The datasheet for the Russian GI7B triode says the maximum anode voltage for "continuous wave generation" is 2.5KV, so about 5KV peak. However the rating is 12KV for pulse operation. Flashover would
I ran a pair at about 3KV for a long time. Once you get beyond about 2400V, the risk of a glitch goes up. The transformer had a variety of secondary taps and I could dial it in pretty close. Tube i
From EIMAC: Positive ions are formed through ionization of residual gasses. High anode voltages speed formation of positive ions. The space charge (electron cloud) surrounding the cathode repels posi
<Has anyone tried 3KV or more with a GI7B? <73, Alan G3XAQ Temp bond the grid to the cathode.... then hi-pot between anode to grid. lower. Install a fast HV fuse in series with a 50 ohm glitch resist
Hipot is good for a relative indication but not an absolute one. As the tube gets hot the BDV can change and the tube can glitch. Also the GI7BT is easier to cool than the GI7B due to the different c
I agree here Jeff. Sans doing a hi-pot test on the tube as Jim suggested verifying its withstanding voltage, I'd install a fast HV fuse and glitch resistor in series with the plate feed, enabling the
Due to the tube's design it's easy to create transverse coolers and use them in MLA2500s If you have access to a milling machine, or know a machinist. 73, Roger (K8RI) Sans doing a hi-pot test on the
I have what's basically a Clipperton QRO that I've been converting to GI7BT tubes. Still yet to finish that project but I've gotten one step closer by having a custom PCB made that duplicates the tun
The problem with that and some other Russian triodes is that they are low mu and make poor SSB amps with poor IMD. Running in GG takes a lot of drive and HV for reasonable effficiency. They make nice