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Old 9th April 2004, 06:06 PM   #1
jtsjf is offline jtsjf  United States
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Default 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
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Old 9th April 2004, 08:44 PM   #2
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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
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Old 10th April 2004, 10:40 PM   #3
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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.
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Old 11th April 2004, 07:03 PM   #4
jtsjf is offline jtsjf  United States
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Thanks guys,

I'll check the outer sleeve for continuity.

Cheers,
Jason
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