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RE: triode connected pentode: zener diodes...

Posted by Jim Doyle (A) on November 10, 2011 at 21:52:47

In Reply to: triode connected pentode: zener diodes... posted by deathtube 667 on November 10, 2011 at 18:56:29:

I found the article and attached the link for others...

Yeah, for EL34s - I can see where tying the surpressor negative would
lower the partition noise. Interesting that the only place I've ever
seen that done is very high performance scientific gear using a pentode
input amp! :)

What is it that you think you hear with this change?

I can suggest some other beam tubes in that same TV Deflection class
that you are dealing with... The 6AU5 - plentiful - good too - it's used
as the driver for the 845 on DeHavillands $9000 beast that people like at the shows. The 6DQ5 - a BEAST - seriously big overbuilt tube, designed for abuse.

Last but not least, if you want to take the project you have and bump
it into glowing tungsten DHT territory - doing what I did with 811A's
is suprisingly cheap. You can get nice 811A for about $40 a pair! You'll
need two 6.3V 4A transformers and some sockets... I think an 811A
add-on might only be $60 in parts for both channels!

So long as you have a 5K OPT good for 80-100mA - you are totally good to go! That 6Y6 gets turned into a cathode follower and you hook it straight up to the 811A's power grid. Shazam. In business with DHT.

-- Jim

• http://www.t-linespeakers.org/tubes/triode-trick.html   (Open in New Window)

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