That gives me an idea. I have a Thunderbolt and if I go to solid state rectifiers, a capacitive input filter and then wire up the 866A's in parallel but in series with the filtered output I would sti
The Thuderbolt was really designed for the old CW operators running class C. Few had SSB when it came out. And under those conditions it did run the legal limit of 1KW plate input. I got one because
At 09:59 AM 9/1/2004 -0700, R.Measures wrote: On Sep 1, 2004, at 8:22 AM, Jim Isbell wrote: This is EXACTLY the answer I needed. The amp uses a pair of 4-125As and the screens are at "350V - 400V" Pl
Gee, I don't want that camel's nose in my tent! The best thing about ham radio is the lack of need for infrastructure and that the hams have always purchased or built their own equipment thus not bei
The concept of Amateur radio is wonderful. Imagine, here is a bunch of people that are willing to spend thousands of dollars of their own money, volunteer to provide training and testing, are availab
I think it has to do with the close proximity and precise alignment of the screen grids with the control grids so that screen grids are in the electron shadow of the control grids. I have not given i
At 12:07 PM 9/2/2004 -0400, Will Matney wrote: Bill, I was reading about this a while back. If I recall, the spacing between the screen grid and the anode in power tetrodes help control secondary emi
That reminds me. There is a guy every year at the Dayton Hamvention that sells aluminum boxes that he makes himself. Naturally I have no idea who he is or where his outside flea market spot was. He c
I picked up (cheap) a couple of power supplies used in a some motorola repeater which uses conduction cooled tubes in the final. Just got the power supplies. These seem to have ferro-resonant regulat
There would be too little magnetic coupling from two series resistors wound opposite directions for the field to cancel. Some N.I. wire wound resistors have two opposite direction wound coils such th
But, if you are only operating CW or FSK it is not needed. Due to the fact that intermodulation distortion is not an issue. You can operate class C. The only need for some ( very little) linearity on
There is grid current. That is how negative bias is generated when using a "grid leak resistor". It is bias by grid rectification. Two types of clamp circuits were used. One use the DC bias generated
That works. I had a 6L6 as clamp tube in my pair of 6146B ampifier since I was using plate modulation. But did not use in for larger amplifiers. 73 Bill wa4lav There needs to be a capacitor across th
What formulas would you use? By the way, one reason to modulate the screen grid along with the plate is to make the tetrode tubes' plate impedance appear to be more like a triode than a tetrode. The
I have a Henry 5KW plasma generator that has 2 paralleled single phase HV transformers in it. The only difference between this and the 3KW is one transformer. 73 Bill wa4lav At 04:15 PM 10/11/2004 -0
The manual claims that a single 4CX250B will produce 600 watts peak output. It has unregulated bias supplies as well. I wonder if that is figuring peak voltage squared divided by resistance rather th
Wide open, does that mean class C SSB? 73 Bill wa4lav At 03:10 PM 10/12/2004 -0400, craxd wrote: Bill, That amp, which really said was an amateur amp, was mostly sold to the 11 meter folks. The large
Besides the 3-400Zs glow brighter. Must add a window to appreciate! 73 Bill wa4lav At 01:12 PM 10/20/2004 +0200, DF3KV wrote: -- Original Message -- From: "Jason Buchanan" <jsb@digistar.com> To: <amp
I thought I was on to something but checked and was off one digit. A 7C24 is a 5762 which is a triode with 2.5 KW plate dissipation. Very common in older AM transmitters. Don't know about a 7C23. 73
If the tube has no getter baking out requires a high vacuum system. The gas has to go somewhere after being driven off the internal surfaces of the tube. There is another process called conditioning