On Tuesday, April 12, 2016 at 2:56:19 PM UTC-4, wrote:
On Tuesday, April 12, 2016 at 2:34:42 PM UTC-4, wrote:
I have an older QSC model 1400 in with some blown output transistors (uses 8 per channel). Original outputs are Toshiba 2SD424 and B554. QSC doesn't sell parts for this amp any longer because of it's age. Is there a reliable source of these outputs, or should I replace them all with something newer?

These are a common output transistor and are readily available. MCM electronics has them as does MAT Electronics and others. Look around. Dalbani out of Florida should have them as well. IRRC Dalbani is hte least expensive. That being said, these are usually $4-$6 each.

Dan

Yes, I see them all over the net. It's been years since I've done much audio but I remember the counterfeit invasion of Toshiba plastic transistors and just want to be sure the supply of these particular outputs is safe.