Interesting (or just plain weird) Valves

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19-05-2009, 13:25
The Grand Wazoo

Interesting (or just plain weird) Valves

So, what valves have you got, or come across that are not like anything else you've ever seen?

1538-P1 strobotron.
A very small dome shaped 9-pin valve

Pics & info here: http://www.tubecollector.org/1538-p1.htm

A couple of years ago I sold 3 of these for a very pleasantly high price to a great gent in the States who had been trying for years to find some spares for his old machine.

They're a very high speed flash device (high speed in the sense that the flash period is very short) used in a 'Strobotac' which is a piece of gear for measuring very high speed motion - (no bowel or toilet jokes please)

http://www.tpub.com/neets/book16/67c.htm
20-05-2009, 17:21
Barry

Quote:

Originally Posted by The Grand Wazoo

So, what valves have you got, or come across that are not like anything else you've ever seen?

Pics & info here: http://www.tubecollector.org/1538-p1.htm

After 30 years involvement in electronics research, I have come across and used many unusual 'valves'. These were not the devices that people usually think of as valves, rather they were photomultiplier tubes, microwave magnetrons and klystrons and devices used to measure very low pressure levels (that is, a vacuum). None of these, apart from the photomultipliers, looked like the glass devices that are mystically worshipped by some members. :)

The web site you quote is very useful and interesting. I occasionaly use it inter alia for information on audio valves.

Regards
Barry
20-05-2009, 22:50
Mike

These are pretty cool :smoking:

http://www.tubecollector.org/150-6g.htm

http://www.youtube.com/watch?v=Rt-a8fxgtno

http://www.youtube.com/watch?v=KGb-n...eature=related

http://www.youtube.com/watch?v=B5NJQXy-qFU
20-05-2009, 23:10
The Grand Wazoo

That's a bit of a beast!

Did you ever dabble with this stuff................

http://www.youtube.com/watch?v=Zi4kX...eature=related
http://www.youtube.com/watch?v=lSAExHBrfwU
http://www.youtube.com/watch?v=SlNGK...eature=related
http://www.youtube.com/watch?v=Opf5j...eature=related
21-05-2009, 00:33
Barry

Quote:

Originally Posted by The Grand Wazoo

That's a bit of a beast!

Did you ever dabble with this stuff................

http://www.youtube.com/watch?v=Zi4kX...eature=related
http://www.youtube.com/watch?v=lSAExHBrfwU
http://www.youtube.com/watch?v=SlNGK...eature=related
http://www.youtube.com/watch?v=Opf5j...eature=related

Many years ago Fane made an ionic tweeter which had an incredible frequency response. Bowers and Wilkins used it in their P2 speaker. There was no arcing involved, so no light show! :(

For their next loudspeaker B&W replaced the Fane unit with an electrostatic tweeter: the DM70.

Barry
21-05-2009, 00:37
The Grand Wazoo

Yup, I smelled a pair of those Fanes once!!

.....and I've always thought the DM70's were just great. It's a shame they've been overshadowed by the Quads because they really were special in their own way.
21-05-2009, 00:40
Barry

Quote:

Originally Posted by The Grand Wazoo

Yup, I smelled a pair of those Fanes once!!

No doubt they would be banned today, what with health and safety and modern EU CE regulations.

Regards
Barry
25-05-2009, 19:03
Marco

Crazy valves

Calling Steve (SPS), Ali Tait, Steve the Shadow, etc, whaddya make of these babies (scroll down to the third picture):

http://www.hififorum.nu/forum/topic....04&whichpage=5

I presume they're triodes? Now I'd buy those puppies just to look at them! :eyebrows:

Does anyone know anything about them?

Marco.
25-05-2009, 19:20
Barry

Quote:

Originally Posted by Marco

Calling Steve (SPS), Ali Tait, Steve the Shadow, etc, whaddya make of these babies (scroll down to the third picture):

http://www.hififorum.nu/forum/topic....04&whichpage=5

I presume they're triodes? Now I'd buy those puppies just to look at them! :eyebrows:

Does anyone know anything about them?

Marco.

The amplifiers shown are single ended designs using Eimac 450TH directly heated transmitter triodes. They produce 160w.

Single ended 160w amps! - better tell Ali (Tait). Downside? - none, apart from costing $55,000 a pair!

Regards
Barry
25-05-2009, 19:22
Ali Tait

Fantastic aren't they? It's a DHT called the 450TH.Don't know much about them,but your probably looking at 100 or more watts single ended! :smoking:

EDIT-Found this- http://www.mif.pg.gda.pl/homepages/f...90/4/450TH.pdf
25-05-2009, 19:24
Ali Tait

I'll tell Michael Eavis about them.You could run Glastonbury with a few of these! :)
25-05-2009, 19:39
Marco

Now *that* is probably something which could lure me away from my Copper amp - if it has 'balls' as well as the stereotypical SET 'niceties' then I'm in there! We can worry about the price later :eyebrows:

Seriously, though, low-power is the thing that turns me off most about SET, as most amps I've heard sound 'lacklustre' in comparison to what I'm used to. I'm loving 30W Class A p/p into my 96db 15" Tannoy Reds... I'm not into the 'weedy' low power/high efficiency speaker route - I'm into high power/high efficiency!! :gig:

So I'd run those Eimacs with my Tannoys, no worries. Feel the force, baby, and get a tan at the same time! :lol:

Marco.
25-05-2009, 20:01
Barry

Quote:

Originally Posted by Marco

So I'd run those Eimacs with my Tannoys, no worries. Feel the force, baby, and get a tan at the same time! :lol:

Marco.

The heater dissipation alone is 90W/ triode, and of course for optimum performance you would be expected to have these amps constantly powered up. Clearly Marco, you aren't too concerned about global warming!:eyebrows:

Barry
25-05-2009, 20:04
Ali Tait

Or your electricity bill!
25-05-2009, 20:19
Marco

Quote:

The heater dissipation alone is 90W/ triode, and of course for optimum performance you would be expected to have these amps constantly powered up. Clearly Marco, you aren't too concerned about global warming!

Yes, but just think how much electricity I'll save by not having to use the toaster in the morning! ;)

Bloody awesome valves, though...

Marco.
25-05-2009, 20:27
Will

Have a look at Josh's site, when DIY becomes full time.

Also look at his front horns and drivers..

http://electronluv.com/html/amplifie...ery/index.html
25-05-2009, 20:38
Marco

Nice link, Will!

Now these are just 'ice cool':

http://electronluv.com/html/amplifie...ery/index.html

:smoking:

Marco.
25-05-2009, 21:55
Barry

They look like something out of a Jules Verne novel or maybe Flash Gordon.

Barry
25-05-2009, 21:59
The Grand Wazoo

Did you guys see this thread - ???????????
Check out all of the links!!

http://theartofsound.net/forum/showthread.php?t=2833
25-05-2009, 22:40
Marco

Yep I did, Chris, but forgot all about it! I'll merge this lot into your thread later :)

Too busy listening to music at the moment!

Marco.