11/25/2023 0 Comments Soundstream 405sWhat about using slightly higher rated, say 0.68ohm emitter resistors? Would that increase stability at all? I know the Class A amps run 1.0ohm + bypass diodes. It would be nice to lower rail voltage to about 45vDC in high power mode. Not sure if this is the right thing to do. I needed the schematic because some components were burned up and the original MOSFETS for the power supply were previously replaced. The original reference car audio amplifier, unbeaten for SQ, the circuit design and layout is a work of art.The Darlington output devices are configured in pairs to create that distinctive Soundstream tube like sound. It is pretty much a straight forward repair, outputs shorted, ect. I had done something similar in a test amp prior - playing with rail voltage as an experiment. Soundstream Reference 405 mint condition in original box for sale. If I increase R102 or R104 in the PS circuit a few K ohms will that reduce rail a bit? SOA seems kind of tight with TIP102 at 49vDC otherwise. Come to think of it, 49vDC is the highest rail voltage I've ever seen in a soundstream reference amp. Thats just shy of the 50v rail caps, and the TIP102/107 are only rated for 100v. Speaker over-current protection relays (on the. A fail-safe thermal protection circuit activating at 95OC. The sub channel to my surprise is running +-49vDC rail. PROTECTION CIRCUITS Your REFERENCE405 amplifier is protected against both overheating and short circuits by means of the following circuits: Main power supply fuses (2 at 20 amps each) Smart Power Supply Thermal Rollback activating at 85OC. Asking a lot from this amp with those dubs IMO those subs are looking for about 1000w whereas this amp can only give about ~300w. The customer was running it at 1.5 ohms under High Power mode, with two JL13tw3-3 subwoofers in a sealed box. Amp is working again and I've tested it down to 1.5ohm in high power mode. Also put in a brand NEW FED1 driver card this time, and two new Rectifiers for the 5th channel. Returned to me, and I found the entire 5th channel blown. The amp passed all tests and I sent it off to a customer.Ībout two weeks go by and customer says amp is blowing fuses. Soundstream 604 Reference Old School Legendary 4 Channel SQ Amplifier Nice Pre-Owned. Replaced all TIP102, TIP107, MPSA14, and 0.27ohm emitter resistors. Checked driver cards, rebuilt the sub driver card. Prior to the return, I rebuilt 3 of the 5 channels. This amp came back after I rebuilt it and the sub channel failed.
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