[Central-Electronics] 6AG7 selfdestruction

[Jim candela]

Steve,

    Can you describe the scenerio that took place leading to the demise of
that 6AG7?

Here are some pokes in the dark:

* The 10a ran the 6AG7 pretty hot, and that was back when line voltage was
between 110-115 vac. With today's line voltage often above 125 vac, the tube
cannot take it with elevated filament, screen, and plate voltage.

* The tube was gassy

* The bias was insufficient

* The Screen voltage was too high

* The tube was driven hard when the plate tank was out of resonance

So let's hear your story. You are correct that this reflector has been
silent too long.

WAKE UP FOLKS! Lets hear about your CE equipment.

Happy New Year,
Jim
WD5JKO



-----Original Message-----
From: central-electronics-bounces at mailman.qth.net
[mailto:central-electronics-bounces at mailman.qth.net]On Behalf Of Jim
Sent: Monday, January 02, 2006 7:10 PM
To: Steve Hobensack
Cc: central-electronics at mailman.qth.net
Subject: Re: [Central-Electronics] 6AG7 selfdestruction


Steve, I have no answer for you but I also would like to know the
answer to that question.

Thanks Jim

On 1/2/06, Steve Hobensack <stevehobensack at hotmail.com> wrote:
>     I hope some people monitor this reflector. I haven't seen any traffic
> here is quite some time. Well, it happened for the second time . The 6AG7
> tube in my CE 10B shorted and took out the 100 ohm 5 watt resistor plus
the
> rf choke. I got about a year or two of operation out of this 6AG7. It was
an
> RCA tube. Someone once told me that there was a particular brand of 6AG7
> that was good to use in the 10a/10b/20a rigs . Does anyone remember?
>
> 73 & Happy New Year,
>
> Steve...N8YE
>
>
> _______________________________________________
> Central-Electronics mailing list
> Central-Electronics at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/central-electronics
>


--
 73 De Jim N5TJZ

If you own Collins Amp 30L-1 SN 29068 Contact me
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