Screen driven output stage

nhuwar · 30th November 2008, 10:23 PM

Hi all,

Just wandering if anyone out there has tried to run a 813 in screen drive mode? I'm talking se by the way. I was thinking about trying it and was curious if anyone had any advice.

Thanks,
Nick

SY · 1st December 2008, 05:06 PM

Just from a quick look at the datasheet, the 813 doesn't seem like a good candidate- the screen drive requirements are much too high. Ideally, you'd want a tube where something less than 200V will get the tube conducting hard (thus the suitability of high perveance sweep tubes). The 813 looks like if would want at least 400V which is a pretty challenging drive level.

In theory, you could use a stepup transformer to hit the required swing, but at those drive levels, it would be an expensive and tricky proposition.

nhuwar · 1st December 2008, 05:10 PM

Thanks SY

Don't know to much about screen driving so figured I'd ask. You answered some other question I had too, thanks.

30th November 2008, 10:23 PM	#1
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	Screen driven output stage Hi all, Just wandering if anyone out there has tried to run a 813 in screen drive mode? I'm talking se by the way. I was thinking about trying it and was curious if anyone had any advice. Thanks, Nick

1st December 2008, 05:06 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Just from a quick look at the datasheet, the 813 doesn't seem like a good candidate- the screen drive requirements are much too high. Ideally, you'd want a tube where something less than 200V will get the tube conducting hard (thus the suitability of high perveance sweep tubes). The 813 looks like if would want at least 400V which is a pretty challenging drive level. In theory, you could use a stepup transformer to hit the required swing, but at those drive levels, it would be an expensive and tricky proposition. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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1st December 2008, 05:10 PM	#3
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	Thanks SY Don't know to much about screen driving so figured I'd ask. You answered some other question I had too, thanks.

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