[Amps] What limits DC plate supply voltage for GI7B?

[Jeff Blaine]

Hipot is good for a relative indication but not an absolute one. As the 
tube gets hot the BDV can change and the tube can glitch.

Also the GI7BT is easier to cool than the GI7B due to the different 
cooler structure & mount.

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com


On 10/25/19 12:41 PM, Jim Thomson wrote:
> Date: Fri, 25 Oct 2019 14:09:48 +0100
> From: Alan Ibbetson <alan at g3xaq.net>
> To: amps at contesting.com
> Subject: [Amps] What limits DC plate supply voltage for GI7B?
>
> <Has anyone tried 3KV or more with a GI7B?
>
> <73, Alan G3XAQ
>
> ##  Perhaps....if  possible....  hi-pot  test  each  tube  in  question.
> Temp  bond the  grid to  the  cathode....  then  hi-pot  between
> anode to  grid.
>
> ##  problem  is,   your  next  batch  down  the  road might  hi-pot  test
> lower.    Install a fast  HV  fuse in  series  with a 50  ohm  glitch  resistor.
>
> Jim   VE7RF
>
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