FYI, if anyone is interested in trying the Cossor 807, the best prices I have found have been from Vintage Electronics
https://www.vintage-electronics.co.u...alve-tube-nos/
Not affiliated of course but the prices on ebay were making me scratch my head. Know they were available at a more reasonable price. Still pretty good deal IMO, especially considering what new tubes and popular NOS go for.
Edit: Forgot the price, 45 Pounds.