the screen Yes When the anode/plate V disappears, there is no current through the resistor that delivers current to the screen regulator, so the screen has 0V/0A. cheers, Gary - Rich..., 805.386.373
hv with I have never seen one open during a hv+ to gnd arc. The screen can be damaged only if its W-rating is exceed. No HV fuse is needed if the primary of the hv transformer has a circuit breaker.
To: <amps@contesting.com> ** increase drive to the point that grid current flows and the AB1 amp becomes an AB2 amp. ** with AC coupling, grid-current flows into the grid bias supply. well. ** so in
To: <amps@contesting.com> to drives that So an AB1 amp can be AB2 if it is overdriven, and an AB2 amp can be an AB1 amp if it underdriven? How would you design an AB1 amp that can not be overdriven?
** Revitilizing thoriated tungsten cathodes seems to work with tubes whose emission was reduced by air contaminating the thorium. In the case of a slightly gassy tube, the contamination can be drive
** 6, 4-1000As in parallel would make a Nice contesting amp. An SB-200 or FL-2100 would drive them quite nicely. cheers, Mark - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measu
The transformer would still blow a fuse if it was shorted. To save fuses, put a 300w lamp in series with the primary. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end
Apparently not. Rich does not use the Microsoft's Windows OS. cheerz, Conrad - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end
** 75 - 90 mA. ** true // What is the fil V at pins 1 and 5 on the socket? The 1kd5 I worked on had 5.9V. ** the I-plate/anode meter could be in error. I would compare it with a DMM. A adjustable bi
When one side of the heater is grounded, and an inadvertent hv+ arc to gnd temporarily raises the cathode to several kv negative, such will cause a heater/cathode arc that can burn open the heater a
thanks. A DC brushless fan operated from a rectifier/dc-filter connected to the 11Vrms fil winding would give more cooling for berserko contesting. cheerz
Roughly 22k-hours if one keeps the filament potential to the bare minimum and dutifully protects the envelope from meteor showers. - Rich..., 805.386.3734, www.vcnet.com/measures.
The lightest weight power supply would likely be a voltage-multiplier type operating direct from the electric mains. With a x6 V multiplier and 230V mains, c. 1600vdc could be produced for c, 1kg in