Burned board

The amp is marked wrong for proper use by real people.

Some amps will mark the DC input as Test input and the AC input as the Normal input. This is how the Sony TA-3200F amp is marked for the switch that puts a capacitor in the circuit for the normal position. The cap selected provides 6dB/octave attenuation from 30Hz down, so at 15Hz it would be down that 6dB and 12dB down at 7.5Hz. This they say to prevent inaudible woofer movement at these lowest frequencies.

Marking the inputs as on that amp is just nuts because AC and DC are standard indications of an electrical supply.
 
If you watch the video the owner connected to the DC inputs, but I dont think he damaged
So I have a regula preamp, always connected to the ac inputs ?
 
If your preamp will never deliver any DC and you use a very low frequency filter to prevent the vinyl playback system from sending the lowest frequencies, record warp, tonearm resonance and such through the preamp to the amp then you can use the DC input. Difference shouldn’t be heard but might be seen with the woofer fluttering which isn’t audible due to the low frequency of the visible woofer movement.
 
Yeah, when they called that a power amplifier they meant exactly that. I have had two of them. They sound fantastic. I was always scared to death of them. No protection circuit, no DC block on the outputs at all. The soft start (lol) is a big huge almost automotive ( may well be automotive) relay. The solid copper rails are magnificent. Good luck finding parts to re populate to main board/s.
 
I talked to my tech, he said it should be fine.
Plan B, maybe using the chassis to install another amp inside, which diy amp would fit there ?
 
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