diffrence between the 3-500Z and the 4-250A

[Al Parker]

hi Phil,
    I'd suggest that you download the spec sheets/charts on each, and you 
should see the major differences immediately, and the minor with some 
inspection.  1.  the 3-500 is a triode, the 4-250 is a pentode.  2.  the 
plate dissipation of the 3-500 is (nominally) 500 watts, and of the 4-250 
it's only 250 watts.  The 4-250 could be connected as a triode, there are 
many 4-400 amps running that way.  They're not directly interchangeable.  If 
you're planning on building anything I suggest that you do some reading.
73,
Al, W8UT
New Bern, NC
www.boatanchors.org
www.hammarlund.info

----- Original Message ----- 
From: "spalletta" <spalletta at RCN.COM>
To: <BOATANCHORS at LISTSERV.TEMPE.GOV>
Sent: Tuesday, January 15, 2008 2:54 PM
Subject: [BOATANCHORS-TEMPE] diffrence between the 3-500Z and the 4-250A


> what is the difference  between the 3-500Z and the 4-250A tubes and could 
> i exchange one for the other without to much fret? I use a Kenwood TL-922A 
> Linear Amplifier but am toying with building a wild one from scratch using 
> spare parts to see what im capable of (legally that is). Thanks Phil K1PAS
>
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