[Amps] Switching PS for filaments?

[Robert B. Bonner]

BTW celebrating 36 years "legally" on the radio this weekend.

I blew the control grids out of my homebrew 4  813 amplifier by cranking the
power up too high to squeeze the last couple watts out.  It still made power
but only about 1/4 as much.

I've only had a GRID TO CATHODE short on a 3-400 in my Drake L4 and I did it
at 15 years old by turning to transmit with the power turned all the way up.
A late at night accident, whoops $60 spent at Heathkit store to buy two new
3-500Z tubes

I've had a CATHODE weld failure on an 8877 and Eimac admitted to a run of
bad tubes and replaced it for free.  1979 code date.

I'd call that so far so good.

BOB DD

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Tom W8JI
Sent: Sunday, February 18, 2007 2:59 PM
To: TexasRF at aol.com; g3rzp at g3rzp.wanadoo.co.uk; amps at contesting.com
Subject: Re: [Amps] Switching PS for filaments?

> I'll get back to you in about 10 or 20 years and let you 
> know if there have
> been any more filament failures.

Fair enough, and by the same token I'll let you know when I 
have my first filament failure in a tube I'm using.   :-)

73 Tom




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