EL84 Shunt reg for pre-amp, 85A1?

tubee · 7th February 2009, 07:11 PM

I am rightnow changing my solid state TL783 regulated PS to a shunt regulator.

It uses a penthode, a BD139 transistor and 75V zener to function with some resistors.

I wonder if it would be possible to use a (OE3) 85A1 gas reference instead of the zener. zener is 75, gas ref. is 85 so that is no problem i guess. Only thing the 85A1 is igniting on about 125V, the zener starts to function immediate when 75V is reached.

But will first build the schematic with a zener see if it works. When i use the gas ref. i have to move the Xformer out of the cabinet for some space for the 2 gas ref tubes.

Any suggestions on the gas reference?

(will post schematic too)

tubee · 7th February 2009, 09:27 PM

Here is an example from my shunt reg. (tubecad)

But then a EL84 penthode is used, and a BD139 extra near the zener.

7th February 2009, 07:11 PM	#1
tubee diyAudio Member Join Date: Jul 2004 Location: Netherlands	EL84 Shunt reg for pre-amp, 85A1? I am rightnow changing my solid state TL783 regulated PS to a shunt regulator. It uses a penthode, a BD139 transistor and 75V zener to function with some resistors. I wonder if it would be possible to use a (OE3) 85A1 gas reference instead of the zener. zener is 75, gas ref. is 85 so that is no problem i guess. Only thing the 85A1 is igniting on about 125V, the zener starts to function immediate when 75V is reached. But will first build the schematic with a zener see if it works. When i use the gas ref. i have to move the Xformer out of the cabinet for some space for the 2 gas ref tubes. Any suggestions on the gas reference? (will post schematic too)

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7th February 2009, 09:27 PM	#2
tubee diyAudio Member Join Date: Jul 2004 Location: Netherlands	Here is an example from my shunt reg. (tubecad) But then a EL84 penthode is used, and a BD139 extra near the zener.

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