Hello to the list, I want to know if is it possible to obtain 350 watts output from 160 to 10 with a single 4CX250b tube, for linear amplifier service, and which working class? AB1, AB2?; 2000 Plate
The STC datasheet gives typical 2 tone operating figures of -30dBc 3rd order and -50dBc 5th order at 325W pep, 2kV anode supply and 100mA quiescent.. I reckon you do well to get that much output in p
You could almost make with an 4cx350, Give it some 2800V, and it'll still live for a long time, and a relatively clean 325-340W. a 4cx250? no way, it'll max out at 300W, if you want decent life, and
At 09:10 27/10/2003 +0100, OZ1PIF wrote: You could almost make with an 4cx350, Give it some 2800V, and it'll still live for a long time, and a relatively clean 325-340W. a 4cx250? no way, it'll max o
I guess that some unbypassed cathode resistance might also work to improve linearity. I have a vague memory of seeing an article about cathode driven '250s, but can't recall when/where. Steve _______
Thanks so much for the answers; I read the RCA manual specs about this tube, but wanted to know about other's experiences (I have at hand two of them, no sockets nor chimneys). Best regards Guillermo
One option would be to cathode drive it (if you have the drive power) with it operating in AB1 with usual bias. This would provide feed-thru power and improve linearity due to inherent negative feedb
Page 65 of Eimac's "Care and feeding of power grid tubes" shows a selection guide for SSB service for which the 4CX250B is listed as being capable of 348W "useful power output" in AB1 with a 3rd orde
On Wednesday, October 29, 2003, at 01:00 PM, Mike Tubby wrote: -- Original Message -- From: "GGLL" <nagato@arnet.com.ar> To: "Amplificadores Lineales" <amps@contesting.com> Sent: Sunday, October 26,
Mike Tubby wrote: Page 65 of Eimac's "Care and feeding of power grid tubes" shows a selection guide for SSB service for which the 4CX250B is listed as being capable of 348W "useful power output" in A
Ian, I guess you know this already, so it's for information. "only -19dB and quite irresponsible by implying that level of IMD is fit to be put on the air". I may agree, but it depends. You can not o
Helge wrote: Ian, I guess you know this already, so it's for information. "only -19dB and quite irresponsible by implying that level of IMD is fit to be put on the air". I may agree, but it depends.
I noticed a cathode driven amplifier in one of my old Radio Handbooks. It used a pair of 4CX250 tubes. I suspect cathode drive would provide less distortion. Also, oddly enough in a very old QST ther
I feel that we should remember that the 'grandfather' of this series was the 4X150, which was a 1945/6 design, intended for Class C service, and the 4X250 followed a few years later. (My 1946 ARRL ha