3 Electrode gas regulators

316a · 25th January 2003, 12:18 PM

Hello Folks ,
I have pile of these very handsome STC/ITT loctal G180/2M gas regs which glow a very pretty pink colour . As I'm sitting on an enourmous pile of loctal sockets (plus I was a little bored!) , thought that pressing a few of these into action would be a good idea for my latest prototype . I've hunted down the datasheet which details a third electrode 'AA' , but what is this for ? On the datasheet (page 2) it shows an additional series resistor linking to this 'AA' pin but no value for this resistor is specified

http://frank.nostalgiaair.org/short/054/4/493.pdf

...what do I do with this pin ? Leave it floating or 'wing it' with something like 470k etc . Sorry for the naivity , any sensible suggestions welcome

316a

dhaen · 25th January 2003, 12:37 PM

Hi 316a,

I would hazard a guess that it's for reliable firing.
The 470k option sounds a good idea!

Cheers,

dhaen · 25th January 2003, 01:16 PM

316a,

Just noticed that on page 1 it gives the Uaa voltage.
By now you've probably already determined what's going on anyway.

Cheers,

316a · 25th January 2003, 01:22 PM

...you mean like a primer pin ? I fired them up without AA connected and the things still seem to work alright . I've been adding more resistors in parallel across them and it's sitting quite happily , only the ripple increases , probably as I've only bypassed each one with a 0.015uF oiler . I'm using these stacked so will connect AA to to A or each respective regulator . The wife should like these , just her colour !

316a

EC8010 · 27th January 2003, 12:57 PM

Are we talking punk pink or baby pink? A regulated HT supply with mercury vapour rectifiers (cue the safety posts) and these references could be a work of art.

316a · 27th January 2003, 01:20 PM

...certainly not a natural looking pink ! I'm tempted to add another pair of sockets and use a pair of these loctal QS108/45 EE things instead and a single G180/2M , making a stack of three per side . This would mean an 8 valve stereo concertina input stage ! I'm tempted to use a gas reg for the negative bias supply for the output stage , got so many of the things ! I have a set of RG1/250 mercury vapour , but this project will use the cheap as chips PY500a instead .

316a

25th January 2003, 12:18 PM	#1
316a diyAudio Member Join Date: Dec 2002 Location: West London	3 Electrode gas regulators Hello Folks , I have pile of these very handsome STC/ITT loctal G180/2M gas regs which glow a very pretty pink colour . As I'm sitting on an enourmous pile of loctal sockets (plus I was a little bored!) , thought that pressing a few of these into action would be a good idea for my latest prototype . I've hunted down the datasheet which details a third electrode 'AA' , but what is this for ? On the datasheet (page 2) it shows an additional series resistor linking to this 'AA' pin but no value for this resistor is specified http://frank.nostalgiaair.org/short/054/4/493.pdf ...what do I do with this pin ? Leave it floating or 'wing it' with something like 470k etc . Sorry for the naivity , any sensible suggestions welcome 316a

25th January 2003, 12:37 PM	#2
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Sensible? We'll see.. Hi 316a, I would hazard a guess that it's for reliable firing. The 470k option sounds a good idea! Cheers,

25th January 2003, 01:16 PM	#3
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Fired 316a, Just noticed that on page 1 it gives the Uaa voltage. By now you've probably already determined what's going on anyway. Cheers,

25th January 2003, 01:22 PM	#4
316a diyAudio Member Join Date: Dec 2002 Location: West London	Primer ...you mean like a primer pin ? I fired them up without AA connected and the things still seem to work alright . I've been adding more resistors in parallel across them and it's sitting quite happily , only the ripple increases , probably as I've only bypassed each one with a 0.015uF oiler . I'm using these stacked so will connect AA to to A or each respective regulator . The wife should like these , just her colour ! 316a

27th January 2003, 01:20 PM	#6
316a diyAudio Member Join Date: Dec 2002 Location: West London	.hmmmm ...certainly not a natural looking pink ! I'm tempted to add another pair of sockets and use a pair of these loctal QS108/45 EE things instead and a single G180/2M , making a stack of three per side . This would mean an 8 valve stereo concertina input stage ! I'm tempted to use a gas reg for the negative bias supply for the output stage , got so many of the things ! I have a set of RG1/250 mercury vapour , but this project will use the cheap as chips PY500a instead . 316a

27th January 2003, 12:57 PM	#5
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Are we talking punk pink or baby pink? A regulated HT supply with mercury vapour rectifiers (cue the safety posts) and these references could be a work of art.

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