Re: Cooper Smith Amplifier
Hi Gonzini, it could be the Copre-Smith Prodigy from OCT/NOV 58 RC. This used 2, ECL82's in UL push-pull with an ECC83 as amp/phase splitter and an EZ81 as rect.
The circuit only shows a single sec winding on the trans, but there are connection details of a small 5 pin plug that can be linked for 3/8/16 ohms.
Main smoothers were rated at 350v, so HT would not be much above 250V.
ED
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