[Amps] 811H pops fuses

Alek Petkovic vk6apk at bigpond.com
Mon Jan 20 17:49:05 EST 2014

Here in VK6, the power company usually exceeds the nominal 240V AC mains 
voltage so, even when the Ameritron is set on its highest voltage tap, 
the HV is higher than specified in the manual and higher than the 
working voltage of the caps. I am lucky to have a very large auto 
transformer with a number of taps, which allow me to run my amp/s at 
230V AC. This gets the filament voltage down a little closer to spec as 

73, Alek.

On 21/01/2014 1:39 AM, Carl wrote:
> Ameritron has the lowest prices last time I bought. If you have the 
> wrong transformer taps selected it is easy to exceed the cap ratings.
> The manual is very clear about not exceeding 1700V.
> If they are set for 1700V or less at standby Id suggest asking them 
> for a free replacement. Ive had several fail right out of the box on a 
> bench PS test and they claimed CD sent them bad caps.
> Carl
> KM1H
> ----- Original Message ----- From: "Tom Osborne" <w7why at frontier.com>
> To: "Amps" <amps at contesting.com>
> Sent: Sunday, January 19, 2014 10:46 PM
> Subject: Re: [Amps] 811H pops fuses
>> Well - found the problem.  Got 2 shorted filter caps.
>> Is there a place to purchase these besides Ameritron, or would it be 
>> best to go with theirs.
>> These are CD270mf x 450 volts with the screw connectors.
>> I'd assume it would be best to replace all 4 instead of just the bad 
>> ones. 73
>> Tom W7WHY
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