grid current in 6AS7

OTL Asylum

OTL, Output Transformerless Amplifier User Group.

81.31.233.130

Anyone know the max gridcurrent I can allow on 6AS7s? I get about 600mA out of each triode section in my OTL with 120volt supply. The driver I have now cannot source any current and I want to try to use a beefier driver that will drive the grids positive. But without shortening the tube's life.
If anyone does not know, I will probably set up a test rig with one tube running hard with grid current to find out how much is too much. But the question is then, how do I figure out what they can handle? For instance if I run the tube with some 50mA grid current and it lasts for one week, how can I estimate what the max current is if I want the normal life of several years? I assume accelerated fatigue tests like this is a standard way to find a lifespan under certain conditons. But that means I need a factor to find out how much I must back off from the test grid current. Am I making any sense? Any ideas?

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The Cable Cooker

Topic - grid current in 6AS7 - Jalla 05:36:23 05/08/06 (7)

Re: grid current in 6AS7 - Lew 07:01:16 05/08/06 (6)

u're right! - Jalla 13:07:26 05/08/06 (5)

Re: u're right! - Ralph 14:16:55 05/08/06 (4)

Re: u're right! - Jalla 00:34:45 05/09/06 (3)

Re: 16 watts is about right - Ralph 12:32:32 05/09/06 (2)

Re: 16 watts is about right - Jalla 00:16:49 05/10/06 (1)

Re: 16 watts is about right - Ralph 07:57:37 05/10/06 (0)

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