Hey-Hey!!!,
You don't need any particular type of Iron. Stay class A, choke input PS, and no 'lytics. Of course good Iron helps a lot...

You are looking at the last amp I have assembeled/designed. Part of the Iron is salvaged from one sort of PS or another. Outputs are Heyboer's copies of the Peerless S265 with a few mods for this particular circuit. The finals are HY69's, a Thoriated Tungsten DHTetrode. The front end is an E-Linear cascode diff amp. Ec2 referenced to the cathode node instead of the usual ground through a voltage divider...

It makes about 15 watts.
regards,
Douglas

....damn Thrintun!