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DIY HiFi Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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DIY HiFi Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: RE: Lux91 monoblock running very hot posted by Henryhleung on July 19, 2013 at 07:03:42:
> is it possible to lower the operating point of the Lux91 tubes?
> Ie reduce the voltage from 400v to 350v?
Not really.
> I'm curious whether this would not stress out the tubes
> as much and increase the life of the 300Bs.
Run at 300V/60mA the 300B should do 40,000 Hours, the way it runs in the Lux 91, around 10,000 hours. At 350V/80mA,the increase in live might be to 15,000 Hours, tops.
> The reason for asking is because people are often surprised
> or disbelieving when I tell them my mono blocks are rated 16w.
The standard operation of the 300B at 400V/80mA will give around 12 Watt.
http://www.westernelectric.com/products/300b_graphs.html
The rest is due to the driver circuit, being able to produce a greater input voltage to the 300B than the datasheet uses... Think of it as either turbo or afterburner.
> Some reckon its impossible for a single 300b implementation,
> others say my tubes will burn out very soon.
It is both possible, nor will the Amp "eat tubes".
If you look at the above link, you will find that WE lists operation with even nearly 18 Watt output power (more than the Lux 91 manages).
Of course, the tube experiences more stress and will live less long, but it is not a huge difference.
Thor
At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?
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Follow Ups
- RE: Lux91 monoblock running very hot - Thorsten 11:59:05 07/21/13 (1)
- RE: Lux91 monoblock running very hot - henryhleung 08:46:40 07/24/13 (0)
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