Anyway military spec NOS sub-miniature dual triode of both Western and Eastern military are available on eBay and much cheaper than standard dual triodes, especially the Russian ones and it got me thinking about what Leo Fender might have done if he had access to these, which are I suppose the pinnacle of valve technology just as the technology became obsolete, at least for mainstream consumer electronics. So could I substitute sub-miniature valves into a Fender circuit? Well I tried it with a Bassman circuit and stand alone Reverb unit circuit pushed together like a kind of Tweed Vibro-King, shrunk to fit in a Tweed Champ sized cabinet. It's a bit noisy, but sweet sounding with the kind of Tweed thump and gritty complexity that you would expect.