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Re: [Amps] Gonset 903a amplifier update

To: <n1miw@cox.net>, <Amps@contesting.com>
Subject: Re: [Amps] Gonset 903a amplifier update
From: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 5 May 2008 21:52:22 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Are there equalizing resistors across each cap?

Carl
KM1H


----- Original Message ----- 
From: "Larry" <n1miw@cox.net>
To: <Amps@contesting.com>
Sent: Monday, May 05, 2008 7:43 PM
Subject: [Amps] Gonset 903a amplifier update


>     Well everyone, I want to say thank you to all of the help I received
> here for getting this amp working again. I needed to replace several
> components in the P/S, as well as the tube socket. I would've never 
> guessed
> that would've caused my oscillation problems, but with the new socket, she
> seems to be quite stable! Of course, there is a "HOWEVER" that goes along
> with this email... I had a new cap fail in the HV power supply (internal
> arcing, followed by a funny smell). when I checked the caps, they were all
> VERY hot! The unit uses 5 100uF 450 volt caps. I was wondering what would
> cause this heating? This is the exact part the schematic uses, and my 
> plate
> current wouldn't exceed 250ma while testing. I believe this is almost at 
> the
> maximum current for the tube, but should they overheat enough to arc?
> Transmission times were kept to roughly 30 seconds at a time with roughly 
> 1
> minute in between, give or take. I was thinking about increasing the 
> value,
> but not sure what is safe to use. If I was to keep the same value, could I
> add 1 more cap to the P/S to "lighten the load" on the capacitor bank? I'm
> up for any suggestions anyone may have. Thanks again, and especially to 
> the
> one I thanked personally for their time.    ...Larry
>
>
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