[Amps] Re: Ameritron 811

[R.Measures]

On Jan 3, 2005, at 12:43 PM, Gary Smith wrote:

> RF parts... good stuff, knowledgeable people.
> 73
> Gary
> WA6FGI
>
>   ----- Original Message -----
>   From: Eric Dobrowansky
>   To: amps at contesting.com
>   Sent: Monday, January 03, 2005 11:21 AM
>   Subject: [Amps] Re: Ameritron 811
>
>
>   Most likely the tube in the socket with the blown resistor has 
> developed an
>   internal short.

I have never heard of an anode-grid short in an 811A.

> Call Ameritron and ask for replacement tubes if they are
>   under warranty.  I have repaired two 811s where one or two of the 
> 811 tubes
>   have internally shorted, causing the 51 ohm resistors to repeadly 
> fail until
>   the tubes were replaced. There is a high failure rate with the 811 
> tubes
>   MFJ/Ameritron is supplying with new amplifiers. They appear to be of 
> the
>   cheapest Chinese variety. One owner gave up after two replacement 
> sets from
>   MFJ, and went with a set from RF Parts, and has not had the cover 
> off of the
>   amp since!
>
>
>   Eric
>   KE2D
>
>
>
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>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org