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Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => Amplifier Discussion => Topic started by: Jack1962 on July 13, 2008, 04:15:37 PM

Title: 6357B NPN Power Transistors
Post by: Jack1962 on July 13, 2008, 04:15:37 PM
What's Up

        I'm repairing a Peavey Stereo Chorus 400, 1 of the of power amps transistors (marked 6357B) is bad (smoked, fried, and toasted) took out the emitter resistor with it. anyway I have seached online for this transistor , looked in my Allied cat. , it isn't listed. anybody hear have any idea what this thing cross ref's. to.

                                                Rock On
Title: Re: 6357B NPN Power Transistors
Post by: teemuk on July 14, 2008, 10:31:53 AM
Peavey's cross reference tells that SJ-6357 is MJ15003, which is a 140V NPN power transistor in TO-3 case. Does it sound right?
Title: Re: 6357B NPN Power Transistors
Post by: Jack1962 on July 14, 2008, 03:37:28 PM
Yes that sounds about right the Voltage is a + and - 53 voltges on 2 sets of 4 in push-pull config , to reach 200 watts output power. Thanx Bro .
By the way if you don't mind saying where did you find the Peavey Cross-reference I couldn't find one?
Title: Re: 6357B NPN Power Transistors
Post by: teemuk on July 14, 2008, 04:43:39 PM
http://www.epanorama.net/schematic.php?file=schematicsforfree/Audio/Pro_Audio/Products/Peavey/Parts%20Cross%20Reference%20Guide.pdf
Title: Re: 6357B NPN Power Transistors
Post by: Jack1962 on July 14, 2008, 10:13:44 PM
Cool , Thanx Bro
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