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Tube DIY Asylum: Re: Stepped attenuator with low profile for Fi Y pre? by Dave Cigna Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Stepped attenuator with low profile for Fi Y pre? posted by restock on January 11, 2006 at 17:25:53:
I don't like the idea of adding a lot of series resistance to get the signal level down, but you can minimize it if you use a much smaller pot too. For example, if your current pot is a 100k unit, then you could replace it with a 25k unit and put 75k fixed resistors 'on top' of the pot. This will let you use the pot up where the tracking is better.Unfortunately, the fixed resistors will probably add their own flavor to the sound (though you're probably used to this without knowing it if you've been running down around 7 - 9 o'clock'; the sound of the pot itself...) You might want to choose good resistors. I have no experience with expensive resistors, so I can't recommend any. Personally, I have always preferred wire wound, but it's hard to find them at that high value. (Gary's post on LED biasing had me shaking my head in agreement. :-)
As a quick fix you could try adding resistors of 2 or 3 times the pot value in series before the pot - just what Don recommended. At least that will let you run where the tracking is better.
-- Dave
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Topic - Stepped attenuator with low profile for Fi Y pre? - restock 17:25:53 01/11/06 ( 27)
- I trust you know two inputs have reduced gain for use with high output sources(nt) - Russ57 07:44:04 01/13/06 ( 1)
- Yep... - restock 10:30:36 01/13/06 ( 0)
Re: Stepped attenuator with low profile for Fi Y pre? - Dave Cigna 01/12/06 16:06:34 01/12/06 ( 1)
- Re: Stepped attenuator with low profile for Fi Y pre? - restock 10:43:34 01/13/06 ( 0)
So far two that should fit... - restock 12:52:01 01/12/06 ( 0)
You might try a law faked linear (Vishay/Sfernice cermet)(nt) - Russ57 12:14:16 01/12/06 ( 1)
- Completely agree with Russ - law faking - andy evans 14:30:55 01/12/06 ( 0)
Measuring the tracking differences... - restock 23:10:32 01/11/06 ( 5)
- Re: Measuring the tracking differences... - fatbottle 05:00:52 01/12/06 ( 4)
- To refresh yr memory... - cheap-Jack 07:36:11 01/12/06 ( 3)
- I must apologise for this , I'm being stalked by Cheap Jack.... - fatbottle 07:40:14 01/12/06 ( 2)
- Sorry, c-J stalked you, again ! - cheap-Jack 07:56:32 01/12/06 ( 1)
Re: Stepped attenuator with low profile for Fi Y pre? - dave slagle 18:28:40 01/11/06 ( 13)
- Re: Stepped attenuator with low profile for Fi Y pre? - restock 18:45:00 01/11/06 ( 12)
- Get to the root of the problem - too much gain. - cheap-Jack 09:18:17 01/12/06 ( 0)
- Re: Stepped attenuator with low profile for Fi Y pre? - dave slagle 19:09:59 01/11/06 ( 2)
- YES ! - cheap-Jack 07:47:33 01/12/06 ( 0)
- Re: Stepped attenuator with low profile for Fi Y pre? - restock 20:57:09 01/11/06 ( 0)
Re: Stepped attenuator with low profile for Fi Y pre? - GEO 19:00:43 01/11/06 ( 7)
- Re: Stepped attenuator with low profile for Fi Y pre? - restock 21:05:14 01/11/06 ( 3)
- Re: Stepped attenuator with low profile for Fi Y pre? - GEO 05:53:02 01/12/06 ( 2)
- Re: Stepped attenuator with low profile for Fi Y pre? - restock 08:25:49 01/12/06 ( 1)
- Re: Stepped attenuator with low profile for Fi Y pre? - kyle 12:58:07 01/12/06 ( 0)
Re: Stepped attenuator with low profile for Fi Y pre? - restock 21:02:26 01/11/06 ( 0)
Re: Stepped attenuator with low profile for Fi Y pre? - dave slagle 20:38:40 01/11/06 ( 1)
- Re: Stepped attenuator with low profile for Fi Y pre? - GEO 05:51:17 01/12/06 ( 0)