This is a good way to run a lot of dissipation with low voltage swing in
the tube. I have seen this done at one of the National Labs for large RF
triodes, for same effect. The anode of the tube in the procedure (seen
in AL80?) is sheet metal with the vertical folds. These respond well as
the anode is adsorbing free ions. With this procedure, be careful not to
exceed the dissipation max of the plate of the tube, measured by Ep x
Ip. I would recommend not going above 2/3 of this, unless you know/trust
the cooling design of the amplifier well and that the blower and air
ducting provides the correct mass flow (and back pressure) for full
dissipation.
73
John
K5PRO
On 11/26/16 4:15 PM, amps-request@contesting.com wrote:
Message: 3
Date: Sat, 26 Nov 2016 14:20:50 -0600
From: Mike Waters <mikewate@gmail.com>
Cc: "amps@contesting.com" <amps@contesting.com>
Subject: Re: [Amps] SB-220 update and gettering
Message-ID:
<CA+FxYXgwYfOUXQLpT1OZp_TdF7aTL0K0GkQ8UeweDLdnHpNEnA@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Here is an excellent method of gettering tubes, including the 3-500Z.
www.w8ji.com/gettering_tubes_al572b_al80b.htm
There are many other related and useful pages there.
73, Mike
www.w0btu.com
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