Sorry it took so long to get back....I have been fighting the "Slings and Arrows of outrageous fortunes".
Paws, just out of curiousity what did you drive your amp with? I know that all is needed is about 100 watts pep per tube. But I ain't worried about max at this point.
I am driving it with a Yaesu FT-101 which is lucky to get 100 watts total (I am running about 50 watts DK). My grid current is around 150 mills per tube (low) and, I am running 1200 mills Plate current out of 2 tubes.
I used a PD 2800V @ 1.5 A CCS transormer for plate. Probably should have gone slightly bigger, then as I said, not looking to squeeze every watt out of tubes.
My bench supply is not up to the job (2 JB-2000 transformers wired either in parallel for 2500 volts at 1 amp or in series for 5,000 volts @ 500 mills). Working on getting my larger supply done, I just need a safety enclosure.
And yes I install 2 27 ohms resistors in parallel. For glitch resistor. They are rated at 20 watts each. Also installed 4 inch piece of #30 gauge enameled wire on 4 inch ceramic standoffs. For HV fuse.
My glitch resistor is in my bench supply; I was strongly advised against using the piece of wire as a HV fuse, I was told that the high current conditions could substain an arc via the vaporized pieces of the wire.
Soft start.
Did not see a need for a soft start with the tubes but, I bring the HV up with a variac after a warm up period for the tube.
Installed a HV meter and a few other features. One thing I would like to install yet but not sure how to yet is install circuit so that if there is a problem with HV circuit, like a short or something. Trying to figure out circuit so that if there is a problem it will keep circuit at lower voltage instead of full power. Some kind of sense circuit.
I install a B+ meter in everything I build. The Triode control board is my main saftey circuit, I could wire it so that if it reaches a certain current level, the keying circuit would open.
I used 15kv vacuum variable caps for both plate and load.
My Plate Tune variable is 3-50 pf @ 25KV while, my Antenna Load is 20-1000 pf @ 10 KV.
I have a high impedance choke I installed on tank circuit if blocking caps would short. I used 2 680pf @ 20kv in parallel for blocking caps. Amp was built for mono band use. Used PI circuit for input and output.
I used an "L" network for the input and a standard Pi-network for the output.
Only thing that might be an issue is I used a single bias circuit to operate both tubes.
I have separate Filament supplies, Triode boards and, plate current meters for each tube; each tube is protected from over current by a fuse in the B- line. I have a meter to monitor the total current in the B- line. My B- is 1 ohm above ground, the voltage drop across the resistor to ground tell me my total grid current (cannot monitor grid current on each tube individually). You need separate bias controls on large tubes as these because of the potential difference in gain of the tubes (ask me, I know; had me going in circles till I balanced the currents).
I was able to use 2 of the radio shack 12.6 volt @ 3 amps for filament.
I doubled up and used 2 of the Radio Shack transformers per tube (total of four), my filament volts are running at 12.9 volts about 2% high, when I ran off of just one, the filament voltage sagged below a point that I was happy with.
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