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Author Topic: API 325 line amp to mic pre mod?  (Read 1803 times)

Magnet

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API 325 line amp to mic pre mod?
« on: November 06, 2004, 09:58:04 PM »

Anybody know anything about modifying an API 325 line amp to a API 312 mic pre? How to do it and approx. how much will each channel cost to mod?

Thank you

magnet
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Bo Hansén

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Re: API 325 line amp to mic pre mod?
« Reply #1 on: November 07, 2004, 11:46:28 AM »

Hi Magnet,

I have some information about the API 312 and 325 amp cards for a other modification, but you can compare the schematics and se the different between the 312 and 325 cards on this link:

http://w1.316.telia.com/~u31617586/

--Bo
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Bo Hansén
Hansén Audio
Gothenburg, Sweden
http://www.hansenaudio.se

Geoff_T

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Re: API 325 line amp to mic pre mod?
« Reply #2 on: November 07, 2004, 03:17:31 PM »

Bo Hans
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Geoff Tanner
http://www.auroraaudio.net/main.shtml
http://www.grandmasterrecorders.com
    http://www.amazon.com/gp/reader/0595093329/ref=sib_dp_pt/104 -6861899-0350336#reader-link

NB Please do not pm me if you want a fast response... please email me.

Bo Hansén

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Re: API 325 line amp to mic pre mod?
« Reply #3 on: November 07, 2004, 09:20:06 PM »

Hi Geoff,

This R,C,D circuit from XLR pin 1 to the DI-box electronic ground and case are a alternative for a ground lift switch.
The circuit eliminate ground loops between the Di-box, monitor/back line guitar amp and the mixing console, the combination of this R,C,D components fill the demand for satisfactory function in ground loop disturbance as hum and buzz, negative phantom power feed and also give a safety ground that can blow a fuse if there are some mains voltage fault somewhere in the chain.

--Bo  
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Bo Hansén
Hansén Audio
Gothenburg, Sweden
http://www.hansenaudio.se
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