sstinc:First sstinc:Last wrote:
From: sstinc:"First sstinc:Last" <jamesbongiorno@...>
To everyone,
I am only going by memory. There is a possibility that I am wrong about the model
numbers and if so I will correct this error when I unpack all of my documentation.
Rest assured that there was an SAE amp that was rated at 500 watts per channel and
I do have the schematic. Maybe I didn't pay close enough attention to the title
block as I thought it was a 2600. We'll soon find out. In the meantime my
recommendations for upgrades still apply. I strongly advise against using the
Toshiba replacements devices as power outputs mainly because of the awful SAT
corners. The Motorolas are significantly better which of course means less
sticking under overdrive and a slight increase in power output as well as more
linearity under load. All for now.
James
gurriesm wrote:
From: gurriesm <gurriesm@...>
Hello all,
I talked to James on the phone and it looks like James has a schematic
that is for a SAE monster amp that was never produced that is labled
2600. (A prototype that never got a model number but was started from the
orignal 2600 production schematics.) I still think it is the A1001 but
he does not think so. He schematics are still all packed so he cannot
verify. He just remembers the block diagram of a drawing labled 2600.
So some interesting possibilites of untold history of SAE AMP development
may exist in James vast SAE technical documentation. Cooool!!!!
rom: sstinc:"First sstinc:Last" <jamesbongiorno@...>
Dear Mark,
I beg to differ but I have a full blown schematic on the "2600" which clearly
shows 24 output devices per channel that is 2 blocks consisting of a driver
and 6 outputs for the positive rail and 2 blocks of a driver and 6 outputs
for
the negative rail all at a power supply voltage of +/- 120 volts.
Multiply this by two and you get 48 devices. What schematic are you looking
at?
James
Mark Gurries wrote:
From: Mark Gurries <gurriesm@...>
First sstinc:Last sstinc: wrote:
From: sstinc:"First sstinc:Last" <jamesbongiorno@...>
I almost forgot: there are 48 output devices in the 2600. If you used the
Toshiba parts it would cost you $864.00.
Nope, the 2600 has 16 outputs (8/chan) and was the 400Watt/Chan with a
fan that came out in 76-77. You are thinking of the huge A1001 at
500W/chan that has no fan that replaces the 2600 that was part of the
"01" line. But you are right about cost. As impressive as A1001 is,
that addition 1db of headroom just is not worth it size, weight or
potential repair cost.
Best Regards,
Mark Gurries
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WRK(408) 954-8400 x3864 Email: gurriesm@...
FAX(408) 428-9413 WebSite:
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To: James Bongiorno &
Mark Gurries
There has been a lot of correspondence these last few days about the SAE
2600 amplifier. Mark is right. There are 8 Output transistors, 4 Driver
transistors, and 4 Pre-driver transistors Per Channel. I have one of
these amps and I also have the service manual for it. The SAE2600 and
SAE 2500 are almost identical in circuitry, except for a couple of extra
diodes, different Output Transistors and a different power transformer.
I finally got the specification on the Toshiba 2SA1837(PNP) and the
2SC4793(NPN) which you recommend, which is ( Vcbo=230v, Vceo=230v,
Vebo=5v, Ic=1A, Ib=0.1A & ft=100MHz). These must be the Pre-Driver
transistors. You said the Driver transistors must be very high voltage
(BVceo=250v) and 8 amps collector current. Do you have have any
recommendations? The ECG-87's & 88's have a (BVceo=250v & Ic=10Amps)
which seem to fit the required parameters for the Driver transistor, but
are twice the size of the old 11-0066B & 11-0072B which came in a TO-66
package. If you think we could use these, couldn't we etch a new Driver
board to except the TO-3 case which the ECG-87's & 88's come in, or
modify the existing driver board to except the TO-3 case. The new Driver
board would only have to be 1/2 inch taller to except these transistors.
I have a picture of the new driver board for the SAE2500 & 2600 amps,
but when I attached it to this e-mail it is to large for your server at
your end, and is returned to me undelivered.
Every ones opinion would be greatly appreciated.
Regards, Bob Ludka
PS. I hope to take delivery of two SAE 2500 Amplifiers in the next few
days, which probably need some type of repair and transistors.
