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Have some of those old German Post tubes and I'm thinking to add another SET amp to my collection. Those tubes are made for telephony like WE101D, 102D etc. which I used in the 500 mW Geiru Chan. The linearity is superb and life is believed to be around 50.000 hours, like 101D etc.
The Da's output is 1 W which is enough to drive the biamped Avantgardes.
The driver could be Ca or one of the other similar post DHT's.
But.... I need a schematic. Never seen any, they were probably kept secret due to WW1. But there must exist some amps and schematics somewhere in Germany.
If I provide the data of the tubes, can somebody here take the challenge to suggest a suitable driver for the Da? Just a coarse estimation is what I need. Any?
Best regards, Johnny.
Follow Ups:
some pictures
http://www.ebay.com/itm/AudioCollections-Lab-Siemens-DA-tube-amplifier-mono-block-x-2-MINT-condition-/291226050153?ssPageName=ADME%3AX%3ARTQ%3AUS%3A1123&nma=true&si=VrLJXQA2SnzKbawljbD5EtXWbM0%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
Do you know Dhtrob projects?
https://www.dhtrob.com/projecten/_nl.php
Yes, I know the interesting pages of DHTROB and his schematic of the Ca/PX25 amplifier.
I have the oldest versions of Ca, and the superior DET5, which is the prototype and predecessor of NT40 which again is the military equivalent to the PX25.
Other designations like CV1040, VR40 and other are used.
But I want to use the Da output tubes, and a schematic with that scarce tubes are impossible to find. May be they don't exist.
Or may be our German friends can help?
Best regards,
Johnny
http://www.mif.pg.gda.pl/homepages/frank/short/054/0/092.pdf
Have a look at vt52.com for inspiration
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