Pot Impedance

We all start somewhere
User avatar
Cressy Snr
Amstrad Tower of Power
Posts: 10713
Joined: Wed May 30, 2007 12:25 am
Location: South Yorks.

#1 Pot Impedance

Unread post by Cressy Snr »

Just a quick question:
I have a high quality, Khozmo shunt stepped attenuator, that cost three figures when I bought it for use in a balanced passive preamp. I'd like to use it with the valve amp rebuild but it is only 10K. Is there any reason not to use it in front of the 6SL7 input stage of the valve amp? Is the traditional 100K pot there for a reason?
Sgt. Baker started talkin’ with a Bullhorn in his hand.
User avatar
Nick
Site Admin
Posts: 15979
Joined: Sun May 06, 2007 10:20 am
Location: West Yorkshire

#2 Re: Pot Impedance

Unread post by Nick »

No, the only reason for 100k is if its driven by other valve kit, that source may have a high output impedance so 100k would work better. No reason why 10k won't be just fine assuming your sources is happy with that.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
User avatar
Cressy Snr
Amstrad Tower of Power
Posts: 10713
Joined: Wed May 30, 2007 12:25 am
Location: South Yorks.

#3 Re: Pot Impedance

Unread post by Cressy Snr »

Thanks Nick.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
User avatar
Mike H
Amstrad Tower of Power
Posts: 20304
Joined: Sat Oct 04, 2008 5:38 pm
Location: The Fens
Contact:

#4 Re: Pot Impedance

Unread post by Mike H »

I concur with Nick.

I even use 100k pots on transistor amp front-ends (with large value bias resistors for the first stage) just in case the source clutches its pearl necklace and faints if presented with anything much lower
:lol:
 
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
Post Reply