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The end of tubes?
The end of tubes?
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Old 20th August 2012, 11:49 PM   #21
FullRangeMan is offline FullRangeMan  Brazil
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There is one plastics bonding/melt machine which uses the 211 Shuguang tube.
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Old 21st August 2012, 12:39 AM   #22
suntechnik is offline suntechnik  Russian Federation
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So we gonna see how BestBuy promotes SS transistor based microvens soon? Sounds promising
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Old 21st August 2012, 02:36 PM   #23
v4lve lover is offline v4lve lover  Netherlands
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The end of tubes?
"to make sure your microwave needs more frequent replacement we have taken the opportunity to replace your magnetron whit an solid state device"

v4lve
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Old 24th May 2018, 12:38 AM   #24
gorgon53 is offline gorgon53  Finland
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for REAL power at high frequency there is no substitute for a vacuumtube.
High power needs high voltage AND high currents.
And what would be better than a tube wich combines the ideals of vacuum and a steam or fluid cooled solid copper anode?

A semi-conductor???

Tubes can handle Ua peak in the tens of kV with hundreds of amps peak at megacycles.
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Old 24th May 2018, 12:58 AM   #25
FullRangeMan is offline FullRangeMan  Brazil
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The main obstacle to survival of audio tubes is the high price and extremely low useful life of these products, I has informed a average sino 300B lasted only 700 hours driving a 805 (no soft start though).

There are reports WE-300B from 1940s came to last 10K to 40.000 hours and today tube manufacturers that offer 300B with 5 years warranty on the shelf are highly praised...
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Last edited by FullRangeMan; 24th May 2018 at 01:00 AM.
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Old 24th May 2018, 01:07 AM   #26
Soundhappy is offline Soundhappy  France
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Audio vacuum tubes contemporary production

VinylSavor: News from the ELROG Tube Factory 10
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Old 24th May 2018, 06:31 AM   #27
petertub is offline petertub  Sweden
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Regarding new production tube lifetime : i have at home a quad of JJ 6550 that has
3800h . They still hold bias as when new,
It's a very small sample but it shows what current factories may achieve.
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Old 24th May 2018, 04:07 PM   #28
stocktrader200 is offline stocktrader200  Canada
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can't explain how a $8 6922 tube can beat an OP275 but it crushes it in sound quality even with the op275's 0.0003% THD figure. 6922 is also rated to exceed 10,000 hours.
It is simply cheaper to use tubes properly. They are not disappearing anytime soon.
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Old 24th May 2018, 05:12 PM   #29
Miles Prower is offline Miles Prower  United States
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Quote:
Originally Posted by TheGimp View Post
The article was on our intranet, and I can't find it in a google search. I suspect the link I've attached is not reachable, but added it just in case it is.

It seems the last bastion of tubes is high power high frequency RF, and that niche may be closing to SS technology...
This is irrelevant to VTs for audio. I don't think this is going away any time soon. There are still lots of left over TV types from the good ol' days (lots of TVs made, and plenty enough of the VTs they used both for new production and as replacements) and new production for gee-tah amplification. You will probably see the depletion of TV types over the years, but I'm pretty much set so far as that goes. Still, types like the 6L6-oids will be around a lot longer, and can be used for sound reproduction amps with excellent sonic performance.

If there's a "crisis" it's in the solid state arena. Good sounding transistors are becoming as rare as WE 300B's and go for similar prices. VFETs: gone (talk about WE 300B level rarity and cost)! Lateral MOSFETs are a niche item produced by a few boutique manufacturers. These days, the big demand is for switching devices that typically make for poor audio amplification. That drove out the decent SS audio devices.
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Old 25th May 2018, 04:25 PM   #30
Sorento is offline Sorento  Europe
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Quote:
Originally Posted by gorgon53 View Post
for REAL power at high frequency there is no substitute for a vacuumtube.
High power needs high voltage AND high currents.
And what would be better than a tube wich combines the ideals of vacuum and a steam or fluid cooled solid copper anode?

A semi-conductor???

Tubes can handle Ua peak in the tens of kV with hundreds of amps peak at megacycles.
BLF888E Transistor LDMOS 750W UHF watercooled for DVB service
BLF888E | UHF power LDMOS transistor | AMPLEON
As with computers the magic word is Parallel
16 on a bord for 2.8kw
10 boards fit in a cabinet for 25kw
6 cabinets can be paralleled for 150kw
So far I know all DVB transmitters in Europe were solid state from the very beginning
Obviously it is economic and reliable despite the fact that a single tube could do the job ...
Example:
http://anywavecom.net/wp-content/upl...re-18.03-1.pdf

Last edited by Sorento; 25th May 2018 at 04:28 PM.
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