Seller is legit but parts are not. I won't name names. Parts look good on curve tracer but I missed a telltale: DC gain (beta) is across the board (20 devices) double NEC data sheet spec.
I installed them in Phase 700 and they all blew at once when output hit about 50 Watts,
Post mortem dissection shows why (see photo): Original 2SD555 die is almost 50 sq cm. These "new" parts have a die that is only about 6 sq cm.
From now on, its ON Semi for parts. No more roll the dice trying for vintage devices.
I installed them in Phase 700 and they all blew at once when output hit about 50 Watts,
Post mortem dissection shows why (see photo): Original 2SD555 die is almost 50 sq cm. These "new" parts have a die that is only about 6 sq cm.
From now on, its ON Semi for parts. No more roll the dice trying for vintage devices.
