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Old 17th Jul 2006, 7:18 pm   #14
YC-156
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Join Date: May 2005
Location: Aarhus, Denmark
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Default Re: should this work?

Quote:
Originally Posted by adibrook
Would it be possible to use a resistive anode load for now? I will just be connecting it to a scope. Then, if it works properly, i will change it to an LC.

What sort of value anode resistor would that need?
You will need three resistors if you want to maintain the current 250V supply voltage:

Two connected in series from 250V to the anode, pin 5: One 56K / 1W and one 10K / 1W. The 10K should be closest to the 6BE6. The midpoint of the two series connected resistors should be decoupled with a 10nF / 350V disc ceramic capacitor or similar directly to ground.

One 27K / 2W connected from 250V and to g2+g4, the screen grid, pin 6. Pin 6 should also have a 10nF / 350V disc ceramic cap as decoupling connected right at the valve base. This is the one labelled C7 in the schematic.

These resistances may be a bit off from the optimum values, but they should get you started without burning out the 6BE6.

Best regards

Frank N.
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