[Amps] Bang

[Dennis Watkins]

As it turns out, the "HV" relay shorts between
the mounting stud and the coil wiring. The vacuum
must be gone.  anybody know where I can get
a "good" relay??

Dennis  W7JX



Phil Clements wrote:

> > The glitch resistor is 10 ohm at 20w..
> > The transmitter puts out 1500w with
> > ease on 75 meters as long as I don't
> > bring the plate volts above 4-4.5 KV.
> >
> > As I said earlier,  it didn't blow with 22k 20 w
> > resistor as glitch resistor.  Didn't show any
> > tendency to arc anywhere..
>
> The glitch resistor needs to be adjusted in ohms
> (20-50) and wattage (50-100) until it will not self-
> destruct while the CB's or fuses in the primary of your
> plate transformer are shutting things down.
>
> Also, as you pass 4 kv going up, strange things begin
> to happen to insulating material. You surely are not trying
> you use plastic HV connectors for the B+ lead, are you?
> 30 kv #20 copper spark wire is good for this purpose,
> hard-wired, with no connectors involved. You also might
> have bypass caps that are shorting as the HV is increased.
> 22 K ohms is no longer a glitch resistor. At 20 watts, I am
> surprised that the tiny wire can handle the current you are
> drawing to obtain 1500 watts out.
>
> To give a simpler answer, your tube is either arcing internally,
> or you have an external short somewhere between the anode and the
> "glitch" resistor.
>
> (((73)))
> Phil, K5PC