[Amps] 1625

[Rex Lint]

Whew!

The max rating for a 6AG7 is 300 V, so you ran them at 3.3 the max voltage!
It must be one tough tube.  The plate dissapation is 9 watts, so 4*9 = 36
watts, and if you pegged the 200 ma meter, the input was >200 watts, so you
were probably dissapating >66 watts - about twice their rating.  I'll bet
they WERE red!  

Water cooled?

I ran a heathkit AT-1 that used one for an oscillator, then used a 6L6 for
the amp.  All told, about 30 watts!  If I'd only known....

But that was in the '50's



      -Rex-
 
     	K1HI
       Rex Lint
       Merrimack, NH 

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Colin Lamb
Sent: Thursday, February 12, 2009 5:12 PM
To: Carl; gzook at yahoo.com; amps at contesting.com
Subject: Re: [Amps] 1625

I built an amp using 4 x 6AG7 tubes.  Ran 1000 volts on the plates and my
200 ma plate meter pinned when I talked, so I did not know how much current
I was running.  I have no idea if the plates got red hot - because they were
metal tubes.  I used it for a few years on 75 meters until I moved on.  The
amp was still working with the original tubes when I removed it from
service, and I still have it.  Drove it with a 10A.  

Life was much simpler in those days.  I think I will fire it up one of these
days again.  

73,  Colin  K7FM
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