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Author Topic: Making of a triode valve (vacuum tube). Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 01-06-2008 03:09 PM                     Just found a link to this video on alt.engineering.electrical. It shows the making of a triode valve by hand, and may be of interest to some of you here. web page  |  IP: Logged Gerard S. Cohen Jedi Master Film Handler Posts: 975 From: Forest Hills, NY, USA Registered: Sep 2001 posted 01-06-2008 04:25 PM                     Thanks for that entertaining and instructive video. There's no limit, it seems, to what a true craftsman can do! My father had told me that radio vacuum tubes used to be sent back to the factory for remanufacturing when they failed from use, and this was confirmed when I found printed enclosures that were once packed with new tubes (RCA, I think.) I couldn't understand how this could be possible until I saw this video. I have great respect for those with the multiple skills (and equipment) needed for such tasks. In contrast, I tried to make a folded paper (origami) crane offerering. I couldn't find anyone who could show me how, so I went to google.com and then ask.com and printed four different instruction charts, one requiring 25 folds, but neither my wife, our receptionist nor I could succeed in making one. Happily my daughter visited and made one for me, which I will offer at the next opportunity.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-06-2008 04:30 PM                     That is one of the most amazing things I've ever seen.  |  IP: Logged Robert W. Jones Film Handler Posts: 74 From: San Antonio, TX Registered: Mar 2007 posted 01-06-2008 04:33 PM                     Great video. And they still rock for audio applications! Rob  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 01-06-2008 04:35 PM                     Quite interesting. I bet he can make his own xenon bulb... - Monte  |  IP: Logged Jim Cassedy Phenomenal Film Handler Posts: 1661 From: San Francisco, CA Registered: Dec 2006 posted 01-06-2008 04:48 PM                     Somewhere around here I have some old radio magazines from the 1920's and I recall seeing advertisements in the back for places that would "re-build" vacuum tubes. I had an uncle who collected antique Christmas tree lights that were in different figurene shapes. Santas, Snowmen, Trees, etc. I remember when I was a kid he used to take them to some old guy in Brooklyn NY when they burned out who would re-build the lights and somehow put new filaments inside to make them work again. (This was almost 40 years ago) Similar but not as exacting work as rebuilding a vacuum tube.  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 01-06-2008 06:08 PM                       Excellent! Thanks, Stephen! Btw, who was it I heard of, not too many years ago, who got all the old RCA 6L6 manufacturing equipment?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-06-2008 06:15 PM                     Western Electric is still producing brand new tubes of many of their older designs... They saw an eventual need to be able to supply vaccum toobes down the road and they kept the entire factory in mothballs for well over two decades. Undersea transmission lines from what I understand are still all vaccum toobe amplified. They have also bought the right to produce the venerable Gold Lion KT-88 power Pentode... they are a mere $350.00 a pop! http://www.westernelectric.com/# One thing is for sure... they have definately got some of the coolest logos in existance! Mark  |  IP: Logged Matthew Bailey Master Film Handler Posts: 461 From: Port Arthur,TX Registered: Sep 2000 posted 01-06-2008 07:28 PM                     Found on You Tube a 1950's Telefunken tube ad. click here  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 01-06-2008 08:10 PM                     That's a neat Telefunken ad .. and noticing the opera singer singing into a "Neumann bottle" mic (which prob had the Telefunken trademark on it..). -Monte  |  IP: Logged Aaron Sisemore Flaming Ribs beat Reeses Peanut Butter Cups any day! Posts: 3061 From: Rockwall TX USA Registered: Sep 1999 posted 01-06-2008 10:43 PM                     quote: Mark Gulbrandsen They [Westrex] have also bought the right to produce the venerable Gold Lion KT-88 power Pentode Apparently, this is not the case anymore (that site was last updated in 2005). Apparently New Sensor (the Sovtek/EH people) has those rights now, along with the design and trademark rights for Tung-Sol and Mullard. You can buy the Russian-made Gold Lion KT88 right now. (and for less than Westrex was charging for them) ... ...and the KT88 is a beam tetrode, not a power pentode. -Aaron  |  IP: Logged Robert W. Jones Film Handler Posts: 74 From: San Antonio, TX Registered: Mar 2007 posted 01-06-2008 10:52 PM                     The 6L6's are indeed still in demand. My Son's band uses them in their amplifiers. Can't beat older technology in some cases.  |  IP: Logged Jeff Stricker Master Film Handler Posts: 481 From: Calumet, Mi USA Registered: Nov 1999 posted 01-07-2008 06:27 AM                     Lots of the more popular tube types are being manufactured in China under various old-time brand names. Beware of poor quality. I had a "Penta" China manufactured 3-500Z that failed at around 500 hours of filament time. In my very conservatively operated RF linear amp, the tube runs at less than 5% duty cycle (5% key down time). Welds holding plate structure in place failed on one side allowing plate to tilt and touch the grid POOF! A USA Eimac tube will run thousands and thousands of hours in this application.  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 01-07-2008 08:12 AM                     I've just had another look at the video, and there's something a bit odd about the triode he's making; it doesn't seem to have a getter.  |  IP: Logged Jack Ondracek Film God Posts: 2348 From: Port Orchard, WA, USA Registered: Oct 2002 posted 01-07-2008 10:56 AM                        quote: My father had told me that radio vacuum tubes used to be sent back to the factory for remanufacturing when they failed from use, High power broadcast transmitting tubes still are. There are two or three companies in the US that do this. The cost is about half what a new tube would run, and carries the same warranty as new. I keep a couple of old AM transmitter going this way. The final tubes in one of them are no longer made, but you can rebuild 'em pretty much forever.  |  IP: Logged

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