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Old 24th September 2017, 10:30 PM   #1
HarryY is offline HarryY  United States
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TU-8500 Mod - Convert the Phono In Position to Line4 In
Default TU-8500 Mod - Convert the Phono In Position to Line4 In

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.

-----------------------------------------------------------------------
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
Attached Images
File Type: jpg Elekit TU-8500 Mod Photo.jpg (166.8 KB, 36 views)
File Type: jpg Elekit TU-8500 Mod Side A.jpg (114.8 KB, 35 views)

Last edited by HarryY; 28th September 2017 at 10:38 PM.
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