Heater Pots?

agithegreat · 08:17 PM

What's the idea behind having a 500k pot in between pins 4/5 of my 6n1's to gnd?

I've just dismantled my mini meng (6n1 and 6p1) to point to point it instead, but I couldn't see the point of them being there??

The 500r trim in the bottom right:

Anyone shed any light?

llwhtt · 7th August 2010, 08:20 PM

The heater supply has no center tap, that means lots o' hum, so the pot creates one. It's a 500 Ohm not 500K. Adjust it for minimum hum from the speaker.

Craig

agithegreat · 7th August 2010, 08:28 PM

i even put 500r the second time around.

Thanks a lot for that, i'll make sure they go back in then.

7th August 2010, 08:03 PM	#1
agithegreat diyAudio Member Join Date: Jun 2008	Heater Pots? What's the idea behind having a 500k pot in between pins 4/5 of my 6n1's to gnd? I've just dismantled my mini meng (6n1 and 6p1) to point to point it instead, but I couldn't see the point of them being there?? The 500r trim in the bottom right: Anyone shed any light? Last edited by agithegreat; 7th August 2010 at 08:17 PM.

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7th August 2010, 08:20 PM	#2
llwhtt diyAudio Member Join Date: Jun 2008	The heater supply has no center tap, that means lots o' hum, so the pot creates one. It's a 500 Ohm not 500K. Adjust it for minimum hum from the speaker. Craig

7th August 2010, 08:28 PM	#3
agithegreat diyAudio Member Join Date: Jun 2008	i even put 500r the second time around. Thanks a lot for that, i'll make sure they go back in then.

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