[HomeBrew] 833 grouned grid?

[Jim Higgins]

At 19:09 01/22/02, Eric Hughes wrote:

>Has anyone on the list built or used the 833 tube in
>a grounded grid amp? I cant find any information on
>the data sheets or circuits in old issies of CQ, QST and
>73. I need some advise from someone who has experience using this type of
>triode in GG service. I have
>plenty of tubes and a 30 amp filiament transformer. My idea was to use two
>tubes in grounded grid to simplify the construction.  But, I am worried that
>the tube will not be happy without the -70 volts bias specified in the data
>sheets? I dont want to destroy the tubes on first power
>up. Will GG operation be possible with the 833?

Offhand I'd say it isn't possible to achieve anything useful by operating 
the 833 in a GG configuration.  The mu for this tube is about 35 and that 
will result in way too low a gain for useful operation in grounded grid mode.


73 de Jim, KB3PU