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Single Ended Triodes (SETs), the ultimate tube lovers dream.

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RE: Jeff, Thanks

Posted by drlowmu on April 12, 2010 at 22:08:12:
Yada,
Well, more good questions.
If an amp sounds better when the tube is run hotter, at or above the Manufacturer's spec, it is usually because that amp is poorly executed internally, as far as transfer function, and design of its power supply.
I find best results are obtained with over-designed power supplies, that have a natural stability, under all types of music playback. In addition to the supply's design being as near perfect as possible, the amplifier's internal transfer function becomes a matter to properly address, proper wiring of components, as to wire types, and lengths, and lay outs, so as to NOT LOSE complex musical information inside the ampfilier!!
Particularly in SE amps, where the power supply is INCLUDED in the audio circuit. !!
Most audio equipment is NOT made this way, it is made to a price point, or by individuals who deem such an approach as unnecessary. So, with poorly conceived and wired amps, the hotter the tube is run, sometimes - the better it may sound, at first. But alas, it is only temporary, as the tube quickly degrades due to the hot rodding.
Consider the "Golden Ratio" in design, things like you car, truck, lawnmower, and your Type 45 tube run BEST and longest when designed at or near that number.
And yes, when thoughtfully designed, the Type 45 at 7 watts dissiaption will sonically outperform the same tube running at its full rated 10 watt dissipation, in a good amp. Its easy to hear.
Your family car runs a lot better at 65 MPH than at 100 MPH, and I say it will probably run a LOT longer at 65 MPH. Others will no doubt disagree with me on this topic, and that is fine.
Jeff Medwin