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@frontier.com>
To: <tentec@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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