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121. [AMPS] blocking cap current (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Wed, 21 Jul 1999 08:47:39 -0700
? "absolute power corrupts absolutely". .- Lord Acton. ? And with the amplifier tuned for max with half drive and 750w out, the grid current would be roughly the same, the anode swing would still be
/archives//html/Amps/1999-07/msg00393.html (13,128 bytes)

122. [AMPS] blocking cap current (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Wed, 21 Jul 1999 10:03:34 -0700
? ... the roughly half-cycle when anode current is not cut off. ? Strictly DC, no, however anode conduction takes place on one polarity rather than two. dominant factor. ? At 29.7 MHz, this seems qu
/archives//html/Amps/1999-07/msg00395.html (9,031 bytes)

123. [AMPS] SB1000 PROBLEMS-HELP! (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Wed, 21 Jul 1999 19:00:00 -0700
To find out what's what you need a high pot. Anode to grid leakage at 8kV should be under 10uA. If you see a blue glow, a bad metal/glass seal is indicated. // Grid to fil. leakage should be under 3
/archives//html/Amps/1999-07/msg00400.html (8,552 bytes)

124. [AMPS] blocking cap current (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Wed, 21 Jul 1999 23:28:08 -0700
? agreed, Tom. Can you explain how the half cycle pulses of anode-current, supplied through the HV-RFC from the HV supply, are able to pass through the DC blocking capacitor? ? This is not the answe
/archives//html/Amps/1999-07/msg00402.html (9,148 bytes)

125. [AMPS] 4CX1500A in grid driven AB1 for Ham radio (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Thu, 22 Jul 1999 10:33:14 -0700
? Only for Class C (where anode dissipation would be minimal) . For Class AB1, using AØ emission, the rating is 4kV. ? According to the Eimac data sheet, using 750v on the screen, 4.0a-peak.
/archives//html/Amps/1999-07/msg00410.html (9,921 bytes)

126. [AMPS] 572-B Input impedance?? (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Fri, 23 Jul 1999 09:55:01 -0700
... put a thin coat of urethane varnish on wire to hold in place, when dry, remove enough turns to move resonance above 60MHz. // At VHF, I would not try to use VHF suppressors. . - later, Phil Rich
/archives//html/Amps/1999-07/msg00424.html (8,377 bytes)

127. [AMPS] 572-B Input impedance?? (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Fri, 23 Jul 1999 15:48:09 -0700
Beats me. I know of no way to neutralize a grounded-grid amplifier. Wow. I would be interested to know the grid resonance and the anode resonance. Does it take off with the suppressors removed? late
/archives//html/Amps/1999-07/msg00429.html (9,030 bytes)

128. [AMPS] Fusing PS (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Fri, 23 Jul 1999 15:48:11 -0700
additional sounds good With a C-filter, slow blow is the only game in town. However, if there is a slow blow circuit-breaker in the branch, you don't need no stinkin' fuses. - cheers, Vic Rich... R.
/archives//html/Amps/1999-07/msg00430.html (7,583 bytes)

129. [AMPS] 572-B Input impedance?? (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Fri, 23 Jul 1999 19:27:20 -0700
? I recommend reading what Eimac's ''Care and Feeding of Power Grid Tubes'' says about neutralization of grounded-grid amplifiers. At what frequency, Tom? ... makes some sense. Rich... R. L. Measure
/archives//html/Amps/1999-07/msg00433.html (9,496 bytes)

130. [AMPS] revisited duty cycle... (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Sat, 24 Jul 1999 03:09:11 -0700
? I know a proud owner of a SB-200 who has a speech processor that allows him to talk-up the plate current slightly higher than the plate current he is able to obtain during key-down tune-up. Is it
/archives//html/Amps/1999-07/msg00437.html (7,689 bytes)

131. [AMPS] 4CX1500A (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Sat, 24 Jul 1999 04:50:11 -0700
? I did not intend to intimate that the 4CX1500A was designed for Class C. The dissipative ability of the 4CX1500A is relatively small compared to its emissive ability. Class C simply puts less burd
/archives//html/Amps/1999-07/msg00439.html (7,467 bytes)

132. [AMPS] revisited duty cycle... (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Sat, 24 Jul 1999 04:58:03 -0700
? Hearing was believing, John To: <amps@contesting.com> Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@cont
/archives//html/Amps/1999-07/msg00440.html (9,470 bytes)

133. [AMPS] Blower Noise Problem (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Sat, 24 Jul 1999 18:49:39 -0700
Capacitor-start motors are typically used in compressors where the motor must start against a heavy load. Blower service is quite the opposite. If you measure c. 130 -160 vac across the capacitor wh
/archives//html/Amps/1999-07/msg00449.html (7,386 bytes)

134. [AMPS] equalizing resistors/caps on small HV power supply?? (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Mon, 26 Jul 1999 00:47:33 -0700
The new Handbook explains why equalizing components can cause premature failure with modern rectifiers. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.c
/archives//html/Amps/1999-07/msg00461.html (9,256 bytes)

135. [AMPS] Re: (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Mon, 26 Jul 1999 00:47:35 -0700
My guess is they are talking about input watts. Electrically, the 6JE6 is way different. peak cathode emission has a lot to do with pep output. You need a calibrated scope and hv multiplier probe to
/archives//html/Amps/1999-07/msg00462.html (9,778 bytes)

136. [AMPS] SB 220 PS Diodes (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Mon, 26 Jul 1999 00:47:39 -0700
600piv, 1A Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQU
/archives//html/Amps/1999-07/msg00463.html (7,360 bytes)

137. [AMPS] Re: (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Mon, 26 Jul 1999 13:36:52 -0700
? I actually used to work in a calibration lab (U.S.N., Pacific Missile Range). To calibrate RF wattmeters, we used a 50-ohm termination, an RF source, and an oscilloscope that was actually calibrat
/archives//html/Amps/1999-07/msg00481.html (8,723 bytes)

138. [AMPS] 572-B Input impedance?? (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Mon, 26 Jul 1999 13:36:56 -0700
? The critical question is: What is the measured grid-resonance when the grid is solidly held to the chassis?. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http:
/archives//html/Amps/1999-07/msg00482.html (9,125 bytes)

139. [AMPS] Re: Sweep tube amp (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Mon, 26 Jul 1999 13:37:01 -0700
? It helps to know that two, MFJ "3kW" tuners caught fire in the ARRL Lab with somewhat less that legal power. - cheers, Peter Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- F
/archives//html/Amps/1999-07/msg00483.html (7,426 bytes)

140. [AMPS] Grid Trip Circuit (score: 1)
Author: measures@vc.net (Rich Measures)
Date: Mon, 26 Jul 1999 13:37:03 -0700
? The Titan 425 that I repaired had unfatal gold-sputtering in both tubes. If the amplifier were in my garage, I would test the tubes for gold-sputtering with a high. pot tester. If leakage current
/archives//html/Amps/1999-07/msg00484.html (7,564 bytes)

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