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Thread: Carver 4000t Preamp rework/rebuild

  1. #1
    Forum Veteran WOPL Sniffer's Avatar
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    Screw it

    Carver 4000t preamp

    Any tips on rebuilding one of these? I got one coming to the shop in a week or so. I didn't find much on mods or a recap/parts list.
    Last edited by WOPL Sniffer; 06-12-2017 at 03:47 PM.
    I had the nations problems figured out one night while on acid in the 1970's. I wrote it down an a "Big Bamboo" rolling paper and you know what happened after that............ I'm too old to do any more acid so yer stuck with the shit mister.

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  2. #2
    Forum Veteran grapplesaw's Avatar
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    I will be interested in what you do to it as I have two. One is 4000 and other 4000t

    i want to add a remote volume controler like this on eBay

    ALPS motor potentiometer 3way 2.0 input Remote volume control Preamplifier Completed board+LED display 3 way 2.0 audio channel input

    2 remote control for the general purpose of a lot of buttons no effect, only (switching INPUT) (mute M) (volume +VOL+) (volume -VOL-) useful
    LED display volume CPU board size: 102x38MM motherboard: 70x60MM


    Here is the service manual Perry.

    http://thecarversite.com/manuals/man...e%20manual.pdf

    There is a couple of good threads in the forum here with upgrades for caps and opamps and some trouble shooting.

    The 4000t is only diffferent in the amount of time delay of the effect speakers.

    Lots st to read about in this operator manual.

    http://thecarversite.com/manuals/man...r%20manual.pdf
    try the Lightening Bolt WOPL 1000 for a hair lifting experience today

    Warning !!! Use only when you want to blown the town down

    proud father of the only Fully Comp dual 500, soon to be completed

  3. #3
    Forum Veteran marcok's Avatar
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    I'm very curious about any tech item
    I have a C 4000 preamp and till now I have only deoxed pots and switches ( every ten years )
    Chassis and connectors , etc .are the same as PL 4000 series 2 . ( very good )
    Recapping probably is useless , but ....
    Remember that recapping it's necessary for PL 4000 series 1 ,
    because all the 1uf and 2.2 uf have too low working voltage .
    I suggest only to replace the rear speaker connectors with banana connectors .
    Ciao
    Marco

  4. #4
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    Carver 4000t Preamp rework/rebuild

    Just finished up the Carver 4000t Preamp rework/rebuild.... It sounds very nice. I rebuilt the complete Power supply (+ and - 12 volts were kinda noisy), I did audio grade on all the caps which touched the 12 volts on all boards. The connectors and switches were dirty so I cleaned them, secured the floppy boards, and replaced a few other Electrolytic caps on the other boards (especially the noise reduction board).... I like the results. Should last for many years. He will be running this along with the WOPL Clair I built him.



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    I had the nations problems figured out one night while on acid in the 1970's. I wrote it down an a "Big Bamboo" rolling paper and you know what happened after that............ I'm too old to do any more acid so yer stuck with the shit mister.

    Big amps
    Kenner Close N Play

  5. #5
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    Wow, That's a clean looking unit. I was looking at an SAE amp just like yours on Ebay. And an audio analyzer too.
    I will be needing a preamp fairly soon.
    How does this Carver compare to the PL4000?
    Of course I know either are amazing after your magic touch.But just generally speaking, Does one have a better rep than the other?
    Last edited by Bradrock; 06-12-2017 at 02:51 PM.

  6. #6
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    Quote Originally Posted by Bradrock View Post
    Wow, That's a clean looking unit. I was looking at an SAE amp just like yours on Ebay. And an audio analyzer too.
    I will be needing a preamp fairly soon.
    How does this Carver compare to the PL4000?
    Of course I know either are amazing after your magic touch.
    This is the amp I have listed on flee-bay (analyzer too).

    I don't care for the 4000 series 1, but the 4000 series II has a big following. Hard to find although there is one Series II on the bay right now. A lot of his stuff (Bob Carver) looks the same as PL stuff pretty much on the inside.
    I had the nations problems figured out one night while on acid in the 1970's. I wrote it down an a "Big Bamboo" rolling paper and you know what happened after that............ I'm too old to do any more acid so yer stuck with the shit mister.

    Big amps
    Kenner Close N Play

  7. #7
    Forum Veteran marcok's Avatar
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    I'm very curious about any tech item
    I have a Carver C4000 and my father has 2 PL 4000 series 1 .
    Carver C4000 looks smoother than PL 4000 that I consider aggressive .
    Any way the circuits of both preamps are very standard ( except for special function ) .
    PL 4000 is based on BC 237B and C 4000 on RC 4136 ( quad 741 ) .
    These two preamps should be used if you appreciate the special functions .
    ( like me and my father ) .
    Ciao
    Marco

  8. #8
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    Just got a call from my buddy Chris for whom I built a Fresh WOPL 700 II and did the Carver 4000t rework. He said he wet himself and I asked if he got shocked, he said no, the amp and pre sound so awesome and quiet that he was speechless. Now, maybe he'll quit talking about his Macintush stuff.....

    I love it when I hear from a totally satisfied customer. BOINGGGGGG.
    I had the nations problems figured out one night while on acid in the 1970's. I wrote it down an a "Big Bamboo" rolling paper and you know what happened after that............ I'm too old to do any more acid so yer stuck with the shit mister.

    Big amps
    Kenner Close N Play

  9. #9
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    Screw it
    this is how they leave the factory. That flux causes corrosion and stray capacitance.......... IT'S GOT TO GO.............. The function switch was corroded and loose, tapping it made the system cut in and out. It's all good now, clean clean clean, re flow solder, use the ruby red eraser on the contacts... Very time consuming. I am going to find me a Carver 4000t. When reworked correctly, they pay off in sound 10 fold.




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    I had the nations problems figured out one night while on acid in the 1970's. I wrote it down an a "Big Bamboo" rolling paper and you know what happened after that............ I'm too old to do any more acid so yer stuck with the shit mister.

    Big amps
    Kenner Close N Play

  10. #10
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    Screw it
    I rebuilt 99% of the power supply. It was a bit noisy (not the worst I have seen). New + and - 12 volt regulators, got rid of the cheesy heatsinks too. New diodes for the rectifier, new Caps. I changed out ALL the caps which touched the + and - 12 volts throughout the Preamp.




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    I had the nations problems figured out one night while on acid in the 1970's. I wrote it down an a "Big Bamboo" rolling paper and you know what happened after that............ I'm too old to do any more acid so yer stuck with the shit mister.

    Big amps
    Kenner Close N Play

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