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Re: What is happening???

No, you're right, I've heard "bypass" used for the decoupling caps too. What you're using is fine. It's unlikely to be a power supply or OPT problem--the 125ese shouldn't have any problem here.

I think it's an acoustic feedback thing between the amp and the K-horns. As I said, it's a pretty high-gain circuit, and when you drop the voltage to 750 you are also decreasing the drive requirements for the 845. What preamp are you using? Try a 6J5 in place of the 6N7 or rewire the breadboard to acoomodate a 6SN7.

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  Michael Percy Audio  

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