connections to replace balance pot

kifeinthesink · 23rd July 2010, 08:57 PM

I've pulled out the old balance pot on an old diy amp I acquired recently. I would like to replace it with wire/resistors but I'm not sure about the connections.

The left pin receives the signal from the volume pot, the centre goes to ground, and I'm not sure about the right pot.

When the pot is at the centre the resistance between Left/centre and right/centre is 425k on both sides. The resistance between left and right is constant at about 830k.

Do I need to connnect the left and right pins via a resistor or just the left to centre and right to centre? Do these need to be resistors or can it be wire?

Unfortunately I dont have a schematic and I'm not going to find one since I can't even identify this old kit so I'm limited to some guess work.

Any input would help.

Thanks

Xoc1 · 23rd July 2010, 09:51 PM

I would think that 2, off 470 ohm resistors connected between each end connection to earth would make a good substitute. Probably without these resistors you will find that the volume control will give a very high signal at low settings.

mjf · 23rd July 2010, 10:34 PM

QUOTE
Do I need to connnect the left and right pins via a resistor or just the left to centre and right to centre?

is it a tube amp or a transistor amp?

........try to leave out this pot perhaps it works
.......or build in res 470k just the left to centre and right to centre.
greetings

richie00boy · 23rd July 2010, 10:46 PM

470 ohm is too low. Looks like the balance pot is a 1meg pot. You need two resistors, one from each outer pin to the middle pin, each 430k. But personally I would just not put anything back and live with the increase in achieveable level.

Xoc1 · 23rd July 2010, 10:54 PM

Quote:

470 ohm is too low. Looks like the balance pot is a 1meg pot

Oops

Been a long day
Just substitute K for R......

kifeinthesink · 24th July 2010, 12:42 AM

Thanks all. I'll try it without a replacement for the pot first.

kifeinthesink · 24th July 2010, 12:43 AM

Mjf. It's a transistor amp.

kifeinthesink · 24th July 2010, 01:46 AM

Works great just removing the pot. Thanks.

23rd July 2010, 08:57 PM	#1
kifeinthesink diyAudio Member Join Date: Oct 2005 Location: Guelph, Ontario	connections to replace balance pot I've pulled out the old balance pot on an old diy amp I acquired recently. I would like to replace it with wire/resistors but I'm not sure about the connections. The left pin receives the signal from the volume pot, the centre goes to ground, and I'm not sure about the right pot. When the pot is at the centre the resistance between Left/centre and right/centre is 425k on both sides. The resistance between left and right is constant at about 830k. Do I need to connnect the left and right pins via a resistor or just the left to centre and right to centre? Do these need to be resistors or can it be wire? Unfortunately I dont have a schematic and I'm not going to find one since I can't even identify this old kit so I'm limited to some guess work. Any input would help. Thanks

23rd July 2010, 10:46 PM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	470 ohm is too low. Looks like the balance pot is a 1meg pot. You need two resistors, one from each outer pin to the middle pin, each 430k. But personally I would just not put anything back and live with the increase in achieveable level. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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23rd July 2010, 09:51 PM	#2
Xoc1 diyAudio Member Join Date: Nov 2008 Location: Devon UK	I would think that 2, off 470 ohm resistors connected between each end connection to earth would make a good substitute. Probably without these resistors you will find that the volume control will give a very high signal at low settings.

23rd July 2010, 10:34 PM	#3
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	QUOTE Do I need to connnect the left and right pins via a resistor or just the left to centre and right to centre? is it a tube amp or a transistor amp? ........try to leave out this pot perhaps it works .......or build in res 470k just the left to centre and right to centre. greetings

24th July 2010, 12:42 AM	#6
kifeinthesink diyAudio Member Join Date: Oct 2005 Location: Guelph, Ontario	Thanks all. I'll try it without a replacement for the pot first.

24th July 2010, 12:43 AM	#7
kifeinthesink diyAudio Member Join Date: Oct 2005 Location: Guelph, Ontario	Mjf. It's a transistor amp.

24th July 2010, 01:46 AM	#8
kifeinthesink diyAudio Member Join Date: Oct 2005 Location: Guelph, Ontario	Works great just removing the pot. Thanks.

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