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Got your attention! I just finished my TU882 and am duly impressed.
Two things I have noticed: Quite strong microphonics when the case is rapped. This headphone amp is capable of driving headphones to ear damaging levels.
Neurotic question: What happens when a tube dies while you are wearing headphones? Will it rupture your eardrums? Or will it gracefully sign off?
Another neurotic question: Is leaving the headphone amp on for a length of time without headphones a bad idea? Tube power amps should not be turned on with out load. How about wee tube headphone amps?
Follow Ups:
•GE 5670W is a small signal tube. The best part of this tube is also the
disadvantage of this tube.
•GE JAN 5670W - it's a terrific tube for very little moneyGE 5670w tube: Decent performance overall. Decent extension in both treble and bass, with a fairly smooth mid. Good resolution, detail and a decent soundstage.
However, if there is a vibration in the surrounding, 5670W will easily pickup and amplify it.
If using 5670W type of tube, you tap the case as the tube is very sensitive and picks up the sound of your vibration from your tap.
Edits: 02/22/10
Hi Victor,
Yes, it is a good tube and a wonderful amp. My question is more hypothetical.
My guess is that small tubes generally do not abruptly die in a horrific manner. They get weaker and weaker until they are unusable long before they blow. And, low power tubes probably do not blow out hard.
Any yehs or nehs on this?
Yes, I am totaly agreeed with you.
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