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

Barry
20-05-2009, 17:21
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

Mike
20-05-2009, 22:50
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-nUK41tc&feature=related

http://www.youtube.com/watch?v=B5NJQXy-qFU

The Grand Wazoo
20-05-2009, 23:10
That's a bit of a beast!

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

http://www.youtube.com/watch?v=Zi4kXgDBFhw&feature=related
http://www.youtube.com/watch?v=lSAExHBrfwU
http://www.youtube.com/watch?v=SlNGKly09CQ&feature=related
http://www.youtube.com/watch?v=Opf5jIukSBM&feature=related

Barry
21-05-2009, 00:33
That's a bit of a beast!

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

http://www.youtube.com/watch?v=Zi4kXgDBFhw&feature=related
http://www.youtube.com/watch?v=lSAExHBrfwU
http://www.youtube.com/watch?v=SlNGKly09CQ&feature=related
http://www.youtube.com/watch?v=Opf5jIukSBM&feature=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

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

Barry
21-05-2009, 00:40
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

Marco
25-05-2009, 19:03
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.asp?TOPIC_ID=70704&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.

Barry
25-05-2009, 19:20
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.asp?TOPIC_ID=70704&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

Ali Tait
25-05-2009, 19:22
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/frank/sheets/090/4/450TH.pdf

Ali Tait
25-05-2009, 19:24
I'll tell Michael Eavis about them.You could run Glastonbury with a few of these! :)

Marco
25-05-2009, 19:39
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.

Barry
25-05-2009, 20:01
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

Ali Tait
25-05-2009, 20:04
Or your electricity bill!

Marco
25-05-2009, 20:19
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.

Will
25-05-2009, 20:27
Have a look at Josh's site, when DIY becomes full time.

Also look at his front horns and drivers..

http://electronluv.com/html/amplifiers/My%20Gallery/index.html

Marco
25-05-2009, 20:38
Nice link, Will!

Now these are just 'ice cool':

http://electronluv.com/html/amplifiers/My%20Gallery/index.html

:smoking:

Marco.

Barry
25-05-2009, 21:55
They look like something out of a Jules Verne novel or maybe Flash Gordon.

Barry

The Grand Wazoo
25-05-2009, 21:59
Did you guys see this thread - ???????????
Check out all of the links!!

http://theartofsound.net/forum/showthread.php?t=2833

Marco
25-05-2009, 22:40
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.