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Old 17th January 2004, 12:16 PM   #1
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Default Opinion upon amp life expectancy at 5 hours/day? (theres a catch)

What should I expect out of brand new components apart from the PIO caps in terms of life expentancy of the entire set as compared to a transistorised amplifier?

I've had about four transistor based sets in my day, straight off the mill stuff like Yamaha, Sanyo, Sharp, Teac and others...

three of them developed serious problems within 5 years, 1 of them (the teac) has a minor front-panel problem, while tho makes the set useless is of course binded by the (the most simplest components are usually the ones which have the most control but of least consideration in reliability)..

Cheers :P

I expect no bashing of anyone! Ya Heer!?

No repeats of page 4-5: The attraction of vacuum tubes / valves.
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Old 17th January 2004, 12:20 PM   #2
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/me hides underneath overturned t-shirt
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Old 17th January 2004, 12:36 PM   #3
Magura is offline Magura  Denmark
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depending of work conditions you can expect up to 50.000 hrs of reliable operation from a tube.

It is naturally not possible to get the max lifespan under the conditions they see in a living room. The on /- off and temperature changes plays a big role. So does vibrations.


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Old 17th January 2004, 12:46 PM   #4
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mmm, altho even with 10 hours a day that is 3650 hours a year

So you would see about 15 years with a pair of b/new tubes at 10 hours a day, okay that is satisfactory even plus or minus 5 years.

I was considering /other than/ valve components
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Old 17th January 2004, 02:01 PM   #5
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Magura
depending of work conditions you can expect up to 50.000 hrs of reliable operation from a tube.
Magura
50 Khours is a preamp tube run nowhere near any of its ratings.

Output tube life is extremely critical of how much juice you are
trying to extract from then, life low/medium single figure Khours,
but can be more if power output is not fully untilised.
I beleive the Quad 22 was deliberately underpowered
to achieve in the region of 6 Khours output tube life.

sreten.
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Old 17th January 2004, 02:29 PM   #6
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Well I have four 6SN7 input tubes and they're all running at about 100-200volt half is NOS (in box Tung-Sol rounded-plate

half is used out of other systems...

So goodness knows what life I could get out of those two...

I'm really looking for a few Tung-Sol's

Cheers people!
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Old 17th January 2004, 02:53 PM   #7
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Well made tubes, even Beam Power, Power Tetrodes and Power Pentodes will provide many years of service if the tubes are operated within their published specifications.

I just replaced the 7591A output tubes in my HH Scott model 299C integrated amplifier after nearly forty years of service.
During the first thirty years, the amplifier was used to power a pair of lobby monitor speakers in a radio station. The amplifier operated 24/7.
During the last ten years, the amplifier sat on a shelf.

When I received the amplifier, I tested it. The 299C produced thirty watts of power per channel before clipping.
This the exact number that HH Scott published forty years ago.
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Old 17th January 2004, 03:22 PM   #8
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WOW!

I suppose blackouts dont count :P
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Old 17th January 2004, 03:24 PM   #9
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But, that's like 262,800 hours!
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Old 17th January 2004, 03:26 PM   #10
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Nor lightning hits to the old babe.

I've still got the original tubes.
I don't know why ... they won't get any better with more age.
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