Dave,
Thanks for the reply. I do have an added question. Would I be seeing
parasitic conditions before and without any RF ye? This has happened only
when i switch the amp on (power switch) still in standby and no RF load
applied as yet just at start up on the power switch? thanks
> Date: 08/15/2005 9:01:37 AM
> Subject: RE: [Amps] 2nd grid resistor blow Ameritron AMP 811H
>
> You are getting a parasitic sometimes in that tube. Replace the tubes
> parasitic suppressor. Get a kit from R. Measures on this list.
> Dave aa9tt
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
> Behalf Of D Pipes
> Sent: Monday, August 15, 2005 9:47 AM
> To: Amps@contesting.com
> Subject: [Amps] 2nd grid resistor blow Ameritron AMP 811H
>
>
> late last year I purchased a Ameritron 811-H amp. First amp I have had in
> years. Back in January i posted on this list my problem that I had blown a
> grid resistor on the back right side tube. With the help of this list i
> learn much and replaced the resistor after i also found what I had assumed
> to be the total reason for the blown resistor. The tube in that socket
had a
> visible defect where the top spring like wires actually had blown loose
and
> cold be shook up and down with light shaking. Anyway replaced the tube
with
> a set of Taylor select (4 matched) from RF Parts. That was in January and
> all has been perfect.. not an arc not a pop and tuned fine. I kept the 3
> "good" tubes and tossed the obvious bad tube.
>
> Well now to the point of this email. Last week I came in to do a little
ham
> radio.. switched on the radio and then as always switched on the amp. POW!
> arc and glow. Same resistor same tube. I pulled cover replaced the
resistor
> and replaced the tube with one of the original "good" tubes I had. Amp is
> back to working perfect.
>
> Any ideas? The last fix lasted 7 months.. all perfect. Both times the
> problem occurred at switch on. opr mode in standby no RF load just when
the
> switch power was turned on. I did re-check the tube that appeared bad (no
> physical defects seen) and proved that the tube has an internal short.
(blew
> the replaced resistor) .. anyway re-replaced the resistor and put the
older
> "good" tube back in and all is just fine... right now...
>
> Question is.. does this sound like a tube problem an amp problem or
both??
>
> I do have a 3rd party soft start nit that my amp is plugged into and the
amp
> is wired for 240 v
>
> Any suggestions?
> Thanks for nay and all help...
>
>
> D Pipes
> dpipes@earthlink.net
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