Tweed Audio C507A pinout question - Gearspace.com
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Tweed Audio C507A pinout question
Old 25th September 2012
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jackinthebox's Avatar
🎧 15 years
Tweed Audio C507A pinout question

Hi Guys,

I'm finally racking up some Tweed Audio C507A Preamp EQ modules which I've had lying around for ages.

I was kindly supplied with a Pinout list by [email protected] but i have a few questions regarding some of the information on the list.

Pins 23 and 24 are both Mic input cold. I am guessing this is a Typo as there doesn't seem to be a Mic input hot pin, i am going on the assumption that pin 24 should be mic input hot. Or am i missing something? Can you have a mic input with two cold connections???

My next question is regarding the Line inputs on 22 and 21, hot and cold. But where is the ground? Should i be using a common ground pin? like pin 1 or pin 25? I'm guessing not pin 15 as this is 0volts for the power supply.

I'm also slightly foxed by the power resistors from the 48volts phantom supply on pin 9. Would phantom power be supplied to both pin 23 and 24?

Any help would be greatly appreciated.

See below for the pinouts.

Tweed Mic/ Line module Connections.

Pin number Functional connection

1 Chassis Ground
2 Output balanced Cold ( - ).
3 Output balanced Hot ( + ).
4 No Connection (N/C).
5 N/C
6 N/C
7 Power 18 VDC Negative. ( - ).
8 N/C
9 Phantom power in 48VDC ( + ).
10 N/C
11 Unbalanced output (phase reversed from I/P.)
12 N/C
13 Lamp (+) DO NOT connect here!
14 N/C
15 Electronic ground. 0VDC.
16 N/C
17 Power 18 VDC Positive. ( + )
18 N/C
19 N/C
20 N/C
21 Line input. Cold ( - )
22 Line input. Hot ( + )
23 Mic input. Cold ( - )
24 Mic input. Cold ( - )
25 Mic shield ground.

Power draw per rail +/- 18Volt is approx 70mA.

Phantom power resistors (2) between pins 9 (common point) and 23/24:
For 48V Phantom = 6K8 ohms.
For 24V Phantom = 1K2 ohms.
For 12V Phantom = 680 ohms.
Attached Files
File Type: doc Tweed module connections.doc (21.0 KB, 153 views)
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