Bloody pinouts!

Psychobiker · 30th April 2008, 07:22 PM

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

woodturner-fran · 30th April 2008, 07:27 PM

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

Psychobiker · 30th April 2008, 07:36 PM

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

mashaffer · 30th April 2008, 09:25 PM

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

Psychobiker · 30th April 2008, 09:28 PM

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

woodturner-fran · 30th April 2008, 09:55 PM

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

ErikdeBest · 1st May 2008, 01:10 AM

Hi Fran

You are absolutely right!

Erik

Psychobiker · 1st May 2008, 06:54 AM

yup, he is! I just had one of those women-parking moments where right became left

Milen · 2nd May 2008, 01:03 PM

Just look at the heater pins, they are 4th and 5th

kvk · 2nd May 2008, 02:31 PM

Quote:

Originally posted by woodturner-fran

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.

30th April 2008, 07:22 PM	#1
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	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

1st May 2008, 01:10 AM	#7
ErikdeBest mostly thinkerer diyAudio Member Join Date: Mar 2003 Location: Maputo - Mozambique	Hi Fran You are absolutely right! Erik __________________ my surname is indeed 'de Best': neither misspelling nor snobbism! Ask SY!

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30th April 2008, 07:27 PM	#2
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	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

30th April 2008, 07:36 PM	#3
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	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

30th April 2008, 09:28 PM	#5
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	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

30th April 2008, 09:55 PM	#6
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	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

1st May 2008, 06:54 AM	#8
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	yup, he is! I just had one of those women-parking moments where right became left

2nd May 2008, 01:03 PM	#9
Milen diyAudio Member Join Date: Apr 2007 Location: Sofia	Just look at the heater pins, they are 4th and 5th