rectifier tube question

jtsjf · 9th April 2004, 06:06 PM

Hi all, I have a question about rectifier tubes and I would appreciate if anyone could answer or point me to an answer. In a 5Z3 or a GZ32 there are four pins- two heater and two for the rectifier. In a GZ34, there are five pins- the 'extra' pin #1 is just listed as "internally connected". Internally connected to what? Not the heater (at least it doesn't look that way on the pinout).
Also, pin 8 is listed as the filament and cathode. Does that mean if I connect to DC heating, I should pin 8 as cathode, pin 2 as anode?
The reason I ask (on top of just being ignorant) is that someone gave me a couple of GZ34's and I was going to try them in my amp (currently using 5Z3PA). I do recognize that they have different heater requirements (GZ34 uses less) and that I need to be aware of the differences in voltage drop.
thanks for any info, comments.

Jason

Sch3mat1c · 9th April 2004, 08:44 PM

Internal connections can be anything and typically shouldn't be used. They might be unconnected, maybe the getter is hanging off it, it might be a shield, or even connected to some other pin - if in doubt, leave it open. If the EIA says that pin is "IC" then the manufacturer can make it pretty much anything they wish.

On all the rectifiers I know of with such basing, it is unconnected. Think of it as a visual "key" for how to insert it.

Tim

Eli Duttman · 10th April 2004, 10:40 PM

In 1/2 indirectly heated tubes, like the GZ34 (5AR4) and the GZ32 (5V4), the cathode sleeve, along with 1 end of the heater, is connected to pin 8. That's why you take the B+ from pin 8.

Some versions of the GZ34/5AR4 have a metal collar on the base. I would think that that collar is connected to pin1 for grounding purposes.

jtsjf · 11th April 2004, 07:03 PM

Thanks guys,

I'll check the outer sleeve for continuity.

Cheers,
Jason

9th April 2004, 08:44 PM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Internal connections can be anything and typically shouldn't be used. They might be unconnected, maybe the getter is hanging off it, it might be a shield, or even connected to some other pin - if in doubt, leave it open. If the EIA says that pin is "IC" then the manufacturer can make it pretty much anything they wish. On all the rectifiers I know of with such basing, it is unconnected. Think of it as a visual "key" for how to insert it. Tim __________________ Seven Transistor Labs Projects and Resources

10th April 2004, 10:40 PM	#3
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	In 1/2 indirectly heated tubes, like the GZ34 (5AR4) and the GZ32 (5V4), the cathode sleeve, along with 1 end of the heater, is connected to pin 8. That's why you take the B+ from pin 8. Some versions of the GZ34/5AR4 have a metal collar on the base. I would think that that collar is connected to pin1 for grounding purposes. __________________ Eli D.

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9th April 2004, 06:06 PM	#1
jtsjf diyAudio Member Join Date: Jan 2004 Location: Midwest	rectifier tube question Hi all, I have a question about rectifier tubes and I would appreciate if anyone could answer or point me to an answer. In a 5Z3 or a GZ32 there are four pins- two heater and two for the rectifier. In a GZ34, there are five pins- the 'extra' pin #1 is just listed as "internally connected". Internally connected to what? Not the heater (at least it doesn't look that way on the pinout). Also, pin 8 is listed as the filament and cathode. Does that mean if I connect to DC heating, I should pin 8 as cathode, pin 2 as anode? The reason I ask (on top of just being ignorant) is that someone gave me a couple of GZ34's and I was going to try them in my amp (currently using 5Z3PA). I do recognize that they have different heater requirements (GZ34 uses less) and that I need to be aware of the differences in voltage drop. thanks for any info, comments. Jason

11th April 2004, 07:03 PM	#4
jtsjf diyAudio Member Join Date: Jan 2004 Location: Midwest	Thanks guys, I'll check the outer sleeve for continuity. Cheers, Jason