GU50 plate curves

Kay Pirinha · 4th June 2012, 05:36 PM

Hi,

does anyone of you know a source of GU50 plate curves at a screen voltage of 300 volts? Any sheet of LS50, EL152 and GU50 itselves that I know only shows curves for 250 v screen voltage.

Thanks in advance!

Wavebourn · 4th June 2012, 08:14 PM

If I remember right LS-50 datasheet contains curves with different G2 voltages, so it can be extrapolated approximately.

It has G3 as well. Adding +10-30V on it works similarly, without fear of frying G2.

Kay Pirinha · 5th June 2012, 04:21 PM

Hi Wavebourn,

the one that I know sadly doesn't feature plate curves referencing to 300 v screen. But the plate curves herein at pages 2 (top) and p3 (bottom) respectively, surprisingly differ much!

I've also had a look at the EL153 curves, mainly the same tube, but lacking the supressor grid, but also there's none for 300 v screen.

Best regards!

Globulator · 5th June 2012, 07:03 PM

The main problem I have with the GU50 datasheets is the Russian language. I guess Anodespannun is Max Anode voltage, but the rest is a bit of a mystery TBH - so I tend to build, measure, tweak - a bit like fumbling in the dark!

Compared to that the small signal stuff is easy

Kay Pirinha · 5th June 2012, 07:49 PM

I guess Anodenspannung is German and means anode/plate voltage

!

Best regards!

jazbo8 · 6th June 2012, 02:06 AM

Quote:

Originally Posted by Kay Pirinha

Hi Wavebourn,

the one that I know sadly doesn't feature plate curves referencing to 300 v screen. But the plate curves herein at pages 2 (top) and p3 (bottom) respectively, surprisingly differ much!

I've also had a look at the EL153 curves, mainly the same tube, but lacking the supressor grid, but also there's none for 300 v screen.

Best regards!

I thought EL152 is the civilian version? See if this one make sense.

Jaz

Kay Pirinha · 7th June 2012, 11:42 AM

Thanks. I know this sheet. At page 9 we find suitable data for audio frequency amplification, but it doesn't show the requested plate curves @300v screen. Those at p.3 relate to 250 v screen.

Best regards!

Alphy · 9th June 2012, 09:39 AM

Check this thread:
Trying to make sense of the Sweet Peach

There's also some other threads on the GU50 with data, mostly supplied by Wavebourn, who's an expert.

costis_n · 9th June 2012, 06:59 PM

Quote:

Originally Posted by Kay Pirinha

Thanks. I know this sheet. At page 9 we find suitable data for audio frequency amplification, but it doesn't show the requested plate curves @300v screen. Those at p.3 relate to 250 v screen.

Best regards!

In all GU50 datasheets only 250V G2 operation is mentioned. So this means you have to extrapolate them (make them up

)

Bilingual datasheet here. Seems like they wanted to make monies off potential enemy, too

http://tubedata.milbert.com/sheets/018/g/GU50.pdf

Wavebourn · 9th June 2012, 07:17 PM

Quote:

Originally Posted by costis_n

Bilingual datasheet here. Seems like they wanted to make monies off potential enemy, too

http://tubedata.milbert.com/sheets/018/g/GU50.pdf

PDF format did not exist during Cold War.

4th June 2012, 05:36 PM	#1
Kay Pirinha diyAudio Member Join Date: Oct 2011 Location: Tauberbischofsheim, Germany	GU50 plate curves Hi, does anyone of you know a source of GU50 plate curves at a screen voltage of 300 volts? Any sheet of LS50, EL152 and GU50 itselves that I know only shows curves for 250 v screen voltage. Thanks in advance!

4th June 2012, 08:14 PM	#2
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	If I remember right LS-50 datasheet contains curves with different G2 voltages, so it can be extrapolated approximately. It has G3 as well. Adding +10-30V on it works similarly, without fear of frying G2. __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

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5th June 2012, 04:21 PM	#3
Kay Pirinha diyAudio Member Join Date: Oct 2011 Location: Tauberbischofsheim, Germany	Hi Wavebourn, the one that I know sadly doesn't feature plate curves referencing to 300 v screen. But the plate curves herein at pages 2 (top) and p3 (bottom) respectively, surprisingly differ much! I've also had a look at the EL153 curves, mainly the same tube, but lacking the supressor grid, but also there's none for 300 v screen. Best regards!

5th June 2012, 07:03 PM	#4
Globulator diyAudio Member Join Date: Aug 2004 Location: Cambridge, England.	The main problem I have with the GU50 datasheets is the Russian language. I guess Anodespannun is Max Anode voltage, but the rest is a bit of a mystery TBH - so I tend to build, measure, tweak - a bit like fumbling in the dark! Compared to that the small signal stuff is easy

5th June 2012, 07:49 PM	#5
Kay Pirinha diyAudio Member Join Date: Oct 2011 Location: Tauberbischofsheim, Germany	I guess Anodenspannung is German and means anode/plate voltage ! Best regards!

7th June 2012, 11:42 AM	#7
Kay Pirinha diyAudio Member Join Date: Oct 2011 Location: Tauberbischofsheim, Germany	Thanks. I know this sheet. At page 9 we find suitable data for audio frequency amplification, but it doesn't show the requested plate curves @300v screen. Those at p.3 relate to 250 v screen. Best regards!

9th June 2012, 09:39 AM	#8
Alphy diyAudio Member Join Date: Mar 2012	Check this thread: Trying to make sense of the Sweet Peach There's also some other threads on the GU50 with data, mostly supplied by Wavebourn, who's an expert.