Thanks all for advice. Yes would love to get a 500-series TEK! A 535 (?) in particular, just before the multi-tubed Y amp version.
Forgot to mention I have TEK TAS465; HP1640A and Hantek 200MHz digital available as test gear.
Didn't see a 'reply' icon previously, no idea why not.
Valves (tubes) keep you warm in the winter.
Regards
