Re: ECC83 and Germanium diode to replace 7C6
That's a neat adaptor! I remember there used to be commercially-available adaptors like that - one version was supplied with the 8 Octal pins wired to short flying-leads with ready-tinned ends, so you could wire them to the tags on the B7G/B9A socket in the right order for whatever valve-substitution you were undertaking.
As to the valves used in US radios, yes the 'all american five' was cunningly aranged so as not to need a mains-dropper when supplied from US 110/120V supplies. There were some really-odd valve-voltages availabe over there though: I remember a 19AQ5, being the 19V version of the 6AQ5 and used in a RCA communications-receiver.
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