFK data , 85 Siemens to 80 TFK and Philips .
My great Siemens Handbook 1963/64 is without D3a .

HollowState · 13th October 2009, 09:11 PM

My Siemens 1963 "Special Quality Tubes" has 12 pages for the 7721 which I believe is the same tube. The problem is that I don't have a scanner and would have to break the binding to get it to lay flat. It even has triode curves.

Hearinspace · 13th October 2009, 09:23 PM

Thanks 604. I was looking at the pages for triode connection. The Telefunken curves are considerably better than the Philips, which makes me wonder where the Siemens stand in relation. I was hoping I wouldn't have to do my own curves for them.

HollowState, thank you too! I didn't think of Siemens and the 7721 together . It's the triode curves I'm after.

13th October 2009, 06:45 PM	#1
Hearinspace diyAudio Member Join Date: Jun 2008	Did Siemens ever publish data for their own D3A ? Most of the D3A's out there now are Siemens yet there doesn't seem to be any data produced by Siemens themselves. There are sheets by Philips and Telefunken but they differ. Anybody got a Siemens pdf lurking on their hard drive?

13th October 2009, 07:31 PM	#2
RE 604 diyAudio Member Join Date: Oct 2003 Location: Germany	In my Siemens Tube Pocketbook from 1960 is only the amplification factor different from the TFK data , 85 Siemens to 80 TFK and Philips . My great Siemens Handbook 1963/64 is without D3a . __________________ No reason to get excited : Jimi Hendrix .

13th October 2009, 09:11 PM	#3
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	My Siemens 1963 "Special Quality Tubes" has 12 pages for the 7721 which I believe is the same tube. The problem is that I don't have a scanner and would have to break the binding to get it to lay flat. It even has triode curves. __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

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13th October 2009, 09:23 PM	#4
Hearinspace diyAudio Member Join Date: Jun 2008	Thanks 604. I was looking at the pages for triode connection. The Telefunken curves are considerably better than the Philips, which makes me wonder where the Siemens stand in relation. I was hoping I wouldn't have to do my own curves for them. HollowState, thank you too! I didn't think of Siemens and the 7721 together . It's the triode curves I'm after.

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