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Having 2 different preamps to turn on the same amp via 12v trigger

I have a an av pre for home theater and a 2 channel BHK pre for audio. The BHK is used in bypass while using home theater. 
My issue is they share the same amp and I’d like for the amp to trigger on with either pre. The amp doesn’t have line input sensing trigger. 
How can I trigger the amp with either pre ?  
So far I’ve only come up with make my own cable with diodes as to not backfeed to the pre that’s not in use. Wish I can find something off the shelf.  

dahodevil

Showing 3 responses by dahodevil

dahodevil OP
22 posts
 

I had a brain fart. I thought the BHK would be turned off in HT mode. It needs to be on. So that’s the only one that needs to trigger the amps on. DONE. 
thanks 

dahodevil OP
22 posts
 

Thank you. This should work. 

dahodevil OP
22 posts
 

Oh. I see. 
I will just use the theater bypass instead of adding something in the signal path. 
The BHK keeps the solid state section on in standby anyway and in HT bypass the tube section is disabled. 
Thank you for the information. This would work if I didn’t have another option. 
david 

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