? I can measure the average level of distortion during voice modulation in under one minute when I get set up -- provided there is no interference on the adjacent channels. cheers, Lars - Rich..., 8
? a Zener diode is not adjustable. A string of forward biased diodes is. cheers, Mauri - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissi
-22db or so down is what the DAFs measured. Si, Correcto Hardly. AB1 has zero grid current. The DAF runs heavy grid current. ? Duhh ? True enough. The 813 was designed for Class C. ? The gain of an
? How about arrangin' for a second coming, Ian? cheers. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Admini
? better read the Eimac specs on drive level. 100w is way too much. The max. plate/anode current is rated at 400mA. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contest
Above 100 or so mA, there isn't much variation in fwd drop across a diode compared to cathode/grid driving voltage. Zeners exhibit some variation in reverse V-drop as current increases. // The big d
We are discussing grid driven amplifiers. Normal grid driven linear amplifiers draw virtually zero grid current. GAF amplifiers are grid driven and they draw grid current. When the AB1 amplifier is
? Heath invented the best, and quietest 3-500z cooling system ever. See a SB-220. // Observe the cooling fins on the Eimac heat radiator cap. Are they designed for lateral cooling or vertical coolin
With AB1, no grid current is permitted. With DAF grid current is permitted. When positive grid voltage is permitted, peak anode currents increase substantially. ? Not by DAF rules. By AB1 rules, yes
For linear operation, gain must remain constant. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrativ
agreed The zener string must have been defective. As Norm's amplifier demonstrated, going from -30db to -22db would necessitate a totally unregulated 0v-350v screen potential plus plenty of grid cur
For 3-500Zs, the total cathode - grid potential would vary not a lot. The driving potential is close to 115v. What difference would it make if the bias potential shifts from 4.2v at zero drive to 4.
Heath fan-motor bearings are oilite type. If you don't oil the oilite bearings every few years, the fan will eventually slow down and stop. ....... - Rich..., 805.386.3734, www.vcnet.com/measures. -
Ordinary power transistors have no toxic substances lurking about inside. If you want to meet Jesus sooner rather than later, try drilling through RF power transistors. cheers - Rich..., 805.386.373
"I am not a crook". -- Richard Millhouse Nixon. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative
? "shit happens" -- Forrest Gump. ? As I see it, this means something different. To wit: when the screen voltage is adjusted too high for the available drive available in AB1, ZSAC increases unneces
? It would have been my guess that DAF would be on a submission and domination trip. mercy! ? The only was I know to deal with S&D freaks is to be very certain of your stuff beforehand, do not parta
? I have none. My guess is that one would have to grind the layer just under the drain of an RF power unit. As to the danger of BeO dust. A friend of mine saw a lab demo involving rats. In a couple