The DeForest 504 tube

yourownfree · 28th September 2009, 06:59 AM

I have a couple of DeForest tubes I cant find any info on. They are in great shape. They look new in fact. The problem is I don't have any data on them.
They have the word DeForest and 504-A written on the base of them. They are about 14 inches tall. If I am right, as I recall the anode cap is on top and the grid is on the side with a metal cap as well. Any info would be appreciated. I have been looking for a long time. I would say they have at least a 500 watt dissipation rating. That of course is just my visual and I don't have proof. I am thinking an old broadcast transmitter tube.

Glowbug · 28th September 2009, 08:27 AM

Lee De Forest was the inventor of the triode...it's odd, Googling doesn't find much, I tried looking through QRZ's forum (a ham radio site) too. I have no idea if these links are valid or not, but if nobody else can help you, these guys probably can: http://www.tubecollectors.org/

Whatever it is, it probably hasn't been in common use for a long time.

yourownfree · 04:16 PM

Thanks, I sent them an email to see what happens. here is what it kinda looks like. I guess I need to get a pic of them.

28th September 2009, 06:59 AM	#1
yourownfree diyAudio Member Join Date: Apr 2008	The DeForest 504 tube I have a couple of DeForest tubes I cant find any info on. They are in great shape. They look new in fact. The problem is I don't have any data on them. They have the word DeForest and 504-A written on the base of them. They are about 14 inches tall. If I am right, as I recall the anode cap is on top and the grid is on the side with a metal cap as well. Any info would be appreciated. I have been looking for a long time. I would say they have at least a 500 watt dissipation rating. That of course is just my visual and I don't have proof. I am thinking an old broadcast transmitter tube.

28th September 2009, 08:27 AM	#2
Glowbug diyAudio Member Join Date: Feb 2006 Location: Hillsborough, NC/McLean, VA	Lee De Forest was the inventor of the triode...it's odd, Googling doesn't find much, I tried looking through QRZ's forum (a ham radio site) too. I have no idea if these links are valid or not, but if nobody else can help you, these guys probably can: http://www.tubecollectors.org/ Whatever it is, it probably hasn't been in common use for a long time. __________________ Jim J.

28th September 2009, 04:06 PM	#3
yourownfree diyAudio Member Join Date: Apr 2008	Thanks, I sent them an email to see what happens. here is what it kinda looks like. I guess I need to get a pic of them. Last edited by yourownfree; 28th September 2009 at 04:16 PM.

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