Good Morning All... ...And many thanks to the SEVEN respondents who took the time to address my query yesterday re. the whys & wherefores of my old Barker & Williamson type "FC-30" filament choke...
Eddy, I recall an article in QST many years ago about TVI elimination in which fly back TV cores were used. I believe there was a comment that these cores are low frequency jobs and, in the TVI funct
Hi All, is there no possibility of having the input matching network resonate with the FC30 filament choke to allow 160m operation? With the low impedances present it seems that the loaded Q would st
Assuming you're running connected as a grounded grid triode, the choke will appear as a shunt inductance to ground - can you simply choose the right capacitor to tune it to parallel resonance on 160m
I have a pair of 813's in GG that I built many years ago and I built a filament choke from a TV flyback core. It works fine. If I remember right I cut the ends off one of the C sections to make a st
TV horizontal oscillators worked (work?) at about 15 KHz. So who knows how this core would work at 160 meters? -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___________________________________
There is a possibility but a 4-1000A would be one of the worse possible cases for using that choke. Filament currents, assuming the choke is wired and wound correctly, do NOT magnetize the core. The
Eddy, get an FC-25 from RF parts or Surplus sales of Nebraska. They are like $35 Good Morning All... ...And many thanks to the SEVEN respondents who took the time to address my query yesterday re. th
I HAVE A B&W 15A FILAMENT CHOKE FOR SOMEONE IF THEY NEED IT FOR $25.00 INCLUDING SHIPPING IF THEY LIKE. (THE $20.00 PRICE REFLECTS STORAGE FEES ONLY FOR THE LAST TWENTY YEARS OR SO! VAN, k7vs -- Orig
I have some OLD FC-30 chokes in metal boxes with 4 terminals on each end. One had a bad internal connection so I pried open the box and found that it was made of ferrite or powdered iron toroids not
Ahhhhh HA, They built two different versions of the FC-30 apparently. The toroidal version obviously the FC-30A I had always wondered what the difference was from an FC-30 and an FC-30A. The box look
On 5th March Bob wrote... ** About the only reference that I've managed to find re. any possible difference(s) between these two generations of filament chokes (and be assured that I have NOT delved
The one I opened looked like they stole loopstick antennas from a 1960's 6 transistor AM radio. It had a whole pile of little flat ferrite cores that were wide and thin and long all bonded together