6922 for a Noob

Fuzzymuff · 28th June 2009, 03:07 AM

Hello all. I bought a 6922 about 4 year ago with view to learning somthing. I just knocked up a heater, 6.3vdc supply using a 317T adjustable regulator. I wired it to Pin 4 & 5 of a 9BA socket and proceeded to plug in my tube and firing it up, I was dissapointed not to see a glow. I didn't want to build an audio stage until I could supply a heater power supply.

Did I miss something. I've Googled at Data sheets etc and got linked here. I think I should have came here first seeing as I'm already a member.

Please, where have I gone wrong?

Thanks Fuzzy Muff

rdf · 28th June 2009, 03:21 AM

I'm not near a receiving tube manual but noticed the Raytheon spec sheet lists the socket type as 9DE. Do you have an ohmeter? The shorted pin pairs are either filaments or a pooched tube.

HollowState · 28th June 2009, 03:37 AM

Yo Fuzzy,
Are you getting 6 volts at the socket?
Do you have it with the tube plugged in?
Did you count clockwise from the socket bottom for pins 4 & 5?
Does the tube have filament continuity?
Does the tube get warm?
Is there lots of getter at the top preventing you from seeing any glow?

boywonder · 28th June 2009, 06:37 AM

Are you sure that you have no glow even in a dimly lit room? Can you post a schematic?

Fuzzymuff · 28th June 2009, 11:35 AM

I'm correctly wired at pins four and five. I got 6.3 volts with no tube, and plug it in and theres about a volt there. The tube does not glow or get warm 5.4 ohms across pins 4 and 5.
I'm 38 years old and never played with a tube, I'm ashamed of myself. Maybe I need a bigger transformer. I bought the tube as I said, but the other bits are recycled. I guesstimated the tranny size, figured if it wasn't strong enough, it would get hot??? Right?

Fuzzymuff

Frank Berry · 28th June 2009, 12:31 PM

Measure the voltage across the transformer with the tube in the socket. If the voltage has sagged more than a volt or so, the tranny is too small.
Is the 317T heatsinked properly?

Fuzzymuff · 28th June 2009, 12:43 PM

My Transformer started out at 25.5 volts ac, no load, ( nothing connected to the wires), now, loaded, its 16.6 Volts ac!

I'll come back in a while when I've attached a new Transformer.

Fuzzymuff · 28th June 2009, 12:54 PM

I'm getting carried away here.
I forgot to say Thank you.

So Thank you.

Back in a bit.

Fuzzymuff · 28th June 2009, 01:35 PM

Found a Toroid lighting transformer. 12volts ac 1.2Amp. Checked wiring and 6.3vdc across heater . Put tube in and nothing??? I'm using a 240 ohm resistor and a 5k preset on my LM317T.

My heatsink is oversized.

Fuzzymuff

SY · 28th June 2009, 01:58 PM

You do realize that pin numbers for tubes are taken looking at it from the bottom side?

28th June 2009, 03:07 AM	#1
Fuzzymuff diyAudio Member Join Date: Mar 2009	6922 for a Noob Hello all. I bought a 6922 about 4 year ago with view to learning somthing. I just knocked up a heater, 6.3vdc supply using a 317T adjustable regulator. I wired it to Pin 4 & 5 of a 9BA socket and proceeded to plug in my tube and firing it up, I was dissapointed not to see a glow. I didn't want to build an audio stage until I could supply a heater power supply. Did I miss something. I've Googled at Data sheets etc and got linked here. I think I should have came here first seeing as I'm already a member. Please, where have I gone wrong? Thanks Fuzzy Muff __________________ Wrap it in foil, and plug it in.

28th June 2009, 03:21 AM	#2
rdf diyAudio Member Join Date: Jun 2004 Location: the thermionic past	I'm not near a receiving tube manual but noticed the Raytheon spec sheet lists the socket type as 9DE. Do you have an ohmeter? The shorted pin pairs are either filaments or a pooched tube. __________________ Blame the Manichaeists

28th June 2009, 03:37 AM	#3
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	Yo Fuzzy, Are you getting 6 volts at the socket? Do you have it with the tube plugged in? Did you count clockwise from the socket bottom for pins 4 & 5? Does the tube have filament continuity? Does the tube get warm? Is there lots of getter at the top preventing you from seeing any glow? __________________ "The human race is just a chemical scum on a moderate-sized planet orbiting round a very average star in the outer suburb of one among a hundred billion galaxies." ~Stephen Hawking

28th June 2009, 11:35 AM	#5
Fuzzymuff diyAudio Member Join Date: Mar 2009	Hello again I'm correctly wired at pins four and five. I got 6.3 volts with no tube, and plug it in and theres about a volt there. The tube does not glow or get warm 5.4 ohms across pins 4 and 5. I'm 38 years old and never played with a tube, I'm ashamed of myself. Maybe I need a bigger transformer. I bought the tube as I said, but the other bits are recycled. I guesstimated the tranny size, figured if it wasn't strong enough, it would get hot??? Right? Fuzzymuff __________________ Wrap it in foil, and plug it in.

28th June 2009, 12:31 PM	#6
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	Measure the voltage across the transformer with the tube in the socket. If the voltage has sagged more than a volt or so, the tranny is too small. Is the 317T heatsinked properly? __________________ Frank

28th June 2009, 06:37 AM	#4
boywonder diyAudio Member Join Date: Jan 2008 Location: So.Cal.	Are you sure that you have no glow even in a dimly lit room? Can you post a schematic?

28th June 2009, 12:43 PM	#7
Fuzzymuff diyAudio Member Join Date: Mar 2009	Ahhhh! My Transformer started out at 25.5 volts ac, no load, ( nothing connected to the wires), now, loaded, its 16.6 Volts ac! I'll come back in a while when I've attached a new Transformer. __________________ Wrap it in foil, and plug it in.

28th June 2009, 12:54 PM	#8
Fuzzymuff diyAudio Member Join Date: Mar 2009	Back again I'm getting carried away here. I forgot to say Thank you. So Thank you. Back in a bit. __________________ Wrap it in foil, and plug it in.

28th June 2009, 01:58 PM	#10
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	You do realize that pin numbers for tubes are taken looking at it from the bottom side? __________________ "...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011

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