Lou: I recall my experiances with 4-1000`s when I ran them in the
70`s&80`s...It was relatively easy to get at least twice the power output
per dissipation rating, and a single tube could be pushed to 2500 watts out,
at least on 20-80 meters where I operate..Now that`s power into a suitable
dummy load...The old glass bottles were TVI/RFI generators if run this way
on the air as I`m sure most should agree..1200-1500 watts output was very
clean if properly driven.
I believe you might see 1500 watts from a single 3-500Z before the tube
reached maximum emission if: Your power supply doesn`t flatten out. Of
course,this is way beyond what I deem reasonable,except for testing
purposes.
The 8877&other ceramic tube amps I have built I would never even think of
trying for 2 to 2.5 times output per plate dissipation rating...They cost
too much for such foolishness,except the YC-156 will easily exceed twice the
rated dissipation in power output. If your PSU is stiff enough,this tube is
an excellent performer and very clean at high power levels too..I believe
Bill Orr produced some great reading for hams as well as practical ideas for
amps,antennas,etc...We all sometimes make comments that are a result of
personal experiance,others opinions may differ..73,Jim..K7RDX..
----- Original Message -----
From: <Gudguyham@aol.com>
To: <km1h@jeremy.mv.com>; <amps@contesting.com>
Sent: Wednesday, July 23, 2008 8:46 PM
Subject: Re: [Amps] Bill Orr comment
> Peter DF3KV brought up a good point about Orr "meaning" that the tube
> should
> do 2 to 2.5 times the plate dissipation in it's actual usage at rated
> spec's. His example is proof to that fact. I took the statement to mean
> 2 times
> or more of the tube "rated" dissipation. The only reason I brought up
> the
> subject was that I have personally seen a 3-500zg tube do 1500 watts
> output with
> 100 watts of drive. Yes, the plate current was way high no doubt, the
> grid
> current was high too but the tube made the power without flattening out
> before it reached that point. It's about time we had some action on
> here. Now we
> can all go back into hiding again. Lou
>
>
>
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