>> Everyone seems to agree that a glitch resistor between the plate choke
>> and the HV supply is a good idea, to limit huge current surges due to
>> arcs caused by gas, etc. But recommendations for the value seem to vary
>> all over the map.
> I like the look of Vishay RCH series or similar (Tyco do an
> equivalent). The 50W version is rated at 5.5W without heatsink and
> is specified to handle 2500Vrms (that's 3500V peak) short term
> overload. If you want to bolt it to a panel for heatsinking, the
> insulation is rated for 3500Vrms (5kV peak).
Checking page 4 of the datasheet for the RCH50
shows a maximum overload capability of about 50 Joules.
A capacitor bank for a linear of 50uF charged to 3kV will deliver about 225
under glitch conditions the resistor will be absorbing most of this power, more
the power supply doesn't have glitch detection/protection and remains connected
to the mains.
In order words to be safe you'll need about five RCH50 resistors in series.
I don't know what energy the tube can absorb under flash over conditions
damage and this will also influence the selection of the resistor.
Make a mini you and download it into Windows Live Messenger
Amps mailing list