5842 / 417A

Measurements were taken using 150V/30mA plate, 2K2 load or 20H/50mA choke. Output filter is 1uF/100K, input resistor is 47K

RC Loading

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Very excellent results for low frequency response.

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Even better specs for the high range, who'd have thunk it!

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Frequency range of 2Hz - 2Mhz and up (my sine generator won't go over 2MHz)... WOW!

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Maximum output equals 23Vrms (due to 2K2 load this setup has a low gain). Beyond this the grid goes into positive swing and starts to clip.

LC loading

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Fair results down to 40Hz, after that the choke starts to take effect. Still not "terrible" though".

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The high region is very much affected by the capacities of the choke windings as seen in the rounding effect.

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Frequency range between 6.5Hz and 743kHz, not bad eh! A higher choke value should lower the bottom frequency.

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Maximum output equals 116Vrms (gain is very high in this setup).