I'm trying to figure out the data sheet for the n34. The basic stuff is there but there are a bunch of blank columns. I don't know if the blank ones simply don't apply or what is going on. It says the heater is actually 13v, I assume that 12.6 is close enough to not affect performance, right?
Also, I can't find where I downloaded this file. Nor does it have any distinguishing titles on it, anyone have any idea what the whole publication was and/or know where to download this again? Thanks.
Also, I can't find where I downloaded this file. Nor does it have any distinguishing titles on it, anyone have any idea what the whole publication was and/or know where to download this again? Thanks.
From the terminology it looks like some pages from a Dutch or German data book.
My money is on Philips.
Jan
My money is on Philips.
Jan
This is a Marconi/Osram Output Pentode valve from circa mid 1930s.
Back in those days 13volts heater supply was the norm as was 6volts. We now call it 12.6v and 6.3volt. Oddly enough we still use 4volt and 2volt.
Here is some more data ... attached.
Taken from Thrower Radio Valve Data 1926 - 46
Back in those days 13volts heater supply was the norm as was 6volts. We now call it 12.6v and 6.3volt. Oddly enough we still use 4volt and 2volt.
Here is some more data ... attached.
Taken from Thrower Radio Valve Data 1926 - 46
Attachments
Thanks! Wonder how it will behave as a triode. I assume 250v 40ma would be a good place to start. I’ll probably fiddle around with them towards the end of the year.
It's Vademecum, isn't it??
Sure.
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Author Mikolajczyk, Piotr and Paszkowski, Bohdan
Publisher Pergamon Press & Wydawnictwa Naukowo-Techniczne, Poland Warzawa
Date of issue / Date of first publication 1960 / 1960
https://www.radiomuseum.org/lf/b/un...on-valves-and-semiconductor-devices_edition1/
You can still buy it New (PDF) or used.
It is not intended to be enough data to design from.
In the absence of an N34 data sheet, you could probably do worse than thinking of it as a direct-heated version of the N31. Vademecum shows similar transconductance, plate current and screen grid current, though the N31 is rated for 200V rather than the 250V of the N34. The operating conditions for the N31 may well be within the limits for the N34 and may be a good starting point for design - N31 data and curves start on page 84 of the Osram Valves 1936-1937 catalogue hosted on Frank Phillips tube data pages (here: https://frank.pocnet.net/other/Osram/index.html)
After doing a little more digging it looks like the n34 is pretty close to a 12v KT61 with the old 7 pin base. Does that sound about right?