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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

shunt type attenuator
shunt type attenuator
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Old 9th February 2018, 10:53 AM   #11
merlin el mago is offline merlin el mago
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Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by nashbap View Post
I have used the KOA Speer in the shunt position and TX2575 as you plan and found the combo harsh. Switched to Takman metal film and found an improvement. Switched the TX to Shinkoh 1 watt for the series and it sounds wonderful. All this for classical music.

nash
Same experience here using Shallco switch.

Felipe
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Old 9th February 2018, 10:54 AM   #12
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by DF96 View Post
The popularity of shunt attenuators is a good sign that electricity is poorly taught in school science lessons.

Resistors are the second most perfect/ideal components used in electronics. (The first most perfect components are wires.) Why get worked up about near perfection when much worse problems come from nasty things like transistors and valves?

Anyway, someone who is worried about resistors and knows anything about resistors would use the same resistor technology for the shunt and series elements. This will minimise errors. Ideally, use the same value too - but this makes changing the volume rather difficult unless you use strings of resistors. It makes absolutely no sense whatsoever to use an expensve resistor for the series element and something different for the shunt element.
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Old 9th February 2018, 10:56 AM   #13
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by glennjarrett View Post
looking to make a shunt type attenuator 23 step 10k
will be using Z foils for the 2x input/output resistors 10K
what effect has the resistors that go to ground have on the sound if any ?
goldpoint website says that the ROA Speer mouser stock are the best through hole they have tried and for pennies ( pity mouser charge so much for posting a few bits ) cant seem to find them anywhere else

Click the image to open in full size.shunt by glenn jarrett, on Flickr
If possible use ladder type attenuator because maintain the input impedance constant.
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