Tube ID 18R-AL1?

Trout · 17th November 2005, 11:34 PM

I have been cleaning my tube storage up all day, sorting potentially fun tubes from tubes to put into deeper storage.
After searching many tube data sites, I came across an a sleeve of interesting looking Tubes.
18R-AL1 ?
Sylvania labeled boxes, Sylvania labeled tube import from japan.
Looks alot like a possible triode/pentode combo.
I checked the usual online data sheet sites and I am drwing blanks on this one.
Anyone have a data sheet on this?
Gene

Tom Bavis · 18th November 2005, 01:55 AM

Closest I found was a listing in Precision 660 tube data - appears to be a dual triode with 18V filament.

cpu_bach · 18th November 2005, 12:37 PM

Yes, this is a twin tridode with 18V heater supply. These tubes were widely used for telecommunication equipment for wired telephone systems.
Best regards.

17th November 2005, 11:34 PM	#1
Trout diyAudio Member Join Date: Nov 2004 Location: Midwest Madman	Tube ID 18R-AL1? I have been cleaning my tube storage up all day, sorting potentially fun tubes from tubes to put into deeper storage. After searching many tube data sites, I came across an a sleeve of interesting looking Tubes. 18R-AL1 ? Sylvania labeled boxes, Sylvania labeled tube import from japan. Looks alot like a possible triode/pentode combo. I checked the usual online data sheet sites and I am drwing blanks on this one. Anyone have a data sheet on this? Gene

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18th November 2005, 01:55 AM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Closest I found was a listing in Precision 660 tube data - appears to be a dual triode with 18V filament.

18th November 2005, 12:37 PM	#3
cpu_bach diyAudio Member Join Date: Jun 2004 Location: Yokohama	Yes, this is a twin tridode with 18V heater supply. These tubes were widely used for telecommunication equipment for wired telephone systems. Best regards.

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