[Amps] 3-500z

[Mike Schatzberg]

Hello Jason:

>From the Ameritron Catalog:

      Model # Description Price
      AL-80B 1 KW Output Linear Amplifier w/ 3-500ZG Tube on 100/110/120V 
for US


My old SB 220, which I have to admit I have heavily modified, and uses 
Chinese Graphite Donut Triodes, does about 1100 PEP, sending a string of 
dits at about 35 wpm, with only one tube installed.  The Amp really loafs 
along at 1.5 KW with about 80 watts of drive.  I don't have enough power 
supply to get more than about 1,700 to 1,800 PEP into a dummy load with both 
triodes.  I doubt that the components would like it very much anyway.

By the way, thank you Mr. Measures for your sequenced vacuum relay switching 
circuit, which I used in that amp.  I must have used it over 12 times so 
far, last time using the Chinese vacuum relays from Gigavac, in an amp with 
a trio of 3cpx800A7s.  I use two vacuum relays rather than your reed relay, 
with some modification of your circuit.  The Chinese relays handle the full 
output and are fully the equivalent of the Kilovac HC-1.  Gigavac has 
special pricing for radio amateurs.  Your EBC circuit works great too.

The specs may perhaps be wrong for the AL 80B, I never have worked on one 
here.  But I don't believe that it is the only commercial amp with specs 
like this with the Eimac/Chinese Triode.  I think the old Heathkit single 
tuber was specified the same way.

73 and Happy Dxing,

Mike
WB2AJI






----- Original Message ----- 
From: "Jason Buchanan" <jsb at digistar.com>
To: "Mike Schatzberg" <cherokeehillfarm at earthlink.net>; "sb200" 
<sb200 at optonline.net>; <amps at contesting.com>
Sent: Wednesday, October 26, 2005 5:21 AM
Subject: Re: [Amps] 3-500z


>> if your Eimac tube outputs 1 KW or so, that should mean your good to go.
>
> Ye cats - 1KW from a single 3-500Z?