Il giorno venerd́ 1 febbraio 2002 20:57:36 UTC-6, Trevor Wilson ha scritto:
> "Paul Sanchez" wrote in message
> news:ijE68.82158$XZ1.3836973@typhoon.austin.rr.com...
> > I've got a Marantz 250 with all the transistors blown on one side. I've
> > located/identified all of them except 2!!!
> > I can't find any sj2582 or it's substitute. Nor it's "unknown" complement.
> > Can anyone help.
> > BTW, I've been all over the web in search of these transistors to no
> avail.
> > Any help is appreciated.
>
> **They were Marantz in-house numbers. As such, no documentation, outside
> Marantz is available. The devices you are seeking, though, are the
> pre-driver transistors. TO-3 package and with a VCER of greater than 130
> Volts. The SJ2582 (PNP) can be replaced by a 2SC2238. It's complement, the
> 2SA968. Both of the replacements are more linear and will allow (slightly)
> better performance from your 250. The same devices can be safely used as
> driver transistors (coded SJ2586 and SJ2585), as well. Output devices can be
> substituted with MJ15003/4 devices. Indeed, the MJ15003/4 devices were used
> in later model Marantz 250M amplifiers.
>
> NOTE WELL: All pre-driver, driver and output devices, for the 250 MUST be
> hFE matched, to within 30%. Otherwise, reliability and performance WILL be
> compromised.
>
> Also important: In a major failure of this model (output devices, etc), look
> very carefully at the low(ish) value carbon resistors, R528 & R527. These
> can fail, without any visible signs. As can R529 & R530. Though that is less
> common. You might also check the relay for damage. Contacts usually weld
> together, due to the thoughtless proctection system provided by Marantz (and
> most other manufacturers of the time).
>
>
> --
> Trevor Wilson
> www.rageaudio.com.au
Hallo, I need the power stage and driver for my Marantz 250, that is: SJ2519
and SJ2520 plus pre: SJ2586 and 2585.
Can anybody help me to know where I can find them ?...or which exactly
substitute I can be use and where I can buy?...
Thanks, best regards
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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