Need help

2KW · 28th May 2007, 03:14 PM

Hi all,

I need some help in changing some values in a tone control circuit. I've tried contacting the author, but with no luck. I wish to use the circuit in a stereo preamp but cannot get 500k dual lin pots. so wish to substitute 100k pots. What specific value changes do I need to make to allow this.

The circuit can be found here: http://www.dogstar.dantimax.dk/tubes...s/toneampm.gif

Thanks.

richwalters · 28th May 2007, 05:51 PM

500K dual inline pots........oh yes you can. Try www.Mouser.com
part/stock numbers eg, 313-1250-500k
or my favourite 31VW505.

If you changed to 100K the loading may upset and create more thd.

Hope this helps

richj

Geek · 28th May 2007, 07:55 PM

Hi,

Quote:

Originally posted by 2KW
I've tried contacting the author, but with no luck.

Fred is RIP

Quote:

I wish to use the circuit in a stereo preamp but cannot get 500k dual lin pots. so wish to substitute 100k pots. What specific value changes do I need to make to allow this.

In the tone circuit? You can also try 1M. Then halve the cap values.

Cheers!

2KW · 29th May 2007, 01:15 PM

Fred is RIP ?

Sorry to hear that.

I have ordered some from Mouser. Thanks Rich. And thanks Geek.

Paul.

28th May 2007, 03:14 PM	#1
2KW diyAudio Member Join Date: Jan 2007	Need help Hi all, I need some help in changing some values in a tone control circuit. I've tried contacting the author, but with no luck. I wish to use the circuit in a stereo preamp but cannot get 500k dual lin pots. so wish to substitute 100k pots. What specific value changes do I need to make to allow this. The circuit can be found here: http://www.dogstar.dantimax.dk/tubes...s/toneampm.gif Thanks.

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28th May 2007, 05:51 PM	#2
richwalters diyAudio Member Join Date: Sep 2003 Location: Alps:Tube amp designs over 150W, SMPS guru.	500K dual inline pots........oh yes you can. Try www.Mouser.com part/stock numbers eg, 313-1250-500k or my favourite 31VW505. If you changed to 100K the loading may upset and create more thd. Hope this helps richj

29th May 2007, 01:15 PM	#4
2KW diyAudio Member Join Date: Jan 2007	Fred is RIP ? Sorry to hear that. I have ordered some from Mouser. Thanks Rich. And thanks Geek. Paul.

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