RCA tube rectifier

blindmouse · 21st July 2008, 01:24 PM

My Fender Champ came with a RCA agx GZ tube rectifier instead of a stock 5Y3GT. RCA agx GZ is written on the foot of the tube. There is no more information (it's a black plate). Not on the foot, nor on the glass.
What kind of tube is this. My amp is running ok with it.

Regards

Frank Berry · 21st July 2008, 02:09 PM

The tube may be a GZ34 (5AR4).

Tom Bavis · 21st July 2008, 02:33 PM

RCA generally marked the glass above the key in the base. Try breathing on the tube there and look at that area. Usually it's in an octagon.

whitelabrat · 21st July 2008, 07:40 PM

agx GZ sounds like a manufacturing code and not the tube type. Mr. Bavis is correct where the tube type is usually printed on the glass. It's not unusual for it to rub off, so you may have to look carefully under good lighting to find the markings. If they're missing just look for pictures of RCA 5Y3GT's, 5U4G, and 5AR4 to compare to. Ebay is a good source of photos.

DHT112A · 22nd July 2008, 02:19 AM

What I have found to work quite often is to put the tube in the freezer. Ice may form differently where the number is making it visible. You still have to look closely.

21st July 2008, 01:24 PM	#1
blindmouse diyAudio Member Join Date: Jul 2008	RCA tube rectifier My Fender Champ came with a RCA agx GZ tube rectifier instead of a stock 5Y3GT. RCA agx GZ is written on the foot of the tube. There is no more information (it's a black plate). Not on the foot, nor on the glass. What kind of tube is this. My amp is running ok with it. Regards

21st July 2008, 02:09 PM	#2
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	The tube may be a GZ34 (5AR4). __________________ Frank

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21st July 2008, 02:33 PM	#3
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	RCA generally marked the glass above the key in the base. Try breathing on the tube there and look at that area. Usually it's in an octagon.

21st July 2008, 07:40 PM	#4
whitelabrat diyAudio Member Join Date: Dec 2006 Location: Maryland	agx GZ sounds like a manufacturing code and not the tube type. Mr. Bavis is correct where the tube type is usually printed on the glass. It's not unusual for it to rub off, so you may have to look carefully under good lighting to find the markings. If they're missing just look for pictures of RCA 5Y3GT's, 5U4G, and 5AR4 to compare to. Ebay is a good source of photos.

22nd July 2008, 02:19 AM	#5
DHT112A diyAudio Member Join Date: Jun 2005 Location: Tacoma , WA	What I have found to work quite often is to put the tube in the freezer. Ice may form differently where the number is making it visible. You still have to look closely.

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