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Old 16th October 2007, 09:27 AM   #1
kelwin is offline kelwin  South Africa
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Join Date: Oct 2007
Default Xtant 3150c

Hi guys

Anyone worked with a 3150c before?

I bought one recently. Looks brand new. Stiil has the plastic seal on the cover etc.

Powers up, but I do not get any signal out. The noise gate selector switch is on bypass.

I have tried it with the Balanced line module as well, but do not get anything out from the speaker terminals.

I have the instruction manual, but it is not much help.

I can attach pics if required.

Thanks
Kelwin
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Old 17th October 2007, 04:40 AM   #2
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Join Date: Dec 2005
Location: Northern California
I have seen this problem a few times. It has something to do with the front end input. I have not teched the issue out but I do remember getting signals out of the amp if the input IC's section was bypassed by sending signal directly to the input diff pair of each channel.

I recommend testing the power supply feeds to these IC's and try bypassing the balanced input section by swapping the jumpers. Also make sure all the input vertical boards have jumpers installed when there are no boards installed in them.

Xtant is now owned by Mitec MTX. I have not heard anything positive about them offering any support for these early model Xtant amps. Good luck...
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Old 17th October 2007, 09:14 AM   #3
kelwin is offline kelwin  South Africa
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Default Service Manuals

Does anyone have a service manual/circuit diagram for the C series Xtant amplifiers?
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Old 23rd October 2007, 07:50 PM   #4
kelwin is offline kelwin  South Africa
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Default Sorted

Thanks the problem was with the input stage.

The power supply uses zeners to reduce the voltage to the op-amps. One of these was open circuit which meant incorrect supply to the opamps.
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Old 23rd October 2007, 09:58 PM   #5
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Location: Northern California
Cool glad it worked out for you. The supply issue was been seen before, glad it was easy for you..
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