Cable length depends entirely on your set up, but typically 3 and 6 foot lengths are common and should be fine. I would start to worry if cables longer than 12' or so are required with a passive.
Just try it and see - you will quickly find out what does and doesn't work, and at some point trying several may help you to determine what you prefer.
Just try it and see - you will quickly find out what does and doesn't work, and at some point trying several may help you to determine what you prefer.
gingertube said:
Ian,
That's interesting. I was aware of the technique of using a resistor to make a linear pot more suitable for audio but it's interesting to see the function plotted.
I began to wonder why my attenuator has performed so well. My claim that it is a 250K is off. It measures out to 88K. Must be the Mad Cow, I'm sure I ordered a 250K - I even found the packing list. Sometimes better lucky than good.
But I'm still curious how low a value can be used before it starts to become a problem for the sourse. Obviously, to little impedance will exceed the current (power) of the sourse.
Dave
Captn Dave said:
The source impedance of your 250K pot as reflected to the stage it is driving is maximized at the -6dB point and is ~62.5K. -6dB is equal to two 125K resistors in series and when you work out the thevenin equivalent source impedance it is the resistance of two resistors in parallel or equivalent to 62.5K in series with your voltage source, read up on thevenin for more insight into how this works here: http://en.wikipedia.org/wiki/Thévenin's_theorem
Of course it might be an 100K or even an 88K pot if you measured across the ends with effectively nothing else connected to any terminal.
ok i need some more help i used a 10k alps pot for the volume control but when i turn the knob up it is no sound to high voilume and the as i turn it up the volume goes to left speaker then to the right and depending on the spot i have the knob i some times have less volume on one speaker any ideas on what i can do my set up is this 1 turn table 2 bugal preamp 3 alps 10k pot then to the dynaco st-70
Sure this pot is not bad? How about a diagram and picture showing how you have hooked things up?
Sounds like you have not wired it up correctly. Picture or diagram of what you have done would be helpful. Have you put the pot on the output of the preamp or the input of the ST70?
I dont get it. put a 50k stepped attenuator in a box like pam1 dynaco had for the amp. is that way too logical and works perfectly? of course dynaco used a pot. but you remove the pam 1 and just use their volume box and viola...no phono but perfect for line in. why have all this apperatus for a dynaco? add a phono for it if desired. the signal needs to be mutilated and money spent? why?
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