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Old 5th March 2013, 03:25 AM   #1
MGH is offline MGH  United States
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Default Most transparent/neutral switch

Hi, I am looking for a switch that will be able to toggle between two different brands of input resistors (connected to the grid of the 12AX7) of my amp. What is the most transparent, well built switch out there? Thanks.
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Old 5th March 2013, 08:53 AM   #2
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Old 5th March 2013, 11:11 AM   #3
DF96 is offline DF96  England
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Any switch will add stray capacitance and contact resistance, which is likely to swamp any changes due to resistor brands. In this situation the best switch is a soldering iron. Unless there is something seriously wrong with your circuit or some of the resistors you are very unlikely to actually hear any difference anyway.
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Old 5th March 2013, 11:17 AM   #4
SY is offline SY  United States
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If you're doing what I think you're doing, your number one issue will be a bone-rattling speaker-killing BANG!!! when you flip the switch.
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Old 6th March 2013, 03:21 AM   #5
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I'm trying to A/B resistors in my amp circuit without having to solder/desolder. Would make before break switch (ie, Elma rotary switch) be better option to prevent possible speaker damage? With the toggle, I was going to turn off the amp and then switch the resistor with toggle to prevent any damage. I've heard some good things about TOCOS and Alco toggle switches.
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Old 6th March 2013, 09:45 AM   #6
DF96 is offline DF96  England
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Read what I said about stray capacitance and contact resistance.

However, if you wish to proceed then make-before-break action will avoid the 'bang' problem. I would be interested to know how you will flip the switch without knowing which way you flipped it. Given that many switches have slightly different mechanical clicks at each position, getting someone else to do it while you are not looking might not work either. You were intending to do real tests with ears only, weren't you?
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Old 7th March 2013, 05:36 AM   #7
MGH is offline MGH  United States
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DF96, not sure what you're talking about. Were you thinking I was going to do a double blind listening test?
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Old 7th March 2013, 11:08 AM   #8
DF96 is offline DF96  England
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I was hoping you might make some effort to limit your tests to what can actually be heard only. This is difficult to do, so most people don't bother and end up believing their own myths.
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Old 9th March 2013, 05:12 AM   #9
MGH is offline MGH  United States
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I was planning to test if I can detect a difference in sound of my amp with and without the switch. If I can't tell the difference, then I would conclude it's a good switch and would proceed with installing different resistors to the switch. A double blind test would not be practical in this case.
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Old 9th March 2013, 10:15 AM   #10
DF96 is offline DF96  England
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I was thinking of the resistor test, not the switch test. The likely outcome is that with/without the switch will produce a measurable/explicable change in the system (from stray caapcitance etc.), but you might not hear any difference. Swapping resistors is likely to cause a much smaller change, but you may be more sure that you can hear a difference (provided that you know which resistor is which).
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