[Amps] HV transformer issue

[David H Craig]

    Thanks Dick, I can try that.  As constructed the bolts are running thru 
the same piece of angle aluminum that mounts the transformer to the chassis. 
As for cap bank I am using six 2watt 220k metal film Rs across each cap for 
equalizing, no bleeder at all.  Not worried about a fast bleed-off of the 
caps.  I just tried the 100k across the cap bank briefly to see if there was 
a short in the secondary that might only show up under a little load & to 
see how much voltage drop it would give.

    73 Dave


----- Original Message ----- 
From: "Dick Hanson" <dick at dkhanson.com>
To: "'David H Craig'" <n3db at radix.net>
Sent: Saturday, May 03, 2008 8:38 PM
Subject: RE: [Amps] HV transformer issue


> Hi Dave....
> I think Gerald is onto something here.
> When I bought a large (3KVA) toroid hv trans from Hammond some years back,
> they were very careful to point out that the bolt to hold the core to the
> chassis needed to be insulated from the chassis. I can't give you all the
> tech logic behind this, but the insulated bolt never got hot.
>
> BTW, do you have voltage equalizing resistors across those caps, or, are 
> you
> just using the single 100K bleeder?
> 73
> Dick, K5AND
>
> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of David H Craig
> Sent: Saturday, May 03, 2008 7:31 PM
> To: TexasRF at aol.com; amps at contesting.com; km1h at jeremy.mv.com
> Subject: Re: [Amps] HV transformer issue
>
> I assumed not since it was built as it is, but that said a dead SB220 HV
> transformer I pulled apart did indeed have insulated bolts.  Should I try
> doing so, maybe with a teflon tube as opposed to paper?
>
>    73 Dave
>
>
> ----- Original Message ----- 
> From: <TexasRF at aol.com>
> To: <n3db at radix.net>; <amps at contesting.com>; <km1h at jeremy.mv.com>
> Sent: Saturday, May 03, 2008 8:24 PM
> Subject: Re: [Amps] HV transformer issue
>
>
>>
>> Are these through bolts supposed to be insulated?
>>
>> 73/gw
>
>