Marshall Master Lead combo, 1978
In for more basic problem but query here , should anyone know, as only a
Polish reference out there. All seems original in there and o/p devices TO3 Motorola, badged SCSP1 and SCSN1. Presumably , as only +/-24V rails 3055/2955 would be adequate , if required, but if anyone knows for sure, for future reference. |
Marshall Master Lead combo, 1978
"N_Cook" writes:
All seems original in there and o/p devices TO3 Motorola, badged SCSP1 and SCSN1. Presumably , as only +/-24V rails 3055/2955 would be adequate This schematic shows MJ3001 and MJ2501 as equivalents for SCSN1 and SCSP1: http://www.drtube.com/schematics/marshall/2099u.gif These are Darlington pairs, so they have much greater hFE than the 2N3055/MJ2955. They're only about a fiver a pair from Farnell. -- Adam Sampson http://offog.org/ |
Marshall Master Lead combo, 1978
"Nutcase_Kook" In for more basic problem but query here , should anyone know, as only a Polish reference out there. All seems original in there and o/p devices TO3 Motorola, badged SCSP1 and SCSN1. Presumably , as only +/-24V rails 3055/2955 would be adequate , if required, but if anyone knows for sure, for future reference. ** The devices are DARLINGTONS - dickhead. Did you not notice the total absence of DRIVER transistors - eh ??? The pair are MJ2501 and MJ3001. ..... Phil |
Marshall Master Lead combo, 1978
Adam Sampson wrote in message
... "N_Cook" writes: All seems original in there and o/p devices TO3 Motorola, badged SCSP1 and SCSN1. Presumably , as only +/-24V rails 3055/2955 would be adequate This schematic shows MJ3001 and MJ2501 as equivalents for SCSN1 and SCSP1: http://www.drtube.com/schematics/marshall/2099u.gif These are Darlington pairs, so they have much greater hFE than the 2N3055/MJ2955. They're only about a fiver a pair from Farnell. -- Adam Sampson http://offog.org/ The info is out there, for all, in ASCII format now |
Marshall Master Lead combo, 1978
"Adam Sampson" This schematic shows MJ3001 and MJ2501 as equivalents for SCSN1 and SCSP1: http://www.drtube.com/schematics/marshall/2099u.gif These are Darlington pairs, so they have much greater hFE than the 2N3055/MJ2955. They're only about a fiver a pair from Farnell. ** If someone fits 2N3055s and MJ2955s instead of the correct types, the transistors will run hot but deliver low power. Seen done it a few times and the repair tech could not figure it out. ..... Phil |
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