ST-70 Shunt regulator issue

K&K Audio / Lundahl Transformers

Welcome! Need support, you got it. Or share youe ideas and experiences.

I have a ST-70 with the K&K upgrade board (V1) and the shunt regulator upgrade.

In a fit of stupidity, I accidentally reversed the regulated voltage and b+ when reassembling my amp in a new chassis. Some or all of the transistors did not survive.

With all tubes pulled, I'm measuring a dead short between Reg V and GND and 83 ohms between B+ and ground. The short makes me fairly certain the IRF840 is toast, but it seems likely that other things died as well. The 83ohm reading is suggests source-drain shorts on both the IXYS fets as well.

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Should I just go ahead and replace all the transistors in the shunt regulator? Is there any chance I damaged any other components (like the current source fets?)

Sean

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Kimber Kable

Topic - ST-70 Shunt regulator issue - seanzozo 00:05:59 09/05/15 (1)

RE: ST-70 Shunt regulator issue - JKT 13:31:31 09/10/15 (0)

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