As long as the E/I ratio is constant, it will work as intended. For example, at half the voltage, use half the current. At double the voltage, double the current. The Q should be 10 - 15. cheers, Ly
* There is no attack and release in a shunt regulator. It's on 100% of the time. The difference between gas tube regulation and zener-avalanche diode regulation is that at turn-on, gas regulators re
To me Alex, he sounds like a tube-type 33rpm audiophile who believes tubes and vinyl sound way better every time. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end
* True, but the grid also receives radiant heat from the 55w cathode. setting * Anyone who has done an autopsy on an 8877 knows that the anode and the grid collet cone are separated by c. 8mm at the
I looked and I found a few glitches. I made some minor improvements & or notes in the lines that begin with //. -- // Cathode-driven triodes (or tetrodes) have less gain than grid-driven tetrodes. /
* Alex: His claim of 1200w-pep from a pair of 4cx250Bs is quite Simply above the tube mfg's ratings. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end
This would be an opportunity to modernize the Mark I with high-speed switching. Total cost is c. $59. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end
To: <amps@contesting.com> ** Translation: Any loudmouth who takes issue with any of My statements is absolutely wrong, every time. and that's the botom-line. A 2w control grid in cathode driven serv
* I have seen gas regulators which glowed but did not regulate. * the blue glow was usually florescence on the glass - which means it was caused by electrons colliding with the fluxing agent in the
* Pse strike the "not". * The way Hamdom measures distortion, that's 6db better, or 30db down. I have built 4cx250 amps that produced under 32db down total distortion. The hat-trick is to run minima
To: <amps@contesting.com> * Super-Excellent idea, Steve. A showy visual display just might win over the "real radios glow in the dark" gang. Hmmmmm, lets see, with high-intensity LEDs, it should be
* no problema, Marv -- just add a LM-723/power-FET regulator after the LED regulator and we've got good V reg. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end
* Diodes and capacitors typically short when they fail. The open 25-ohm resistor suggests a +hv arc to gnd. Where is the resistor located -- in the pos. or neg. hv? I would disconnect the ps from th
* In my experiences, this is not rocket-science. The idea that only recognized amplifier experts can understand the esoteric secrets of proper layout smells kinda like bologna. - After I added 160m
In my experiences, c. 6% clearance around resonance parking places will avoid choke fires. Remove turns as needed. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end
An equiv oil filled C weighs more but lasts longer. 25uF would be plenty for a FWB/8877 supply. Modern electrolytics need way less, if any, reforming. they typically last much longer than electrolyt