Re: Tapco Service Manuals And Operator Manuals

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Posted by Bob Gudgel ( on July 17, 2001 at 17:09:39:

In Reply to: Re: Tapco Service Manuals And Operator Manuals posted by Kit Kellison on July 11, 2001 at 08:04:35:

: I have a Tapco 6201B that I have just taken out of "mothballs" that I need some info on. My manual seems to be missing info from the "ON OFF Switch" to the end. What I have includes info on

I don't have a manual on this one but I bet Rick Chinn does.
Rick? The phantom power is the 48Volts (open cicuit) for the
powering of condensor microphones. This 48Volts is applied to
pins 2 and 3 of the 3 pin connector and the ground
is pin 1. Pin 2 is usually HOT with respect to pin
3 when balanced mode is used. So, the application of the + 48 Volts
does not (normally) have any effect on a non-powered microphone
like the SM-58. Yes, the SM-58 is balanced, but not powered
so the 48 Volts DC, (if turned on), would appear at
pins 2 and 3, (the SM-58 balanced lines), but since there is
no voltage differential from pin 2 to 3, there is no current
drawn by the microphone and therefore no effect or harm done to
the sound or microphone. The powered microphones will use this
48 Volts, (less when the mic is being powered because of the resistors
in the preamp of the mixer), from pin 2 and/or pin 3 to ground.
It's the reference to ground from pin 2 and 3 that makes the phantom
power work to power the microphone. Otherwise, pin 1 is just a ground
or shield for external fields.

: Channel Gain
: Bass and Treble
: Effects
: Monitors
: MIC/Line switch
: Some Additional inputs on inputs
: Input connections
: Master Gain contols
: Rumble Filter
: Effect Returns Funtional description
: Master Monitor
: Phantom Power ON/Off switch
: and the first part of ON/OFF

: Am I missing anything critical?
: Also, can anyone tell me if a Shure SM 58 is a "balanced Mic?" Also, I am not sure I understand the purpose of Phantom Power.

: I appreciate any info I can get.

: Kit Kellison

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