Graham Posted April 13, 2012 Share Posted April 13, 2012 Something I've been wondering about for a while, you see pedals like the EBS Valve Drive and T-Rex Squeezer which only run off 12V power supplies, now I now that the '12' in, for instance, 12AX7 refers to it needing 12 volts, but is a 12V supply really enough to power the pedal? I've been told before that tubes need mains power to be properly energized (right word?) so pedals running off adaptors just have a tube in to look pretty, but it's not actually functioning as a valve should. Any truth to this? I did do a search before posting but couldn't see anything, here's hoping someone with more electronics knowledge than me can help. Quote Link to comment Share on other sites More sharing options...
Bigwan Posted April 13, 2012 Share Posted April 13, 2012 No it's not marketing (BTW the 12 refers to the series heater voltage, not plate voltage). Some of these pedals use 12v AC adapters for a reason - they have internal transformers to step this 12v up to over 200v so the valves are running at a more normal plate voltage. Having said that others do run their valves 'starved', but there's nothing wrong with that, just sounds a little different! Quote Link to comment Share on other sites More sharing options...
Graham Posted April 13, 2012 Author Share Posted April 13, 2012 Cheers, that's quite helpful Quote Link to comment Share on other sites More sharing options...
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