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In Reply to: RE: Let me rephrase this attenuator question posted by Lew on February 04, 2016 at 07:29:51
Right now I am using a Radioshack 1/4 watt metal film 10k resistor. Pretty transparent and not a bad little resistor!
When i up the value of the line resistor it does have a positive effect on making the shunt have smaller db increments. Lower the value and the db increments get too narrow for the volume control to be of any good use - ie, twitchy.
All in all it does work quite well. Like I said I use it for a narrow volume range and it does fit my needs. Now I should use the best most transparent resistor I can find.
I was looking at the Vishay lines but which one would be best?
charles
Follow Ups:
This one is the most transparent IME. Available direct from manufacturer and also several vendors:
For the series resistor, I use Vishay nude TX2575. They can be purchased on-line for ~$10 each. For the shunt resistors, I use a Khozmo shunt attenuator with Dale-Vishay resistors, the little beige/brown colored ones. Caddock TF020 (from M Percy) are also very transparent as are the "other" nude Vishays sold by MP, TX23-something-something. This, of course, is my opinion. However, it's backed up by very low noise measurements for these resistors. IMO, a TX2575 will blow away anything you could have bought at Radio Shack.If, as someone else inferred, you have two different attenuators in the signal path, one built in and one used as a remote, by all means do cut back to one in-line attenuator. That alone should help.
Edits: 02/04/16
And it has a remote version
THANKS!!!!!!!
charles
I searched a long time for something like the Khozmo, so I would not have to build a shunt attenuator myself. It's nice quality and has given me no problem; I use the manual version, no remote. I have seen some complaints about the company on the web, for long delivery times and at least one about quality of the switch, but in my case, the lead time was short and the quality is obvious. I use their stereo shunt attenuator in a balanced circuit.
I'm going to go for the Shunt version with remote.
I am assuming the shunt version uses only two resistors in any position?
thanks
charles
Correct. I use the nude Vishay TX in series and the Khozmo to ground. It places one Dale-Vishay at a time between hot and ground. The wiring instructions are pretty clear. For balanced, I had to do some thinking and got some advice from TubeDIY.
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