Bi-amp progress

I lost a channel off the Sansui again and in the middle  f troubleshooting that problem, discovered the Alesis equalizer had lost a channel.

I took the Alsis apart. The design and layout are simple.

I traced the problem to a micro break in a piece of copper etch run. The break was at a plate-through.
A plate-through is a hole in the pcb that has been lined with metal to connect both sides of the board electronically, at that given point.

I scraped the etch next to the plate-through and added some solder to bridge the gap. I'll test later. Now, I'm still troubleshooting the Sansui amplifier.

Once I repair the Sansui, or buy another Pioneer SX-255R, I'll insert the Alesis equalizer into the system and run a test. I used the equaizer on one channel before discovering the other chanel was off, and everything sounded good.

Currently, I'm still using the cheap Chinese diaphragms on my horns' comression drivers. I have one after market reproduction in storage, and will eventually order another, then install both.

The reproductions have different terminal connection devices which I will have to adapt. The originals use screws and fork lugs. The reproductions use blade connectors similar to what is usually found in automotive electronics.

I'm searching for an inexpensive measurement microphone to do acoustic measurements. No luck yet.
PayPal notified me the UMIK-1 seller who did not ship, refunded my money. I checked the seller site and the item was gone. My onsite account had been altered. No surprise. PayPal stepped in and probably convinced the seller to make the refund.

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