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scott17 6th December 2012 01:30 AM

6BG6-GA
 
Any practical experience running the "standard" 6BG6-GA at 450V in triode or ultralinear for SE operation at 5K?

Looks to be about -22.5V cathode bias at 40mA.

Looks OK to me. Just looking for someone who has done this.

Thanks,

Scott

coresta 6th December 2012 08:41 AM

:eek: too high ! look at the 807 data sheet !;)

scott17 6th December 2012 09:01 AM

I did look at the Brimar 807 data sheet. It shows 600V max for the anode. The 6BG6-GA shows 700V max. The plate voltage in my scenario would be about 425V. Although the screen is shown as 350V max for the 6GB6, there is no definitive info regarding the max voltage with the screen tied to the plate or run as ultra-linear. The reason for my question.

Thanks.

coresta 6th December 2012 09:15 AM

Yes, i know ...the 807 was never intended to go ultralinear ... i' d avoid... go 450Va and regulated 300Vg2 ;)

scott17 6th December 2012 09:22 AM

Sounds good, I think I'll try it your way first.

So the 40mA and -22.5V looks OK with a 5K OT?

Thanks very much.

Scott

coresta 6th December 2012 09:30 AM

yep !:)

scott17 6th December 2012 09:33 AM

Thank you very much for your reply. I appreciate it.

scott17 8th December 2012 02:33 AM

I looked at my stash of 6BG6-GA. It appears as though the ones I have are the large plates. The only thing is they have the side getters. But other than that, they have the large gray plates as shown in the attachment.

Has anyone else come across this?

ImageShack® - Online Photo and Video Hosting

coresta 8th December 2012 07:55 AM

Yes, the grey one is "modern" , beefier, than the "old" black genuine ! ;) no problem, these will last a lot more than the chinese 6L6-KT66-6550-KT88 sold nowadays ....

Miles Prower 8th December 2012 09:18 PM

Quote:

Originally Posted by scott17 (Post 3272284)
Any practical experience running the "standard" 6BG6-GA at 450V in triode or ultralinear for SE operation at 5K?

Looks to be about -22.5V cathode bias at 40mA.

Looks OK to me. Just looking for someone who has done this.

This involves spec busting so far as the screen voltage rating. It's getting into iffy territory: maybe it works, since the screen and plate are always at the same voltage, and you have more leeway. Then, perhaps, it doesn't, or it could be very dependent on manufacturer types.

I've used these 6L6-oids, but only as pents, and also including parallel local NFB. Used that way, they sound just great.


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