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
regard tony ma
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
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
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
The 80 was essentially a 5Y3 on a UX 4 base.
Barry
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
The 1955 Mullard (Philips) valve maintenance manual doesn`t list the 5Z3 but shows the 80 as current production.
Barry
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
Mickeystan
- Status
- Not open for further replies.