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Help please with driver tube bypass

d1g1man

Member
Feb 25, 2008
50
0
16
I have one of the old KRIS power pumps that I changed the caps and diodes in. It works real nice and is in great condition.

Here is a link to it that shows a photo of it.
Kris Inc. Power Pump

It requires a very low drive requirement, I would like to modify it to be able to be driven with a higher wattage.

I have researched this and found that it can be done two ways.

1. Add a 100 ohm non-inductive resistor and a 1kv .05 ceramic cap in series from pin 3 to ground.

2. Omit the driver tube (6JG6A) and drive the main tubes (2 x 6LQ6) directly.

I prefer the latter.

I admit that I am not competent enough to figure this out. But I can follow directions very well.

If someone would please tell me how to omit this driver tube while still retaining a decent input VSWR I would be eternally grateful!

Here is a link to the schematic from cbtricks in .jpg format.
http://www.cbtricks.com/Amp/kris/power_pump/graphics/kris_power_pump_sch.gif
 

Turn the amp off and take a long, insulated screwdriver and make sure that the high voltage is bled off.

Pull the driver tube.

Re-direct the wire from Pin 3 of the driver tube to Pin 3 of the final tubes.

Lift L3 where it connects to the final tubes (Pin 3) and tape it off, this removes the output from the driver tube.

Check your work and fire it up.

.
 

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