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Old 18th June 2009, 05:38 AM   #1
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Default Many question about Threshold S/** supply rails

I need to know how many voltage supply rails of these model, also current each channel :-)

S/550E
SA 3.9E
SA 4E
SA 12E

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Anadigit
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Old 18th June 2009, 03:21 PM   #2
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I'm sorry to say that I don't have that data. You can calculate it
fairly easily knowing the rated power of each amplifier and adding
about 10 volts to the voltage required to reach a peak wattage of
twice that power.

There was no current limiting to those amplifiers as I recall, so the
current was pretty high.

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Old 18th June 2009, 09:50 PM   #3
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Default Thanks

My S/550E was +/- 70 VDC, I need to change it to SA/4E.
Is it posible ?

Thanks
Anadigit
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Old 19th June 2009, 05:12 PM   #4
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I recall the SA4E as being 100 watts. You want to take the supply
down to 45-50 volts.

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Old 20th June 2009, 03:45 PM   #5
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Default Thanks PAPA

I seen 2N5566 in the front end of S/550E, could I use 2N3958 instead of 2N5566 ? (also 2SK170, 2SK389, 2SK129A)

Thanks for advance
Anadigit
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Old 20th June 2009, 04:50 PM   #6
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Yes, I expect so.

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Old 21st June 2009, 11:11 AM   #7
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Default SA/3.9E !?!

I never heard Threshold have SA/3.9E in line production !

Could anyone show it schematic ?

MPS-U10 and MPS-U60 are hard to obtain parts, Did someone have idea for substitute them ?

Thanks
Anadigit
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Old 21st June 2009, 05:19 PM   #8
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The SA3.9e was one of my favorites.

I have the schematics up on passdiy, but we changed the server
and I don't recall the new passwords, so I'll check tomorrow at work.

I have the U10's and U60's if you need them desperately, email me.

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Old 24th June 2009, 09:54 AM   #9
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Wink 125W model ?

Hi,
Thanks PAPA but I can find them in my local shop already.
I decide to build 125W version, How do I select correct supply voltage rails ?

Also bias adjustment

Thanks
Anadigit
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Old 25th June 2009, 02:45 AM   #10
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Default Re: 125W model ?

Quote:
Originally posted by ANADIGIT
Hi,
Thanks PAPA but I can find them in my local shop already.
I decide to build 125W version, How do I select correct supply voltage rails ? Also bias adjustment
125 W = 250 watt peak.

V^2 / 8 =250

V^2 = 2000

V peak = 45V

Add 10 volts or so, V supply = +/-55V

Bias it for heat sinks at 50-55 deg C.

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