Re: G08 part sources?

Doh, not what you were saying...

I've got some other transistor cross references that Rodger Boots did
for me, and I haven't posted them anywhere yet. Rodger did some neat
research into replacements that would have different packages and
pinouts, but which could be easily modified to work. Basically, for the
MPSU10, here is a list of *potential* replacements.

Audio/Video Amplifier in TO-202 (oe equivalent) Case
----------------------------------------------------
        Max. Current Max. Voltage Package/
NPN Rating (pair) Rating (pair) Pin Name
----- ------------ ------------ --------
2N6558 500 mA 300 V TO-202
MPSU10 500 mA 300 V TO-202
SK3232 500 mA 300 V TO-202
MJE340 500 mA 300 V TO-126
D40P3 500 mA 180 V TO-202
BF859A 300 mA 300 V TO-202 ECB
NTE171 100 mA 300 V TO-202 EBC

tm

tom mcclintock wrote:
>
> Well, kinda. The 2N6259 is the superior part and there is no sufficient
> replacement - if you want your G08 to work for a while :)
>
> And I quote (or rather cut and paste):
>
> "Rodger Boots had the following to say about the 2N6259 transistors
> There is nothing wrong with the 2N6259 and you are going to be hard
> pressed to find a better part. Just because the NTE388 LOOKS to be a
> better part doesn't tell the whole story. There is not much out there
> that has better secondary breakdown characteristics than a 2N6259, but
> you will never tell that by looking at just numbers, you need to see a
> breakdown chart. This will show you where secondary breakdown is.
>
> For example, looking at the 2N3716 data sheet you will see that at full
> voltage (80 volts) the part will withstand 0.2 amps. That is only 16
> watts allowed for what is supposed to be a 150-watt part! Compare that
> with a 2N6259 that can take 200 watts of dissipation with 90 volts
> across the part! It is about a 200-watt part and you can dissipate ALL
> OF IT with 90 volts across the part!!! A normal transistor would go into
> secondary breakdown (definition: localized melting of the junction due
> to current hogging - very destructive) at 20 to 40 volts. There are VERY
> few transistors that even come close to what this thing can do.
>
> What kills the 2N6259 is over voltage, plain and simple. The part is
> rated for (I think) 125 volts, maybe as high as 150. However, the G08
> uses +/-63 volts IDEALLY. So when the amplifier swings to the rail
> during a fast vector draw you have close to 125 volts."
>
> tm
>
> "Mills, Lewis" wrote:
> >
> > Mouser has the 2N6259 for US$7.45
> >
> > MPSU10 looks like: Vceo=300V, Ic=500mA, hFE@Ic=30mA=30min, fT=60MHz, Pd@25c
> > case=10W. You can try an RFQ to American Microsemi
> > (http://www.americanmicrosemi.com/cgi-bin/rfqentry.cgi?action=enterrfq&sourc
> > e=web&link=141292&query=mpsu10).
> > It appears to cross to 2N6558, which crosses to MJE340 or NTE171, both
> > available from Mouser.
> > Lewis
> >
> > > -----Original Message-----
> > > From: owner-vectorlist@synthcom.com
> > > [mailto:owner-vectorlist@synthcom.com]On Behalf Of peter jones
> > > Sent: Tuesday, July 16, 2002 3:16 PM
> > > To: vectorlist@synthcom.com
> > > Subject: Re: VECTOR: G08 part sources?
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: "Mark Jenison" <jenison@enteract.com>
> > > To: <vectorlist@synthcom.com>
> > > Date: Wed, 10 Jul 2002 13:51:09 -0400
> > > Subject: VECTOR: G08 part sources?
> > >
> > > >
> > > > Hi all,
> > > >
> > > > Has anyone found sources for the following parts?
> > > >
> > > > MPSU10/NTE191/ECG191/SK3232
> > > > 2N6259
> > > > Custom IC 600 (would it be possible to engineer a
> > > replacement pcb for this
> > > > chip?)
> > > >
> > > > ...or has someone bought up all these in preparation to
> > > release the new and
> > > > improved G09! ;-)
> > > >
> > > > --
> > > > Mark Jenison
> > > >
> > > 1st. please stop quoting NTE / ECG numbers, these are not real parts.
> > >
> > > MPSU10 - ?2.00 + tax (u.k.)
> > > http://www.grandata.co.uk
> > >
> > > 300v .5amp NPN (if i new the max frequency i could find a
> > > modern equiv)
> > >
> > > i will check on the other stuff.
> > >
> > > --------------------------------------------------------------
> > > -------------
> > > ** To UNSUBSCRIBE from vectorlist, send a message with
> > > "UNSUBSCRIBE" in the
> > > ** message body to vectorlist-request@synthcom.com. Please
> > > direct other
> > > ** questions, comments, or problems to vectorlist-owner@synthcom.com.
> > >
> > ---------------------------------------------------------------------------
> > ** To UNSUBSCRIBE from vectorlist, send a message with "UNSUBSCRIBE" in the
> > ** message body to vectorlist-request@synthcom.com. Please direct other
> > ** questions, comments, or problems to vectorlist-owner@synthcom.com.
> ---------------------------------------------------------------------------
> ** To UNSUBSCRIBE from vectorlist, send a message with "UNSUBSCRIBE" in the
> ** message body to vectorlist-request@synthcom.com. Please direct other
> ** questions, comments, or problems to vectorlist-owner@synthcom.com.
---------------------------------------------------------------------------
** To UNSUBSCRIBE from vectorlist, send a message with "UNSUBSCRIBE" in the
** message body to vectorlist-request@synthcom.com. Please direct other
** questions, comments, or problems to vectorlist-owner@synthcom.com.
Received on Tue Jul 16 15:05:27 2002