Improving the performance of eB104 with a transmission line transformer
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, email@example.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.
I would very much like to read your article using the TLT instead of the T3 output transformer.
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>
Don thank you very much for the info