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From: N_Cook on 21 Jun 2010 09:57
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.


From: Adam Sampson on 21 Jun 2010 11:48
"N_Cook" <diverse(a)tcp.co.uk> 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 <ats(a)offog.org> <http://offog.org/>
From: N_Cook on 21 Jun 2010 12:10
Adam Sampson <ats(a)offog.org> wrote in message
news:y2azkyoidzh.fsf(a)cartman.at.offog.org...
> "N_Cook" <diverse(a)tcp.co.uk> 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 <ats(a)offog.org> <http://offog.org/>


The info is out there, for all, in ASCII format now


From: Phil Allison on 21 Jun 2010 21:27

"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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