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Here is the IPA-140 with the cover over its twin power toroids and only partially exposed PSU board removed. The oval opening in the upper board shows an axle link of the volume control's shaft. The open section between phono boards accepts the optional USB module.

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Here is a closeup of one transformer from NOR-SE of Italy's Cremona region...


... followed by another view of the main board with its two box covers and dual-mono piggybacking phono modules...


... followed by a shot of one channel's transistor alley.



Here we see two International Rectifier 20A/200V n-channel power Mosfets.


This is a top view of what's beneath the cover of one channel.



Here is a closer view of one phono module followed by...


... what's beneath it. Note various jumper pin locations with their bridges removed.


Here is a socketed Burr Brown operational amplifier and open jumper junction.



Here we see a phono board from the top with its dual Burr Brown socketed op amps and the 'mouse piano' of adjustable resistive loading...



... and the switchable resistor bank in closeup....


... followed by two Chinese relays.