Xtant 3150c

kelwin · 16th October 2007, 09:27 AM

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

1moreamp · 17th October 2007, 04:40 AM

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...

kelwin · 17th October 2007, 09:14 AM

Does anyone have a service manual/circuit diagram for the C series Xtant amplifiers?

kelwin · 23rd October 2007, 07:50 PM

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.

1moreamp · 23rd October 2007, 09:58 PM

Cool glad it worked out for you. The supply issue was been seen before, glad it was easy for you..

16th October 2007, 09:27 AM	#1
kelwin diyAudio Member Join Date: Oct 2007	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

17th October 2007, 09:14 AM	#3
kelwin diyAudio Member Join Date: Oct 2007	Service Manuals Does anyone have a service manual/circuit diagram for the C series Xtant amplifiers?

23rd October 2007, 07:50 PM	#4
kelwin diyAudio Member Join Date: Oct 2007	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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17th October 2007, 04:40 AM	#2
1moreamp diyAudio Member 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...

23rd October 2007, 09:58 PM	#5
1moreamp diyAudio Member Join Date: Dec 2005 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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