[TenTec] Failure Modes for 811a tubes? Centaur

[Kris Merschrod]

Ok, Steve has started a thread of interest to me.  I have a Centaur - 
relatively new set of 811As  - It blew fuses, I replaced the fuses and it 
ran for a few days.  Then it blew the fuses again.

Steve, did your Centaur blow the fuses?

I am getting up the gumption to try to guess which is the fuse that shorted 
(my hypothesis) and then pull it and put in another set of fuses.  There 
must be a better way.  Suggestions?

Kris KM2KM

----- Original Message ----- 
From: "Steve Berg" <wa9jml at frontier.com>
To: <tentec at contesting.com>
Sent: Thursday, October 17, 2013 7:47 PM
Subject: Re: [TenTec] Failure Modes for 811a tubes?


>
> I bought a nice Centaur amplifier from a list member a few years ago, and 
> finally got around to putting it on the air.  I took out the 572B tubes 
> that were installed in the amp, and put the original 811A tubes in there 
> so that I would be less likely to blow up by 600 watt autotuner. I have 
> since bought a new 238C tuner from Ten Tec.
>
> It was working fine, until the net last Sunday.  Suddenly, the output 
> power dropped.  I noticed later that the heater in the center tube was 
> out.  I cycled the power switch, and it came back on for a while, then 
> went dark again.  I have two sets of 572B tubes for the amp, but I am 
> curious about this being a common problem with 811A tubes.
>
> Any pointers?
>
> Steve WA9JML
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