|10th June 2018, 01:43 PM||#11|
Join Date: Jul 2005
Location: D-55629 Schwarzerden
For example - a rotary switch from Lorlin produces costs arround 1 US-$, while Shallco, ELMA or Seiden produces costs of 100 to 200 Lorlin switches for one unit. Similar situation are to observe at potentiometers (compare Piher, Alps and Penny/Giles)
The fact that differences in sound quality occur at these differences at costs, is actually self-evident (bad contact quality means bad sound).
That's why even commercial passive pre-amplifiers with only two rotary switches are extremely expensive - go to post #26 under
If there are additional long shielded wire between potentiometer output and gain stage signal input in use (e. g. to a pair of monaural power amplifiers), there are an unwanted parasitic low pass filter effect (dependend of the potentiometer position),which creates even lack dynamics on sound impression.
Therefore I am looking to a TVC approach for a passive preamp with gain factor below unity gain (between 0,2 and 0,6), but which is suitable for long shielded cables.
Who know such TVC's ?
Thank you for advices.
Last edited by tiefbassuebertr; 10th June 2018 at 01:54 PM.
|10th June 2018, 02:15 PM||#12|
Official Court Jester
buffer in front of AVC
no need for TVC, except if you want galvanic isolation
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