** If the HV DC-blocker shorts, the typical load-C will arc to ground and blow the primary HV fuses. // On a windy day, I have measured up to 3kV of static charge on an 80m anrenna, so a bleeder res
3, 100k, 3W for 300k-ohms total. They will handle 500v each, which is 1500v which =s 22 out @ 50-ohms. - Rich..., 805.386.3734, www.vcnet.com/measures.
Tektronix was doing this over a decade ago. A thermistor controlled the base current flow through a pass transistor whose emitter drove a DC brushless fan. The hotter the thermistor got, the faster
The relay contacts are easily readjusted and burnished. I recommend ordinary news-paper for burnishing. To do this, cut a strip of paper about a half-inch wide amd pull it betweern the closed contact
The only diffference is the resistance of the heater, The W is the same. Military aircraft and motor vehicles often use 24 - 28V electric systems. 4, 4cx350_s can make 1500W in AB1. The input circuit
3A diodes are good for 200A-peak, and there are few transformers whose secondary is capable of anything close. A glitch R in the HV+ is a good idea no matter what filter is used. The main drawback t
Watts are normally rms. In grid apps, one must use peak watts, not rms. Thus, at 50-ohms, 100V-peak = 100w-rms = +/- 100v-peak To: <amps@contesting.com> - Rich..., 805.386.3734, www.vcnet.com/measure
The only way to find out about seal integrity is with a high-pot tester. I have seen several-yr old, still in the mfg's carton, Jennings vac-variables that tested at less than half the marked V-ratin
** Every Resistor has intrinsic inductance, Typically, this is roughly 12nH per inch of length. Grid terminating resistance is usually chosen so they are compatible with 50-ohm drivers/transceivers
correct yes have fun, At least 800 screen V are needed. The simplist and safest screen supply is a zener-string shunt regulator at the lv end of the hv bleeder. 40, 5W, 20v zeners mounted on perfboa
** AB2 grid-driven has c. 20db gain - but the configuration has no inherient RF negative feedback to counteract the distortion products brought about by operating the grid in the grid-current region
To: <amps@contesting.com> ** AB2 doesn't permit anything. AB2 neans the operator Chose to drive the tube into its less-linear grid-current region. Up until that point, the tube is operating partly i