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Old 30th April 2008, 08:22 PM   #1
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Default Bloody pinouts!

Hi,

When looking at the pinouts of a valve, which bloody way up is it?!

My bases have pin 1 labelled (looking from underneath) on the RIGHT side of the notch, but when looking from the top, that pin is Pin 8 according to all pinouts....

L
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Old 30th April 2008, 08:27 PM   #2
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Turn the tube upside down so you are looking at the pins. Pin 1 is to the left of the space and it continues clockwise around to the last one. So pin 9 for example would be the right hand side of the space. So if you had your sockets mounted and the amp upside down the orientation is the same.

In other words, the data sheet pin out is as if you had the tube upside down and you are looking directly down on the pins.

Fran
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Old 30th April 2008, 08:36 PM   #3
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Exactly what I'd figured, Fran.

If there is a NONCE OF THE YEAR award, please give it to me.

I measured the voltages, turned it over, and started again. Except I called the pin to the RIGHT of the notch Pin 1, and....you can see.

WHY am I getting 400V on 'pin 5' ?

L


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Old 30th April 2008, 10:25 PM   #4
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Quote:
Turn the tube upside down so you are looking at the pins. Pin 1 is to the left of the space and it continues clockwise around to the last one. So pin 9 for example would be the right hand side of the space.
I hope you have that backwards or my amp is in danger. Pin 1 should be to the right of the gap (or key slot on octal) should it not?

mike
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Old 30th April 2008, 10:28 PM   #5
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it is, when you look at the BOTTOM. When you turn it over, it's on the LEFT.

Anyway. I fired her up and she lives!! Just a matter of shedding some ripple voltage now.

L
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Old 30th April 2008, 10:55 PM   #6
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Click the image to open in full size.


i hope john broskie doesn't mind me linking this off his page, anyway...

the pins are shown here as if you had the tube held upside down in your hand, with the pins sticking back up at you. This is then the same orientation when you would look into the upturned amp with the rear of the socket facing you.


well, I'm always afraid of saying something totally stupid here... but my amps have worked so far! someone tell me I'm wrong before the 1/2 hr limit on edits is up!!

Fran
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Old 1st May 2008, 02:10 AM   #7
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Hi Fran

You are absolutely right!

Erik
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Old 1st May 2008, 07:54 AM   #8
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yup, he is! I just had one of those women-parking moments where right became left
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Old 2nd May 2008, 02:03 PM   #9
Milen is offline Milen  Bulgaria
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Just look at the heater pins, they are 4th and 5th
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Old 2nd May 2008, 03:31 PM   #10
kvk is offline kvk  United States
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Quote:
Originally posted by woodturner-fran
Click the image to open in full size.


When in doubt, measure. Assuming the heater pins aren't symmetric, just put an ohm meter where you think they are, 4&5 in the image. If you get infinite R, you got the wrong pins.
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