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Thinking about doing a T match circuit for input of a 4 tube 572B box. but never did one. Can anyone pont me in the right direction? Thanks in advance.

T-match circuits are typically used for antenna systems that have a wide range of reactances/impedances. Why do you want to use it on the input of an amp? I use a common pi-network matcher on my untuned amp. Works great.

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Ed - VA3ES

AMI #529
QCWA #28666
10-X #11131

yeah i can use a couple of trimmer caps. just i seen a few using the 2 inductors and1 tuning capacitor and wanted to try it. trying to save a few dollars in parts.

You might be able to get it low enough with just a trimmer cap.

http://www.ameritron.com/pdffiles/AL-811H.pdf

Page 10 will give the cap and inductance specifications, should work the same as the 572B for the tuned input.

Checked link, thanks. Should work great.

Good deal let us know how it turns out.

I thought that T-network were primarily High Pass Filter; shows you what I know....

Electrically, in your application, the "T-Match" is a paralled tuned circuit that will be fed with a Capacitor that is tapped somewhere down the coil.

Stick with the tried and trusted Pi-network.

.

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