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Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
I inherited a CX3000 tube amplifier and its guts. This would be a great tesla project. I don't know if it works but it would be a project indeed and I am looking for idias. I have the basic scematic for the single tube VTTC. talk to me N.B.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
That looks like a real nice amplifier, it has vacuum capacitors and everything. If it's designed for the ham bands, I would sell it to a ham for several hundred bucks and use some of the money to buy the parts for a VTTC.
If it's an industrial unit for plasma etching or suchlike, and can only handle one frequency (13.56 or 27Mhz I guess) then it would be harder to sell to a ham. I would still be inclined to keep it in one piece and use it to drive a high frequency Tesla resonator.
I guess you meant 4CX3000? or 3CX3000? The 4CX**** tubes are high gain tetrodes, not really best for a VTTC. Triodes like the 811 and 833 are easier to get working, and more forgiving of mistakes that would vaporise the grids of a 4CX-whatever.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
it is a 4cx3000 I believe and I have all tha guts in my storage and if memory serves me it was for 2Mhz but I will Have to check this. I will take more pictures lator. thanks for the replies and it would be a project
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
i have a 4cx1500b and the heater is rated for 6v at 9 to 11a It was from a plasma generator, I couldn't carry the tranny[>50lb] but I kept the tube and the HV diodes. are they really no good for VTTCs?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Tetrode tubes like the 4CX... series can be used, but it's more difficult. You need to provide a screen supply, and the control grid is much easier to burn out than in a triode. I would really recommend starting with a triode if you're a noob. (ie you don't know what a screen supply is, or how to calculate control grid dissipation.) Again, hams love these tetrode tubes for their linear amps, so find a ham and try and get him to swap it for an 833. :P
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Here is my contribution to the "bigger is better" thread. It is a 60 kW 30 Mhz transmitting triode that runs on 12 kV and has a filament current of 89 A at 6V.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
This isn't a "bigger is better" thread, it's a discussion on making VTTCs with 4CX**** tubes. My opinion is that the 3CX series would work well (being triodes) but the 4CX series would be more hassle than they're worth. TDU, wake me up when you get your 60 kilowatt VTTC working
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looking for ideas, CX3000 triode tesla
The 4CX**** tubes are high gain tetrodes, not really best for a VTTC. Triodes like the 811 and 833 are easier to get working, and more forgiving of mistakes that would vaporise the grids of a 4CX-whatever.
