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Thread: Acoustic 470 Guitar/Bass amp

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    Thumbs up Acoustic 470 Guitar/Bass amp

    Hi, Could anyone please help point me to a readable circuit diagram for the Acoustic 470. Amp has been out of action for a few years and i dragged it out of the shed to check out for restoration. Still have the original bass cab with 2 x 15" Celestions.
    Thanx

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    Acoustic 470

    Hi Phostenix, I checked this one and found it to difficult to read, even spent time with my brother in a pic program to bring it up but no luck. I'll keep searching. ( I did consider building a different power amp stage but would rather keep it original)
    Thanx

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    Are you having trouble reading it on screen with Acrobat Reader or when you print it? You could purchase the schematic from musicparts.com (their watermark is on the schematic). I have the Acoustic 370 set from them & it's very readable (split into two 8.5 X 11 pages). It also includes the service manual & parts list, etc.

    $20 here (Paypal):
    Acoustic*Schematics

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    ST in Phoenix

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    Supporting Member gbono's Avatar
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    unicorn,

    Check out this site unofficial acoustic control corp forum - Message Board - Yuku

    If you need a schemo I can email you one - just went through one of these so ask away if you have questions.

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    Quote Originally Posted by gbono View Post
    ... just went through one of these so ask away if you have questions.
    Did you get that working?

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    ST in Phoenix

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    Supporting Member gbono's Avatar
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    Yes, the PA board had a few issues but what threw me for the longest loop was the fact that I used replacement covers on the output devices (TO-3's mounted on the back chassis panel) that kept the collectors from making contact!!! I'm very familar with the design of this amplifier now

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    What covers do the output transistors have? I have a 370 that will be my next project (& another one on the way) and it looks like your basic TO-3 socket. The 470 must have different mounts, so I'm curious.

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    ST in Phoenix

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    Supporting Member gbono's Avatar
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    check out this link and scroll down until you see real pictures of a 470 - can't miss the covers on the EXPOSED output transistors. You do not have the same mounting scheme on a 370.

    GuitarHeadOrBassHead470 < Acoustic < Wiki

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    Interesting. I'm not familiar with those covers.

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    ST in Phoenix

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    Old Timer J M Fahey's Avatar
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    I have the ones that work: 1 of the screw holes is 1/8", so the screw head keeps it firm, but does not touch the TO3 metal , and the other is slightly over 1/4", so the head slips through and makes contact with the case.
    Haven't used them for ages.
    That 470 is a mighty fine amp, but please *always* use the Guitar/Bass switch on "guitar". All it does is place a treble-killing choke in series with the speaker, muddying the sound innecessarily.

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    Supporting Member Jazz P Bass's Avatar
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    Acoustic 470 SM

    Here is the service manual.
    I got it from MusicParts.
    I workrd on one of these a while back.
    A real rats nest.
    Enjoy.
    John G
    Attached Files Attached Files

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    re 470 Acoustic

    A big thank you for the info. I have taken out the output board and drawn my own version of the Power Amp stage and have posted it on KENLINX - bbs.webhop.net. I have now repaired the amp to its former glory and the sound is awesome. We had been using a 250 Watt Jap amp with one 15" and two 10". The Acoustic 470 leaves it for dead.
    Cheerz

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    Remember 476

    Unicorn,

    Just read about your 470, glad to know it's working!
    I just wanted to say what a great bass amp you have there. I had one with the 2-15 406 cab also. Played a j-bass through it in a rock band. A great sound and "fun to mess with" controls. When I listen to the recordings of my band from that time, late 70's, It makes me wonder why I sold the amp! Sounds like you'll enjoy yours too.

    Brad

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    Thumbs up 470 Rig


    Thanks Mate, I'm actually a guitar player who likes to have a jam on bass occasionally. I have an old '69 Les Paul bass that sounds almost like a double bass through the Acoustic 470 (awesome). Our bass player now uses the 470, won't even look at the other thing he used to use.
    Many Cheerz

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    Quote Originally Posted by Jazz P Bass View Post
    Here is the service manual.
    I got it from MusicParts.
    I workrd on one of these a while back.
    A real rats nest.
    Enjoy.
    John G
    Apologies for the thread necromancy, but alas this attached file seems to no longer exist. Anyone archive a copy?

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  17. #17
    Supporting Member Jazz P Bass's Avatar
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    I seem to have misplaced my copy.
    Sorry.

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    Lifetime Member Enzo's Avatar
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    Nope...

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    Education is what you're left with after you have forgotten what you have learned.

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    Old Timer J M Fahey's Avatar
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    I only found the Power Amp.
    In case it helps:

    EDIT: there must be some problem, I uploaded the .PDF but it didn't "stick".
    Oh well.
    Attached Thumbnails Attached Thumbnails Acoustic470PA.pdf  

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    Juan Manuel Fahey

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    Lifetime Member Enzo's Avatar
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    I have the entire manual, in fact I just emailed it to bob p. But it won;t stick on here. If anyone can figure out a way to get them to work, I'll put it back up.

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    Education is what you're left with after you have forgotten what you have learned.

  21. #21
    Better Tone thru Mathematics bob p's Avatar
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    if anybody needs it, send me an email through the board. i'm going to leave the files in my inbox so it's easy for me to forward them while the board's problems get worked out.

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    "Stand back, I'm holding a calculator." - chinrest

    "I happen to have an original 1955 Stratocaster! The neck and body have been replaced with top quality Warmoth parts, I upgraded the hardware and put in custom, hand wound pickups. It's fabulous. There's nothing like that vintage tone or owning an original." - Chuck H

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    Hahahahaha....and it seems the board's problems extend to PM's too. Tried sending to you twice, the message went to the great big bit-bucket in the sky, alas.

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  23. #23
    Better Tone thru Mathematics bob p's Avatar
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    I got your two PM and forwarded the files to you by email each time. check your spam folder.

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    Aha, I got both of them, thanks!

    (But still, my 'sent items' folder has no knowledge of the PM's that I sent to you. Hence my thinking that they just plain disappeared into the aether....)

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  25. #25
    Better Tone thru Mathematics bob p's Avatar
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    Glad to hear that you got it. I've forwarded Enzo's email to a number of people already. Glad to help. But you guys might want to search the board before you ask for an email, because somebody already posted them, and AFAIK they're readily available on this site for download.

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  26. #26
    Better Tone thru Mathematics bob p's Avatar
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    Well, I had done a thorough search of the forums, and found what I was looking for, but the insidious datavore that's been making the attachments disappear had already got to them. Pardon me for not noticing a brand-spanking-new thread with (as yet) unmolested attachments. Sorry for all the trouble!

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  28. #28
    Better Tone thru Mathematics bob p's Avatar
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    No problemo. I'm keeping the schematics in my mailbox for a while so that they stay handy ... just in case there's a problem with the downloads. Enjoy!

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