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  1. Replies
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    The specs are the same on those 3 amplifiers down...

    The specs are the same on those 3 amplifiers down to 2 ohms stereo, 4 ohms mono. Performance wise there is no noticeable difference unless the load drops below that limit which then the PM860 (S860)...
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    Hello, The PCR800, PM840 and PRO POWER ONE use...

    Hello, The PCR800, PM840 and PRO POWER ONE use 4 output mosfets per channel, the PM860 uses 6. The PCR800 uses four S4010L 10A 400V SCRs on the power supply while the PM840, PRO POWER ONE and...
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    It is better to replace them all.

    It is better to replace them all.
  4. Replies
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    "PM 860 inputs are 1/4" phone plug. Well, at the...

    "PM 860 inputs are 1/4" phone plug. Well, at the very least, MINE ARE!

    Awesome post!"

    Yes, you are correct.
  5. Soundcraftsmen A200, A200PRO, A400, A400PRO Schematics available...

    At the akdatabase.
  6. Soundcraftsmen Pro Control Three & Four schematics available...

    Shoot me a pm or go to akdatabase.;)
  7. Replies
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    A full pic.;) 55169

    A full pic.;)

    55169
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    SP4002 with eq board removed for access. Note...

    SP4002 with eq board removed for access. Note that it has one less op amp because it does not have the inverting circuitry used on the DX4002 for bridging amplifiers.

    55168
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    DX4000 (preamp minus eq) internals, (picture...

    DX4000 (preamp minus eq) internals, (picture stolen from another forum, apologies to the poster if needed).

    Notice the main op amp in the middle under the bunch of wires (purple, gray, black,...
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    Yes, that is definitely the best route. I used...

    Yes, that is definitely the best route. I used the TL075 because they were in the phono section. I think the previous owner upgraded them. When choosing op amps for the browndog adapter remember some...
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    I had the same problem with a SP4002. There are a...

    I had the same problem with a SP4002. There are a few differences and updates but layout is the same. Unlike amplifiers which have lethal voltages everywhere even after turn off (some), there's not...
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    Hello Cyclecamper, Yes, that was an error on...

    Hello Cyclecamper,

    Yes, that was an error on my part. The PM1600, Pro-Power 8, PR1800, 900X2, A900PRO are all the same amplifier except that the PM1600 does not have the protection circuitry board...
  13. Replies
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    Hello, Like JBLAddict said the SC should not...

    Hello,

    Like JBLAddict said the SC should not have an issue moving those speakers. My previous experience with one of my A400PROs was similar and I traced the problem to the input board. There was...
  14. Replies
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    Thanks MJWPicMan, I have owned several of...

    Thanks MJWPicMan,

    I have owned several of these amplifiers for a long time and was always puzzled about their return of quality sound and power per dollar vs. other brands of the same era which...
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    cadex18, Please send me your email by private...

    cadex18,

    Please send me your email by private message.

    Rick.
  16. Replies
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    A better example... ...

    A better example...

    http://www.e-dan.co.uk/electronics/wiringtrans.html

    http://www.e-dan.co.uk/electronics/wiring.gif

    Good luck.
  17. Replies
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    Hello Titanium Dome, I don't have a DX4200 to...

    Hello Titanium Dome,

    I don't have a DX4200 to use as a reference but I will explain it in a simple way.

    Transformers which are dual voltage have 2 pairs of primaries (4 wires).

    So if the...
  18. Replies
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    William, Check your email.

    William,

    Check your email.
  19. Replies
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    Hello William, Please PM me your email. ...

    Hello William,

    Please PM me your email.

    BTW,

    Did you replace the input (25mfd np) caps?
  20. Replies
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    Hunter, What kind of speakers do you have? ...

    Hunter,

    What kind of speakers do you have?

    What's their impedance?

    What is their maximum wattage rating?

    Can they be bi-amped? This is a safer route but not as much wattage.
  21. Replies
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    Hello, Any amplifier which is bridged must be...

    Hello,

    Any amplifier which is bridged must be at least 4 ohms stable in stereo mode (your amps are). The reason for this is because once bridged the left (a) will see half the load and the right...
  22. Replies
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    William, Here are some links to the output...

    William,

    Here are some links to the output transistors available today for the soundcraftsmen models with mosfet outputs.
    ...
  23. Replies
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    Cool. That's the same PP3 without LED's I took...

    Cool.

    That's the same PP3 without LED's I took the picture of the input board.

    I have the same eq in excellent condition in the closet.

    Maybe I should sell it.
  24. Replies
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    Hello, The schematics for the output section...

    Hello,

    The schematics for the output section for both amplifiers is almost if not identical even if the PCB boards look different.

    The power supply and fan on the PP3-4 pushes it to 205W/CH at...
  25. Replies
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    209,788

    Hello, The schematics for the output section...

    Hello,

    The schematics for the output section for both amplifiers is almost if not identical even if the PCB boards look different.

    The power supply and fan on the PP3-4 pushes it to 205W/CH at...
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