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Old 22nd December 2012, 12:54 AM   #31
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Join Date: Jan 2006
Location: Victoria, Australia
Originally Posted by Bigun View Post
That's rather strange, I thought you said you hadn't built it yet ?
No it has never been properly assembled. It was a hand full of parts linked by alligator leads and tacked solder points. I had to do some sort of prototype to test the theory. I ran it on the CRO and was very impressed with square wave results etc. Far superior to the ZCA.

What I did find experimentally was the output cap didn't have to be any bigger than 3300uf (snubbed by 0.1uf) driving 8.2ohms and the input cap not larger than 0.1uf. In fact when I reduced the input cap the square wave at 10Khz looked a lot better. The amps good to 125Khz (-3db) and had a punchy driving sound. With a 24V PS the 2N3055 ran cold.

I think there is more in the tank if the PS is 48V and the Re (load) reduced to 8ohms. But I haven't proved this. I think then it will deliver about 2.5W. I have all the parts required to build the 48V version but I'm currently building tube preamps and power amps. I will get to it. So be the first.
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