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had similar experience before.I feel like the ROHM parts are prone to blow up when the inrush current is too much and it's not my first time. Recently I built a BH earlier with accidentally installed one wrong resistor on one channel causing it drawing too much current,showing -V is constantly pulled low. at first I thought maybe the neg rail is oscillating (I was using Microchip SiC on this build) so I swapped back to ROHM SiC thinking that should work fine since I use it alot when the time that Cree part is constantly out of stock.then it blew up as HV kicked-in and almost shot my face :( .pics related https://imgur.com/z5IHdpx I fixed the issue after doing a full check on both amp, psu side and swapped the blown / incorrect parts . as i said , it's not my first time had the ROHM parts blown, although the root causes are different but they did easier to blow up when something is wrong. -
I, for one, welcome whatever input you have Doug. None of my sense of self is tied up in my appreciation for those speakers. I think part of the appeal is the dovetails, and that's more your area of expertise than mine., -
The Blue Hawaii lives! Got my shipment of Cree C2M1000's and replaced the 4 parts that appeared bad. Turns out the BC557B was not bad. I had just tested it incorrectly. So just the c2m1000, the 24V diode, and the 2N3904. My guess is that the alternate part I used for the C2m1000 was not quite up to the task and the inrush current of the startup finally killed it. I will probably replace the positive PSU's chip as well since I got 5 of the C2M1000's for future repairs as needed. I had not adjusted the balance of the amp since I first built it, and decided to check the voltages. After 30 minutes warm up, balance and offset are still +/- 1V. Impressive given the number of hours I have put on that amp over the past 3 years. -
I started responding and thought better of it. I don't find commercial audio gear very interesting, but I don't need to rain on anyone else's parade. -
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