I held off buying the TU-8500 because while I wanted a
preamp I had no use for the phono section of the TU-8500.
Upon studying the circuit I realized I could easily convert
the Phono IN to a standard Input to act as a Line4 IN.
This is not an approved mod so proceed at your own risk.
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To convert the Phono In Position to a Line4 In
simply Omit the following components during the build:
C1 - C12, R1 - R26, SW1, IC1 & IC2 Including sockets.
Then Insert two jumpers to bypass the omitted section.
Left Channel - From Pin 3 of IC1 to R27 side of C11
Right Chanel - From Pin 5 of IC2 to R28 side of C12
-----------------------------------------------------------------------
If in the future you desire the phono section then simply
Remove the two jumpers and install the omitted components
-----------------------------------------------------------------------
See attached Photos for details
preamp I had no use for the phono section of the TU-8500.
Upon studying the circuit I realized I could easily convert
the Phono IN to a standard Input to act as a Line4 IN.
This is not an approved mod so proceed at your own risk.
-----------------------------------------------------------------------
To convert the Phono In Position to a Line4 In
simply Omit the following components during the build:
C1 - C12, R1 - R26, SW1, IC1 & IC2 Including sockets.
Then Insert two jumpers to bypass the omitted section.
Left Channel - From Pin 3 of IC1 to R27 side of C11
Right Chanel - From Pin 5 of IC2 to R28 side of C12
-----------------------------------------------------------------------
If in the future you desire the phono section then simply
Remove the two jumpers and install the omitted components
-----------------------------------------------------------------------
See attached Photos for details
Attachments
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