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EL95 tube pinout - g1 duplicated

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aros71

Member
Joined 2015
atrad-audio.co.nz
I came into possession of a quad of EL95 along with a pair of small 10k Ra-a UL OPTs for them. So I'm building a small PP amplifier around them, expecting 6-7 wpc in UL.

Cathode biased for simplicity.

Topology is a 6N1-based initial gainstage AC coupled to a 6N1 LTP

Anyway, so much for the project. I note the EL95 has both pins 1 and 7 noted as being g1 (control grid).

What's the convention here? I feel like there's something I should know. Is it normal to use just one of the pins and leave the other disconnected? Or is it normal to connect those pins when wiring up the base?

I feel like this is one of those things that might be there to stop RF oscillation or something, but searches haven't turned up anything more than opinions, mostly conflicting.

Thanks
 
Tubelab_com

Tubelab_com

Member
Joined 2005
tubelab.com
Use either pin, or both, whatever is convenient.

Some of these smaller tubes used the extra wire and pin to conduce some heat away from the grid rods to help control grid current.

The little 6AQ5 / EL95 stuffs a lot of heat into a pretty small package......don't run them into the red plate zone. The glass will melt, then the tube sucks air and dies.
 
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