anyone recognize this valve?

mr l · 10th August 2010, 12:41 PM

hello,

it was given to me when I purchased some other valves, I wish to use it but I need to find the specs, rectifier valve I believe, directly heated, no type label but some numbers on the side. any ideas? any help would be great.

cheers,

makaiyumtony · 10th August 2010, 01:27 PM

It is hard to tell by that three numbers, if you can adjust the AC voltage in put,( 100v to 400v) try to connect to pin 4 and 6, 5v DC to pin 2 and 8, load up with a power resister (25w and up 5k in value) from pin 8, center tap of the AC is the ground, use a DC current and volt meter to check the relation between AC in and DC out, then you will know how to use it
regard tony ma

Mickeystan · 10th August 2010, 02:11 PM

Hello Mr L

This tube looks a lot like an early full wave rectifier tube that was known as a type 80. You can look up the specs for a type 80 on Ducan's site or others.

Mickeystan

barrymagrec · 10th August 2010, 08:05 PM

I agree, it`s hard to see the base type but it looks very much like an 80.
The 80 was essentially a 5Y3 on a UX 4 base.

Barry

kevinkr · 10th August 2010, 09:42 PM

Looks like an 80 to me too..

leadbelly · 10th August 2010, 09:49 PM

Quote:

Originally Posted by makaiyumtony

It is hard to tell by that three numbers, if you can adjust the AC voltage in put,( 100v to 400v) try to connect to pin 4 and 6, 5v DC to pin 2 and 8, load up with a power resister (25w and up 5k in value) from pin 8, center tap of the AC is the ground, use a DC current and volt meter to check the relation between AC in and DC out, then you will know how to use it
regard tony ma

Pins 6 & 8 might be a challenge!

DrRick · 10th August 2010, 10:44 PM

5z3 ?

rotaspec · 11th August 2010, 07:06 AM

Yes, looks identical to my 5Z3 here

barrymagrec · 11th August 2010, 07:17 AM

Looks too small for a 5Z3 to me but the easy check is heater current, 2 amps for an 80, 3 amps for a 5Z3.
The 1955 Mullard (Philips) valve maintenance manual doesn`t list the 5Z3 but shows the 80 as current production.

Barry

Mickeystan · 11th August 2010, 01:11 PM

One other point that may help to determine if this tube is a 80 or a 5Z3 is the height of the top of the tube to the bottom of the pins. A type 80 is built in a ST14 envelope and will be something on the order of 4 1/16" tall. If it is a 5Z3, it will be built in a ST16 envelope and will be more like 5 3/8" tall.

Mickeystan

10th August 2010, 09:42 PM	#5
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Looks like an 80 to me too.. __________________ www.kta-hifi.net

10th August 2010, 10:44 PM	#7
DrRick diyAudio Member Join Date: Nov 2004 Location: New Jersey, US, Third Stone From The Sun	5z3 ? __________________ Peace, DrRick

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10th August 2010, 01:27 PM	#2
makaiyumtony diyAudio Member Join Date: Dec 2009 Location: whitby ont	It is hard to tell by that three numbers, if you can adjust the AC voltage in put,( 100v to 400v) try to connect to pin 4 and 6, 5v DC to pin 2 and 8, load up with a power resister (25w and up 5k in value) from pin 8, center tap of the AC is the ground, use a DC current and volt meter to check the relation between AC in and DC out, then you will know how to use it regard tony ma

10th August 2010, 02:11 PM	#3
Mickeystan diyAudio Member Join Date: Jan 2008	Hello Mr L This tube looks a lot like an early full wave rectifier tube that was known as a type 80. You can look up the specs for a type 80 on Ducan's site or others. Mickeystan

10th August 2010, 08:05 PM	#4
barrymagrec diyAudio Member Join Date: Apr 2010	I agree, it`s hard to see the base type but it looks very much like an 80. The 80 was essentially a 5Y3 on a UX 4 base. Barry

11th August 2010, 07:06 AM	#8
rotaspec diyAudio Member Join Date: Nov 2007	Yes, looks identical to my 5Z3 here

11th August 2010, 07:17 AM	#9
barrymagrec diyAudio Member Join Date: Apr 2010	Looks too small for a 5Z3 to me but the easy check is heater current, 2 amps for an 80, 3 amps for a 5Z3. The 1955 Mullard (Philips) valve maintenance manual doesn`t list the 5Z3 but shows the 80 as current production. Barry

11th August 2010, 01:11 PM	#10
Mickeystan diyAudio Member Join Date: Jan 2008	One other point that may help to determine if this tube is a 80 or a 5Z3 is the height of the top of the tube to the bottom of the pins. A type 80 is built in a ST14 envelope and will be something on the order of 4 1/16" tall. If it is a 5Z3, it will be built in a ST16 envelope and will be more like 5 3/8" tall. Mickeystan

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