the coil for the high bands is airwound with 5,8mm tubing, the low bands are 1,8mm wire wound on a ceramic form with openings for cooling air 73 Peter _______________________________________________
In einer eMail vom Do, 25. März 2004 18:21 MEZ schreibt frank_goenninger@t-online.de (Frank Goenninger): Hi Frank, Since this is a tetrode it will be run without grid current, the driver does no
In einer eMail vom Fr, 26. März 2004 17:06 MEZ schreibt "R. Measures" <r@somis.org>: you are probably right Rich, but full throttle in Germany means 750W output not 3500W ;-) 73 Peter __________
-150V is the maximum allowed, the tube will be cut off then Hi Frank, You will get the correct idling current with -80V on the grid. Check this webpage: http://i5uxj-2.cln.it/amp/amphf3/amp1.html I a
agreed, from more then 10W EIRP upwards you have to file drawings and declare how high signal strength is in the environment, proofed either by calculation or measurement the ham lobby obviously is j
around Hi Jerry, nothing wrong with that, plenty of amplifiers with those tubes have been built and used commercially in Europe Example RFT with the KN1E with 4 parallel tubes and one as driver. I b
and never yes, that´s another great site by Steve Bench, for tetrode screen regulators the shunt regulators are preferable as they sink negative screen current 73 Peter ________________________
big. simpler minimize does, I regulate Hi all, pretty good experience with screen powersupplies for large tetrodes with handles are built overhere with 3 single bridge rectified powersupplies fed by
have anywhere what are screen increasing my 3x 4CX350FJ amp was starting to draw grid current quite early and that ruined IMD of course and made me experimenting with voltages. Finally it run best wi
using the stock EBM G2S085-AA which is a single inlet centrifugal blower which I run at top speed since it is only a 31 cfm blower at 0". From what I've seen, it is the quietest of it's type, spec'ed
parallel, so I guess those people prefer to run a 3-phase power supply at 4% hum without capacitor, so will be very happy with 4µF 73 Peter _______________________________________________ Amps
voltage as Hi Harold, Most resistors are specified for only 500V, so unless you use special hv resistors you need at least 8, better 10 resistors serial connected to form the bleeder bank. 73 Peter _
some work Hi Chuck, the L4 was equipped with 3-400Z and the L4B with 3-500Z. If you still get full output there is no need to swap the tubes, anyway both types will do fine. Alternatively you could u
voltage True, but with zero bias and low ZSAC even at 2KV, IMD is better then most transceivers produce. My tubes are running with 4KV anyway, but I can switch to half voltage 73 Peter ______________
used believe what you is too. those modulation knowing more the amplifiers. this is a wrong way to go, this modem wants a lot of bandwith: "Be sure your audio filters are about 3KHz or wider." This w
US But how US at It depends on time and antenna used. On a major contest when I beam to the US and the band is open to most part of the world, it seems that the band is crowded with US operators, if
it lot voltage to this tube have this problem every list. another toast voltage think turning pretty Yes, it depends on the kind of tube. I run several different homebrew amps: Two with glass envelop
voltage with the With the voltage the equalisation. distinctly dodgy Hi Peter, If that theory is solid, all fullwave bridge rectifiers should have equalising resistors connected across the diodes, bu
manufacture effectively and Hi Peter, in the fullwave bridge at one 1/2 cycle, IMHO there always two diodes series connected through the load and the other two are "off" Over a full cycle they act as
If somebody is looking for large dummyloads, there are 25 and 50KW versions on sale in Germany: http://www.singer-elektronik.de/fix/she.html 73 Peter _______________________________________________ A