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I need the Best Cap I can find for a Reactive Load Powe Tool

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    J M Fahey
    Old Timer

  • J M Fahey
    replied
    .I know it was a big Blue 32uf 100 volt cap it was alot bigger than the IC brand
    Then it most certainly was a film type , not an electrolytic.

    Leave a comment:

  • nevetslab
    Supporting Member

  • nevetslab
    replied
    Originally posted by dumbassbob View Post
    That Ducati looks like it could handle anything There is No known schematic for the power tool I sent it to www, Pacair.com Steve Kenedy He put that IC cap in and changed the on off rocker switch for Free And it sounded OK for a few weeks Then it started going South I Never turn my Marshall volume past 5 it is So loud.The old Cap lasted over 10 years.I know it was a big Blue 32uf 100 volt cap it was alot bigger than the IC brand There is No other info on the Power Tool Ive had it 1994 The Preamp and FX loop all work great I know it is that cap,The amp guy I have here in North Hollywood Mike ClassicAmps was in Hospital for 2 months Im trying to get in touch with ..It is a easy fix I just want it beefed up to take that 8 ohm load Thanks everyone DAB
    As you're local to me (I'm in Burbank, sling-shot distance from the Burbank Airport runway), I have a bag of these 10uF MultiCap PolyPropylene Caps that were used for DC Blocking caps in Compact Monitor System's 3-way stage monitors (in line with the JBL HF drivers). Three of these would no doubt be suitable. I probably have some additional film caps of similar size if you need that extra couple uF.

    Click image for larger version

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    If interested, PM me. Steven/nevetslab




    Attached Files

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  • tedmich
    Old Timer

  • tedmich
    replied
    Originally posted by tedmich View Post
    see discussion here:
    http://www.amptone.com/pssystemspowertool.htm

    never seen a gut shot, if a Ducati 32uF 450V cap fits it would be poetic
    Click image for larger version

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    https://darel.lv/en/motor-capacitor/...707700000.html
    do realize that on most caps with a stud the threaded end is LIVE and needs isolation if its not directly to ground, Rifa's famous PEH169/200 caps have a special insulated acorn nut for this!

    Leave a comment:

  • dumbassbob
    Senior Member

  • dumbassbob
    replied
    That Ducati looks like it could handle anything There is No known schematic for the power tool I sent it to www, Pacair.com Steve Kenedy He put that IC cap in and changed the on off rocker switch for Free And it sounded OK for a few weeks Then it started going South I Never turn my Marshall volume past 5 it is So loud.The old Cap lasted over 10 years.I know it was a big Blue 32uf 100 volt cap it was alot bigger than the IC brand There is No other info on the Power Tool Ive had it 1994 The Preamp and FX loop all work great I know it is that cap,The amp guy I have here in North Hollywood Mike ClassicAmps was in Hospital for 2 months Im trying to get in touch with ..It is a easy fix I just want it beefed up to take that 8 ohm load Thanks everyone DAB

    Leave a comment:

  • tedmich
    Old Timer

  • tedmich
    replied
    see discussion here:
    http://www.amptone.com/pssystemspowertool.htm

    never seen a gut shot, if a Ducati 32uF 450V cap fits it would be poetic
    Click image for larger version

Name:	Ducati.JPG
Views:	99
Size:	12.0 KB
ID:	933140
    https://darel.lv/en/motor-capacitor/...707700000.html
    Attached Files

    Leave a comment:


  • Pixel
    replied
    Originally posted by Chuck H View Post

    Ok. And good to know. But just what IS the load circuit this device is using? Alas, no schematic.
    Google doesn't know much about the PS Systems Power Tool. There are a few instances where people discussing this device have thought it was based on Groove Tube's patent https://patents.google.com/patent/US4937874A/en

    The groove tube patent refers to RDH4 pages 837-838.

    The schematics in the above only have one capacitor each with values of 200-282 uF.

    Leave a comment:

  • Chuck H
    Bent Member

  • Chuck H
    replied
    Originally posted by Helmholtz View Post
    Just found that it's more than a passive reactive load:

    http://www.pacair.com/mmamps/EB100S/...ool_Manual.pdf
    Ok. And good to know. But just what IS the load circuit this device is using? Alas, no schematic.

