smoke Colin -- your e-mailer, Microsoft Outlook Express 5.00.2615.200 is not doing attribution marks correctly. cheers - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.
I have always agreed that the DAF config. works. input signal alone is not going to cause emission saturation. Saturation also requires screen amplification, which means a moderate amount of screen
Rich: I dislike "attribution marks" and stripped them out. I used quotation marks instead. My Microsoft Outlook Express 5.00.2615.200 is doing exactly what I told it to do. There you go jumping to fa
I said "Colin -- your e-mailer, Microsoft Outlook Express 5.00.2615.200 is not doing attribution marks correctly. " This conclusion is hardly faulty. The reason that Outlook Express was not doing at
During operation and measurements on the QBL tube, we have the following grid currents: Ig2 = 0 - 80mA Ig1 = 0 - 100mA Wich of course follows drive. Quite far from "zero grid-current" ! 73 de Lars /
--Original Message-- From: measures <2@vc.net> To: Colin Lamb <k7fm@teleport.com>; Peter Chadwick <Peter_Chadwick@mitel.com>; amps <amps@contesting.com> To: <amps@contesting.com> Date: 21 March 2000
To: <amps@contesting.com> The screen normally has a few nF of bypass C built into the socket. If it did not, the grid would not be shielded from the large signal at the anode - and regeneration woul
When it was suggested that we have a look at the 4CX5000A/8170 constant current curves, I had them on the Web within ten minutes. When are one of you DAF enthusiasts going to post the QBL's curves?.
Let's assume that the screen bypass is 5000pF, and the source resistance of the rectifiers is 1000ohms. This gives a time constant of 5 microseconds. So now assume that the phase delay on a 3kHz comp
A complex problem . Also, at say 14MHz, the grid is changing considerably faster than every 5uS. . 'tis a sticky wicket, Peter - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: htt
5uS. I don't follow what that has to do with it. The screen volts follow the envelope of the signal, not the individual RF cycles. Same way as the Collins high efficiency solid state PA in the late 6
"When are one of you DAF enthusiasts going to post the QBL's curves?. My guess is that the QBL curves are quite similar to the 8170 curves. In other words, the QBL's positive grid potential region is
Never. The only tests that are valid are on the air and unannounced. I have zero friends who have worse than -30db of splatter. Warren delivered. - Rich..., 805.386.3734, www.vcnet.com/measures. end
With screen potential wandering about, some input cycles produce little anode current and some input cycles produce much anode current. In 2.5uS, a 14MHz sinewave goes through how many polarity reve
Yes - the small input cycles produce little anode current, and the big input cycles produce lots of anode current. Coincidentally, the small input cycles poroduce less average screen volts and the bi
Big input cycles that arrive before the screen capacitor builds up a charge do not produce lots of anode current. If this is true, the amplifier will have less gain with small input cycles and it wi
Now there we do have agreement. Highly desirable whether you're talking of an AB1, AB2, B or g-g ( where the screen is RF grounded, rather than dc grounded). Regulate bias as well to keep the quiesce
Yet, in the DAF config., screen potential somehow does not count?. In AB!, tetrodes with handles normally have the screen DC grounded direct to the chassis in eight places. // To obtain stability in
Yeah, really. MOST of the clowns that hang out on 80 meters all splatter. Rich's friend probably had his compressor cranked all the way up to the max. All Rich says is he heard splatter. Well if spla