Home Theater bypass for a tube pre amp - Help!!!

andreasf · 28th September 2012, 05:07 AM

I recently purchased a tube pre amp and would like to install a HT bypass. I got the Elma selector switch and would like to use the existing pre amp output.
How would I go about wiring in the bypass without interfering with the pre amp circuit. I tried just straight wiring but there seems to be interference with the circuit - feedback.
Any ideas, guidance from knowledgeable diy'ers

Thanks and cheers

Bigun · 6th October 2012, 11:38 PM

You need to make sure that if you are just connecting the input to the output with a bypass switch that you have the pre-amp powered OFF or you are creating a positive feedback loop.

andreasf · 11th October 2012, 04:15 AM

Thanks for the info. Is there a other way to accomplish this without having to turn off the pre amp?

28th September 2012, 05:07 AM	#1
andreasf diyAudio Member Join Date: Jan 2012	Home Theater bypass for a tube pre amp - Help!!! I recently purchased a tube pre amp and would like to install a HT bypass. I got the Elma selector switch and would like to use the existing pre amp output. How would I go about wiring in the bypass without interfering with the pre amp circuit. I tried just straight wiring but there seems to be interference with the circuit - feedback. Any ideas, guidance from knowledgeable diy'ers Thanks and cheers

6th October 2012, 11:38 PM	#2
Bigun diyAudio Member Join Date: Jan 2009 Location: Waterloo, ON or Herefordshire UK	You need to make sure that if you are just connecting the input to the output with a bypass switch that you have the pre-amp powered OFF or you are creating a positive feedback loop. __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

11th October 2012, 04:15 AM	#3
andreasf diyAudio Member Join Date: Jan 2012	Thanks Bigun Thanks for the info. Is there a other way to accomplish this without having to turn off the pre amp?

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