Bruce, You can add more cathode bias to accomplish this. Just keep in mind that as you increase the bias voltage more rf drive will be needed to reach a given plate current and power output level. So
Bill, this is a wild guess on my part and assuming a linear class of operation: Bias voltage for triodes is much lower typically than a similar power tetrode. To achieve a decent power output level,
Hal, please tell us more about Tom Hand. This is a new name/source for me. 73, Gerald K5GW In a message dated 2/23/2006 10:33:01 A.M. Central Standard Time, ka1xo@juno.com writes: In my current proje
When I saw Barrie's email about this I wondered if an isolation transformer is needed. Is it needed? 73, Gerald K5GW In a message dated 2/28/2006 11:57:42 A.M. Central Standard Time, jtml@lanl.gov wr
Martin, your hv power supply has a capacitor style filter circuit. The peak current drawn from your AC line can be as high as 10 times the average current. When you observe the 2.5vac sag this is an
I have not had the time to get back to experimenting with the Panasonic Inverter Microwave oven HV supply. Have any of you had a chance to actually use one? I did some experiments and was able to con
Hal, I am absolutely in awe of a man having a wife that makes all that acceptable. It is a scenario that the rest of us can only fantasize about! 73, Gerald K5GW In a message dated 3/15/2006 2:43:21
Can someone explain what the shunts in these transformers are about? I can see what looks like a stack of four thin strips of metal placed below the secondary winding through the two core openings. I
Thanks Will and John; I now have an understanding of the heating issues with the MOT. It appears that these transformers are really a poor choice for continuous operation such as a filament power sou
Hi All, just based on the dc voltages produced, not accounting for IR losses, core losses,etc: 3000vdc .5A is 1500 watts delivered to the load. A choke filter typically delivers .9 times rms secondar
We are trying to match 50 ohms to the tube plate under full power output conditions for the class of operation. Full power output happens with full drive, maximum plate current and whatever plate vol
BTW, on the discussion of k=1.8 vs. 1.87 in the calculations: There is less than 4% difference between these two values. The difference can be covered by only a small "tweak" of the loading and tunin
Peter, I can't make this information agree with practice. For example, I have a TH347 amplifier on 23cm that runs 3000vdc at 1.8A on the plate. Conventional design would yield a plate impedance of 92
This info may or may not apply to the relays Rich is offering. Hopefully he can make comment since he can measure the breakdown voltage for his relays. The contact voltage is what we usually worry ab
Reading in the Jennings catalog: "RJ1H-26s is similar to RJ1A except designed specifically for DC hot load switching". In my mind, this implies that the RJ1A is NOT designed for hot switching. The de
Jeff, 5400 ohms plate load flies into the face of what we have been calculating using the K factor stuff. 3000v/1A/1.8 is equal to 1666 ohms so one of your numbers is flawed. Using the other method,
Yes, that should be 3000 divided by 1.8 = 1666.6 ohms. In this case power equals current squared times load resistance which is 1666.6 watts. This power level is consistent with 3000 watts input and
David is correct; in the RCA TT5 manual, page 53, step 16, it shows Ibmax in the equation. 73/k5gw In a message dated 4/10/2006 7:10:12 P.M. Central Standard Time, dhallam@rapidsys.com writes: Will,
Jeff, I misread your example and took your peak current of 1 A as the average current. Your 5400 ohm plate load is exactly correct for the example and I must sincerely apologize for my confusion. I h
Will and all, as you have determined, the k=1.8 is an approximation that will keep you inside the ballpark at least. Each tube type has it's own characteristics that will cause a shift up or down fro