Quote:
Originally Posted by Dr Wobble
One person said this is rubbish as this POV is given by folk who've never designed an amplifier. The general consensus is NEVER to exceed the maximum ratings given on a data sheet.
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Some folk get really rather didactic about what they "read on a data sheet"- sometimes this suggests that they don't really have a full grasp of a particular situation or have adequate flexibility of mind. Or maybe they just like giving instructions to people. A classic example is audiophile forum discussions on PSU use where someone will cut in with a slightly robotic "Maximum reservoir capacitance for XYZ valve is 12uF" regarding a successful commercial design that uses several times this value- not taking into account transformer secondary voltage, winding resistance, reflected impedance, steady-state current, whether using a cheap commercial electrolytic or high-quality, low ESR block.... The published curves need interpretation, understanding and application, not the quoting from a worst-case header.
All the same, it is worth playing safe and keeping to ratings- I used to do occasional overflow work for a valve specialist and got a bit weary of amps using Chinese valves (however flowery the salesmanship) that were being run at 650V+ when they really ought to have been restricted to the 500V of the original topology. All in the interest of skirting round the elephant in the room that xx solid-state watts are cheaper to achieve than xx thermionic watts and straining every sinew to try and even up the gap.
Keep up the good work, Andy, it's been an absorbing exercise here and I admire your persistence,
Colin