q2audio
Well-known member
Bobby,
Most of the 525's I have seen have been converted to the "550" pinout to work in lunchboxes. This would explain why your inputs are on different pins than a stock 525. Other pins are changed as well. I think that the units are modified at the PCB level to make them mono only (you can no longer make them stereo/mono at the connector).
The VCR2N is available from Electronics Goldmine:
http://www.goldmine-elec-products.com/searchprods.asp
Another lunchbox 550 weirdness: some 550's have a 39K resistor added from a pin on the rear of the unit to one of the op amp inputs. This was to increase gain of the 550 in certain consoles or applications (it may have gone to a switch?). The pin that was used on the rear turns out to be the same pin that supplies +48 in a lunchbox. If you plug in one of these modified 550's it will not pass signal until the resistor is removed, but it does not appear to cause damage.
Tim
Most of the 525's I have seen have been converted to the "550" pinout to work in lunchboxes. This would explain why your inputs are on different pins than a stock 525. Other pins are changed as well. I think that the units are modified at the PCB level to make them mono only (you can no longer make them stereo/mono at the connector).
The VCR2N is available from Electronics Goldmine:
http://www.goldmine-elec-products.com/searchprods.asp
Another lunchbox 550 weirdness: some 550's have a 39K resistor added from a pin on the rear of the unit to one of the op amp inputs. This was to increase gain of the 550 in certain consoles or applications (it may have gone to a switch?). The pin that was used on the rear turns out to be the same pin that supplies +48 in a lunchbox. If you plug in one of these modified 550's it will not pass signal until the resistor is removed, but it does not appear to cause damage.
Tim