[Amps] Anode clearance and Chassis WANTED

[mike.tubby at thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC)]

----- Original Message -----
From: "Jim Isbell" <millenniumfalcon@cableone.net>
To: "Mail list Amplifiers" <amps@contesting.com>
Sent: Saturday, June 14, 2003 5:59 PM
Subject: [Amps] Anode clearance and Chassis WANTED


> I am building a 4-1000A linear and will have 4KV on the anode.  What is
> the MINIMUM clearance I must have from the anode to the top of the metal
> cabinet?  It looks like it will be about 1" in my present configuration.
>  Will that be sufficient to prevent any problems?
>

Depends what 'problems' you are thinking of...

* an air gap of 25mm has more than enought dialelectric strength to deal
with
  4Kv DC + many Kv of RF

* you might have an issue with stray C on higher bands, like 28MHz,
depending
  on how much circuitary is close to the lid

* you might have problems with restricted air-flow


> I am looking for a chassis 14"x13.25"x3.25".........may have to go to a
> shorter one if the answer to above question is NO but really need the
> 3.25" for the input tuning box to fit.
>

Mike G8TIC