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Old 13th July 2004, 10:26 AM   #1
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Default spotted this on ebay - 700w triodes anyone?

Noticed a couple of these monsters for sale on ebay complete with original packing crates! Ultimate SE amp or the perfect lamp for that tube themed interior maybe?
I guess someone should rescue them..

http://cgi.ebay.co.uk/ws/eBayISAPI.d...MEWA%3AIT&rd=1

http://www.tubecollector.org/mt9l.htm
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Old 13th July 2004, 10:41 AM   #2
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Becase they were used in modulator stages they were definitely audio tubes ! But I don't know how it looks regarding linearity etc.

Regards

Charles
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Old 13th July 2004, 11:21 AM   #3
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I can imagine it would be great fun trying to build something!!!

I have some 8008 mercury rectifiers and a couple of microwave oven transformers if anyone is mad enough.

But what about an output transformer and driver stage.........?
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Old 13th July 2004, 01:15 PM   #4
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Quote:
Originally posted by martinab2
But what about an output transformer and driver stage.........?
Got any more MOT's?

Tim
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Old 13th July 2004, 02:00 PM   #5
dhaen is offline dhaen  Europe
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He's got 2 more biggies:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...D%0A5709548565
and:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...D%0A5709549874
I almost feel like bidding for one myself... For decoration of course...
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Old 13th July 2004, 02:04 PM   #6
karma is offline karma  Canada
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buy 2 make lamp's for the end table's
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Old 13th July 2004, 02:39 PM   #7
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Anyone got plate curves?

Got a plentiful supply of MOTs thanks to my local repair shop - It seems that when microwave ovens die the transformer is usually ok. Evil and dangerous things though!
Secondaries are grounded to the frame and can't usually be disconnected. I once used one as a heater transformer by removing the secondary and adding heater windings - only needs a few turns each.

Saw a page on an amateur radio site about bolting two of the things together to make a full wave rectified 2kv supply.

I would imagine that an output transformer might be more of a problem, mind you, a hammond 1642SE can handle 300ma and 75 watts
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Old 14th July 2004, 06:35 PM   #8
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This one seems to read "B.B.C. The White House Motspur Park New Malden, Surrey.."

It looks to be ither an unknown un-disclosed experimental anti-aircraft radar tube in when they were doing research between 1943-1949 OR it is a commercial broadcast tube from that era..Wouldn't be surprised if it is for the B.B.C or created by the B.B.C for the war effort.

There were certianly a lot of Air defence radar systems around at that time but I'll be damed if I can find any reference to one being at New Malden, Surrey..
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Old 14th July 2004, 11:00 PM   #9
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Only reference to the MT14 tube I can find is here http://www.bvws.org.uk/bulletins/bv24_1.htm No info other than a picture but I guess the British Vintage Wireless guys might know more
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