Improving the performance of eB104 with a transmission line transformer

[K9AQ]

I have had an EB104 amplifier on the air for about a year. I was very pleased with the peformance up through 20 meters, put the power dropped off on the higher bands. I was encouraged by Baruch, 4Z4RB, to try replacing the T3 output transfomer with a transmission line transformer (TLT). Based on Baruch's encouragment and guidance, and lot of research, I modified my EB104 amplifier to use a TLT. The result have exceeded my expectations. I am getting a near perfect match from 80-10 meters, with an honest 600 watts output, dropping to about 557 watts on 10 meters.

I would encourage anyone who is experimenting with an EB104 amplifier to give this a try. It is easy to make and you won't be dissappointed.

I have written an article that discusses the TLT and implementing it in EB104. If you would like a copy, drop me an email, dsolberg@wi.rr.com and I will send it to you. One condition, please give me some feedback. This is a draft of the article, which I hope to submit to QST, so I really need some editing assistance.

Don Solberg
K9AQ

[KA9MFY]

I would very much like to read your article using the TLT instead of the T3 output transformer.
73s,
Wes Wilson
KA9MFY

[K9FV]

Just in case Don doesn't see this thread anytime soon, why don't you send him an email - his email is good on this site.

Don has written up an excellent paper on reworking the EB104 amp and makes it a LOTS better.

73 de Ken H>

[ZS1ADC]

Don thank you very much for the info

Reg