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Old 17th September 2005, 11:29 PM   #1
roger-k is offline roger-k  Norway
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Default 100 ohm pot for preamp?

I will make this preamp:
http://www.tcaas.btinternet.co.uk/jlhmodpre.htm

It is hard for me to get the 100 ohm pot for the balance-controll.
Any who know about a place where I can buy 100ohm pot which is panel mounted?

Or can I solve this in an other way?
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Old 18th September 2005, 01:33 AM   #2
anatech is offline anatech  Canada
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Interesting. I would have assumed 100K. At 100R, the coupling caps are a bit small. Are you sure it isn't a misprint?

-Chris
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Old 18th September 2005, 02:01 AM   #3
hughmon is offline hughmon  United States
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Any particular reason for using an inverting phono stage?? Or do you just plan to build from the line level on??
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Old 18th September 2005, 08:42 AM   #4
AndrewT is online now AndrewT  Scotland
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Hi,
I do not have the skills to confirm that 100r is correct or if it is a misprint.
However, try leaving that connection empty at first build and then insert a 100r resistor to ground and measure the amp gain. Then use a 50r (100//100) to measure the in balance gain and finally connect the cap to ground (equivalent to balance control way off to left) and again check gain.
If the 100r is correct the gain should go about +3db to -10db relative to the 50r measurement.
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Old 18th September 2005, 09:47 AM   #5
roger-k is offline roger-k  Norway
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Default 100ohm is correct, not misprint

It is 100 ohm. This is not a misprint.

"Fine balance between channels is obtained by adjusting the 100ohm balance potentiometer in the output stage"

This text is a copy from the intenet page:
http://www.tcaas.btinternet.co.uk/jlhmodpre.htm

Regards Roger
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Old 18th September 2005, 02:15 PM   #6
anatech is offline anatech  Canada
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There will be some frequency problems with that value then. As in, too much bass in the lowered channel. Oh well.

-Chris
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Old 18th September 2005, 04:27 PM   #7
moamps is offline moamps  Croatia
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Default Re: 100 ohm pot for preamp?

Quote:
Originally posted by roger-k
It is hard for me to get the 100 ohm pot for the balance-controll.
Any who know about a place where I can buy 100ohm pot which is panel mounted?

http://no.farnell.com/jsp/endecaSear...&Ntk=gensearch
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Old 19th September 2005, 09:51 AM   #8
roger-k is offline roger-k  Norway
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moamps:
Thanks for the reply. Now I have order the pots from farnell.

hughmon:
Yes, I will not make the phono stage.

Regards Roger
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