Steinhart TR-80 mystery IC

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ludo

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I'm trying to figure out what the chipamp in the Steinhart TR-80 amplifier is. It appears to be one of the Sanyo STK ICs that were popular in mini-hifis in the 90s, but the number has been sanded off. It has 16 pins, with + inputs on pins on 1 & 16, like the older types (ie STK4152II etc, but those have 18 pins... :-\) Newer 16 pin types have all the input pins on one side of the row, so won't work on this PCB. I'm not finding any Sanyo data for anything that will fit here.

Pin numbering/function is

1 +In1
2 -In1
3 Gnd/(Mute(?)
4 Bootstrap R 1
5 V-
6 Out1
7 Out1
8 Soft start(?)/Mute(?)/V+ filter for driving circuit(?)
9 V+
10 Out2
11 Out2
12 V-
13 Bootstrap R 2
14 Gnd/Mute(?)
15 -In2
16 +In2

Body of the package measures 78mm x 44mm and supply here is +/-33V

PCB is labeled TVP 4021G and Steinhart Elec- so I presume it is original and they were all like this.

Anybody have any idea what this IC is before I make a new board and fit some different rubbish in stead?

 
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