There is no free lunch, either use triodes with low ZSAC and small gain or tetrodes with 20db+ gain and high demand of ZSAC. I have no problem to let my YL1056 idle with 1100W ZSAC and use the same t
Why should one care about an amplifier without EBS or high idle current at all? That current is only drawn if actually transmitting and not in standby mode without output power. 73 Peter, DJ7WW Not t
I donīt think that there is enough heat wasted between words that it worth to do something about it, in my opinion it is never a lot of additional wasted power between words on normal talk. On pauses
When operating DR1A I do as well, but release it on pauses. 73 Peter Many use a foot switch Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://list
The use of 162ĩF @3.6KV as well 73 Peter, DJ7WW _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
In Germany the limit is 750W measured at the tx output. 73 Peter, DJ7WW But remember for most of Europe, full legal limit QRO is rather less then 1500W, (400W limit here in the UK, measured at the fe
Here we can use the three phases for any purpose we intend to. Maximum power is 55KVA with my installation. In my HV power supply the 2ĩF capacitor is plenty, without it ripple voltage is 4%. 73 Pete
I certainly did. I looked up what the commercials did. No large glitch resistor, just current sensor and fast cut off for the transformers. All have choke filter inputs, so have mine. The largest fil
My result on a 3-phase power supply with a 3800V AC transformer is a drop to 5162V from 5400VDC at 2.4A load. The capacitor is just 2ĩF, no choke input in this one. That capacitor does the same as a
Itīs the opposite. The required capacitance of the load-C of a simple Pi network is much larger then that of a Pi-L, a big advantage beside the much besser harmonic supression and easier tuning. The
Hi Jim, Paul,WD7S is using Pi-L with his 8877 autotune allband amp, his layout looks quite practical to me. The tank layout is also linked on that page: http://home.earthlink.net/~wd7s/gallery-5a.htm
I built a 4CX1000A push-pull amp for 2m in the past, it did about 3KW+ output and was extremely clean. A couple of friends built them also with the same experience. 73 Peter, DJ7WW --Original Message
That less output is caused by the load line used with Eimacs specification which is more A then AB1 resulting in lower efficiency and lower intermodulation distortion. The 4CX1500B however can be dri
And the 5CX1500A is used in mine, nice tube as well 73 Peter, DJ7WW That's why my HB linear has a 4CX1500A. David KW4DH _______________________________________________ Amps mailing list Amps@contesti
I could take pictures, none available at present. It is a 20m mono band amp, a modified plasma generator by Perkin Elmer, the 3000D. I will build amps for other bands too, as I obtained some more tub
Fibreglass is a very poor isolator, especially when wet. It turned into flames at the 1KW level already when I used it at a high impedance point. 1 5/8" cable is rated for 32KW@30MHz permanent power
Donīt underrate the development problems with solid state amps doing the same power as two or three 3CPX800A7 or similar. One of the big problems is the low pass filter, high power Micas or NP0 ceram
A pair of MRFE6VP61K25H does 1.8KW on 2m quite nicely with IMD3 better then -40db. On HF itīs a bit difficult to get them working as far I know. 73 Peter, DJ7WW one tone, 9-46 db pep) it has to be se
With the air variables most problems are with the rotor contacts, better to use split-stator but used as load capacitors they become too bulky. Two years ago I had a problem on 10m with the vacuum an
Just step it down on the primary with a 90V auto transformer before touching the hv windings 73 Peter, DJ7WW Hi I just get my hands on a nice transformer but the volttage is too high. The transformer