    Leave a comment:

  • Helmholtz
    Old Timer

  • Helmholtz
    replied
    Just found that it's more than a passive reactive load:
    (Doesn't make guessing the cap's specs easier, but I'd say if the unit worked with a 32 ecap, a 32/100V or higher film cap as suggested by Leo Gnardo would be a reliable upgrade.)

    http://www.pacair.com/mmamps/EB100S/...ool_Manual.pdf




    Helmholtz
    Old Timer
    Last edited by Helmholtz; 05-28-2021, 01:49 AM.

    Leave a comment:

  • Chuck H
    Bent Member

  • Chuck H
    replied
    Also... You didn't say that the original capacitor was a 32uf/100V. You said that is what is in there. Being as the cap installed is suspected to be a polarized cap and the application is suspected to be for a non polarized cap I'll speculate that the 32uf value could be an additional error on the part of your "service tech". Do you know for certain what the original value was?

    Like Helmholtz mentioned, a capacitor as a load for the amplifier isn't appropriate. Further, a 32uf cap in series with any other load circuit isn't appropriate. It would be VERY beneficial to have a schematic right now.

    Leave a comment:


  • Pixel
    replied
    There is nothing wrong with the brand of cap you had. IC is a good brand of cap, there might be better ones but you aren't paying attention to the important feedback you are receiving here.

    Who replaced the cap? You probably have the wrong type of cap in there now and it may also be the wrong value. Post a few pictures of the insides of your PS Power Tool.

    Leave a comment:

  • Leo_Gnardo
    Old Timer

  • Leo_Gnardo
    replied
    Lookee here:

    https://www.parts-express.com/Dayton...acitor-027-440

    It's 31 x 60 mm. Or about 1 1/4" by 2 1/2" - IF it fits in your attenuator, I'd not waste another breath nor flap on the keyboard.

    $10.59, sandwich money. Plus shipping of course. Woops, there goes another sandwich...

    I've used similar Daytons in crossovers, also in talkboxes driven by 100W Marshalls. Never a failure.

    FWIW they do show a 33 uF version but it's out of stock at the moment. 30 uF I'm sure is close enough for rock & roll.





    Leave a comment:

  • Helmholtz
    Old Timer

  • Helmholtz
    replied
    Originally posted by dumbassbob View Post
    Yes it is 32UF 100 VOLT cap Like I said it takes all the output of my marshall into that first cap at 8 ohms But when I opened it up to see The cap was a little IC brand cap It started to sound bad after a few hrs.Where the Old cap was in there for 10 yrs..I just wanted to know who makes a really good cap sure isnt a IC I didnt want to go into a pro shop and Not have a clue
    It is impossible that the cap is wired directly across the amp's output (with nothing else in series) and without knowing the circuit we can only guess.
    If your unit is purely passive, there's only AC and you definitely need a non-polar (NP) cap.

    Ecaps have other relevant ratings than only capacitance and voltage, esp. max. temperature, lifetime and AC current. The latter is critical in a reactive load.

    The safest would be a film cap, as already suggested by others. But will be much bigger.

    Leave a comment:

  • Greg Robinson
    Member

  • Greg Robinson
    replied
    There's a pretty good consensus that the problem likely has nothing to do with "brand", but almost certainly because the part fitted was totally unsuitable. ANY brand, of the correct type of component should do just fine.
    If you're taking it to someone else to have the problem corrected, you probably won't have much choice about what brand, they'll have their usual stock/supplier. If you want to specify a brand expect to pay a "pain in the ass" tax, or need to supply it yourself.

    Leave a comment:

  • dumbassbob
    Senior Member

  • dumbassbob
    replied
    Yes it is 32UF 100 VOLT cap Like I said it takes all the output of my marshall into that first cap at 8 ohms But when I opened it up to see The cap was a little IC brand cap It started to sound bad after a few hrs.Where the Old cap was in there for 10 yrs..I just wanted to know who makes a really good cap sure isnt a IC I didnt want to go into a pro shop and Not have a clue

    Leave a comment:

  • Helmholtz
    Old Timer

  • Helmholtz
    replied
    Are you sure the original cap was 32F?
    Judging from typical reactive load circuits, 320F would be more likely.

    Leave a comment:

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