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Thread: PL 3300 Series II rebuild/upgrade

  1. #1
    Forum Veteran scottonnob's Avatar
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    PL 3300 Series II rebuild/upgrade

    I'm going to rebuild a 3300 that's been sitting on a shelf for a couple years. An NAD pre that I had been using is no longer working properly. I bought the 3300 to replace the NAD anyway, but I just never got around to working on PL unit. And just to once again express my appreciation for all the generous assistance that comes from this site, Dennis is already helping me out with parts and procedures. Thanks Dennis.

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  2. #2
    Forum Veteran scottonnob's Avatar
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    3300

    A good friend of mine, who has since passed away, used to sell upgrade kits for PL products. None of his stuff is still around, but I found this document in my files. It's from his kit I used to rebuild my first 3300. So I'm just curious what you guys think of this particular modification.

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  3. #3
    Administrator Gepetto's Avatar
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    Old 'Arn Enthusiast
    Quote Originally Posted by scottonnob View Post
    A good friend of mine, who has since passed away, used to sell upgrade kits for PL products. None of his stuff is still around, but I found this document in my files. It's from his kit I used to rebuild my first 3300. So I'm just curious what you guys think of this particular modification.

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    It is an extremely good upgrade from the original RC only power supply filtering

  4. #4
    Forum Veteran marcok's Avatar
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    I'm very curious about any tech item
    The LM 78xx and LM 79xx are perfect fixed dc regulators and they are perfect " ripple killers " .
    Anyway your circuit is not " good " , because caps values are not coherent with typical applications .
    Replace 0.1 uF with 100 uf and 1 uF with 47 uF .
    The rule is : input caps must be twice the output caps .
    There is also another empiric rule : 1uF = 1mA .
    So these values are good up to 100mA .
    You can easily check the typical ANs .
    To be honest I have not understood the values used in your circuit .
    Ciao
    Marco

  5. #5
    Administrator Gepetto's Avatar
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    Quote Originally Posted by marcok View Post
    The LM 78xx and LM 79xx are perfect fixed dc regulators and they are perfect " ripple killers " .
    Anyway your circuit is not " good " , because caps values are not coherent with typical applications .
    Replace 0.1 uF with 100 uf and 1 uF with 47 uF .
    The rule is : input caps must be twice the output caps .
    There is also another empiric rule : 1uF = 1mA .
    So these values are good up to 100mA .
    You can easily check the typical ANs .
    To be honest I have not understood the values used in your circuit .
    Ciao
    Marco
    The existing bulk caps are still used in conjunction with this add on circuit. Thus there is very much more capacitance on both input and output after this add on is installed.

  6. #6
    Forum Veteran marcok's Avatar
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    I'm very curious about any tech item
    Thank you Joe ,
    Now it's clear ! I have meant to connect this circuit after the rectifier .
    I apologize for my mistake .
    Ciao
    Marco

  7. #7
    Forum Veteran scottonnob's Avatar
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    Since my friend Lou passed on a couple years back (2014), and since all of his work is now unavailable, I thought I'd post the instructions that he supplied with his kits, which he sold on Ebay. The kits are no longer available anywhere, but I thought perhaps some of you more knowledgeable guys might comment on the upgrades he used to recommend. I know that Lou would be pleased to think his work hasn't been entirely erased from the community.


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  8. #8
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    I know nothing of the upgrade. But I do know one thing;

    Flat trackers ROCK!!!

  9. #9
    Forum Veteran Northwinds's Avatar
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    Thank you for contributing this! These documents are nice to have in the PL archives here
    "I really can't begin to describe what happens at that frequency when you hit that SPL, but it's serious. We saw a mouse stagger out of a crack in the concrete floor and die"
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  10. #10
    Forum Veteran NavLinear's Avatar
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    Scott and I want to come up with a comprehensive list of components to swap out such as metal film resistors to replace the carbon comp ones where improvement can be gained, replacing the electrolytic capacitors and capacitors in the signal path where improvement can be had. ICs will also be upgraded, pots cleaned and... I'm gathering information from one of Lee's 3300 II upgrade threads that include a number of inputs from Joe that we'll use here. My plan is to list of components to be replaced and couple that with part numbers of the new components.

    I have a question for you guys about the lower value capacitors. What series do you use for audio signal path capacitors? I'm having trouble locating metalized or film or foil polypropylene and/or polyester capacitors below 33pF. WIMA produces a series (FKP2) that begins at 33pF and up. These are rated to 1000V and in the preamp circuit we're dealing with low voltages. We want to replace capacitors down to 10pF. I've located Cornell Dubilier silver mica caps series that go down to 1pF. Here's a part number of a 10pF cap as a reference - CD5CC100JO3F.

    Any thoughts regarding a best path forward is appreciated.
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