I would like to hear from anyone who has replaced the ThermalTrak transistors recently. My tech tells me that replacement parts are entirely compatible with the original amp design:
But I heard a second-hand account from a Mcintosh tech that they had several amps fail because there was indeed a difference between the leaded and non-leaded devices.
So is there more to this story than just the part numbers? It would help to have validation from someone who had repaired an SD135 recently.
Thanks...
The type # changed slightly, from NJL3281D & NJL1302D to NJL3281DG & NJL1302DG, to signify lead free. This simply means the solder used to "pre-tin" the device pins is no longer lead/tin blend. There was NO other change to device.
But I heard a second-hand account from a Mcintosh tech that they had several amps fail because there was indeed a difference between the leaded and non-leaded devices.
So is there more to this story than just the part numbers? It would help to have validation from someone who had repaired an SD135 recently.
Thanks...