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IS350xtrm
Active member
Got this in non working condition about a year ago. Decided to "fix" it a while back. Found a very crappy solder job on a replaced bass pot and a treble pot that was bleeding to ground as it was turned up. Replaced both and it sounded pretty darn good to my surprise. Found that they are actually built pretty darned well. Thick board, thick traces, decent iron, 1W resistors throughout, decently built power supply and filtering, a decent preamp path (yeah there's some ceramic caps, but they don't don't seem to hurt the tone too much), and it's incredibly easy to pull apart and service. I figured why not play with it a little, do some of the common mods and clean up and modernize the look a little. To that end, I did the following:
- Added a toggle to the front panel that works in parallel with a footswitch to change channels
- Full SLO 100 conversion other than a couple of caps in the power supply (I may do them later, but the amp sounds great as is)
- Changed the voltage divider resitors from the SLO spec 470k to 620K after the first stage to clean up and reduce the gain through the preamp a bit (still has a crap ton of gain)
- Replaced the slope resistor (47k) with a 50K rheostat in parallel with 32k in resistance as a midsweep so it can go from super tight to edge of doom level thickness
- Added the depth mod
- Replaced all of the pots with panel mounts which are wired to the board with flying leads to improve reliability (this makes working on the amp and replacing pots super easy)
- Cleaned up the stock headshell and made a custom front faceplate (be gentle, I was doing this with stuff I had laying around, I think it looks decent)
- Replaced the feet with 2" low profile pucks for better stability when sitting on wire or slatted shelving
- This model already had the power supply choke and omitted input cap, so no need to do those two items
-New JJ ECC83 preamp tubes and JJ 6L6GC power tubes
Might be other miscellaneous stuff, if you have any questions, feel free to ask.
I don't care if it sells because it sounds really good, but it got me in the mood to build another amp and the cash would be nice for parts... lol
Asking $700 but offers considered. I'm in Wisconsin.
- Added a toggle to the front panel that works in parallel with a footswitch to change channels
- Full SLO 100 conversion other than a couple of caps in the power supply (I may do them later, but the amp sounds great as is)
- Changed the voltage divider resitors from the SLO spec 470k to 620K after the first stage to clean up and reduce the gain through the preamp a bit (still has a crap ton of gain)
- Replaced the slope resistor (47k) with a 50K rheostat in parallel with 32k in resistance as a midsweep so it can go from super tight to edge of doom level thickness
- Added the depth mod
- Replaced all of the pots with panel mounts which are wired to the board with flying leads to improve reliability (this makes working on the amp and replacing pots super easy)
- Cleaned up the stock headshell and made a custom front faceplate (be gentle, I was doing this with stuff I had laying around, I think it looks decent)
- Replaced the feet with 2" low profile pucks for better stability when sitting on wire or slatted shelving
- This model already had the power supply choke and omitted input cap, so no need to do those two items
-New JJ ECC83 preamp tubes and JJ 6L6GC power tubes
Might be other miscellaneous stuff, if you have any questions, feel free to ask.
I don't care if it sells because it sounds really good, but it got me in the mood to build another amp and the cash would be nice for parts... lol
Asking $700 but offers considered. I'm in Wisconsin.
