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Thread: So, here I go. Phase Linear 400

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  1. #1
    Journeyman Member VSAT88's Avatar
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    So, here I go. Phase Linear 400

    Hi, she was a working amp until I got scarred by some folks who said I was using a time bomb. Might have been true as the filter caps were stock and no bias readings were ever took (by me anyway). She had almost no DC offset in one channel and very little (well within range) on the other. I played it many many times in fact off and on for several years without any trouble whatsoever. I read on line a lot of differing opinions about it and one that made sense to me was that all the OP TX should be the same. I read the service bulletins and what I read said so as well. I decided to check a few things and found that the OPT were not all the same so after that I decided to replace a few things and add a few things. I bought the new filter cap set from White Oak. I bought the DC relay kit from Mr. Don and put it together with a parts order from Mouser. I called myself following the instructions exactly. I made another order before from Mouser to cover all the lytics (and only the lytics) for the main board/driver board. I installed them all myself of course. I put new silica under each OPT with wakefield in between each, not too little, not too much, just right. I checked all the resistors and found them to be well within range except a for a few and when I found those few in a set of four were a bit out I replaced all four. Some of this was tedious work for me as I am no longer a young man and I cannot see as well as I use to. I tried to do my best. I am going to post some pics here and if needed I will post more of whatever is asked. I hope you find my photographs good enough to see everything well. Now, the problem or may well not be a problem, I do not know. After all the work (including a new bridge rectifier by the way) when I bring it up on the DBT/veriac the bulb pulses. I stopped then and decided to ask for help. Yes, when I start turning the veriac up with the amp plugged into the DBT the bulb goes really bright then back to dim, really bright then back to dim. I have never encountered something like that before so now I ask kindly for your help. Jim.Click image for larger version. 

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  2. #2
    Journeyman Member VSAT88's Avatar
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    Sorry folks.

    looks like I do not know how to use the upload images feature well. Duplicate images. Please excuse, remove or tell me how to remove if it is an issue. My bad.

  3. #3
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    laatsch55's Avatar
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    Halfbiass...Electron Herder and Backass Woof
    Quote Originally Posted by VSAT88 View Post
    looks like I do not know how to use the upload images feature well. Duplicate images. Please excuse, remove or tell me how to remove if it is an issue. My bad.
    Not a problem, don't sweat it...
    taking something that's already good, and making it better...........and for the knowing smiles that cross their faces.......Nando-2011...

    "Silence cannot be Misquoted"--Lazarus Short-2012 "

    " I Just Collect Smiles Craig......Cheap Smiles!-----Fishoz-2017

    "anything can be done, it's finding the easiest way that's hard"-----Bobbysdad--2014

    " Synth percussion is deadly to children, house pets and shitty power supplies"---Stephen Evans 2014

    " You have not reached the point of diminishing returns, you've just ran out of money

    " The Pioneer U-24, unfortunately, is just too expensive and rare to find. That's why I have one."--Nando-2014

  4. #4
    Journeyman Member VSAT88's Avatar
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    I bought just the board and sourced from Mouser. Good probability I should have ordered something that I did not.
    Main System: PC-DAC and CD as well as Phonograph in to a Kenwood C2 w B&K 442 amp. Polk Audio SDA-SRS 2 speakers.

  5. #5
    Journeyman Member VSAT88's Avatar
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    OK. I will do just that and check back in as soon as I do. I think I am beginning to finally understand what is going on. I appreciate your help.
    Main System: PC-DAC and CD as well as Phonograph in to a Kenwood C2 w B&K 442 amp. Polk Audio SDA-SRS 2 speakers.

  6. #6
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    laatsch55's Avatar
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    Halfbiass...Electron Herder and Backass Woof
    I don't think the DC protect board is the problem, we just need to eliminate it's influence...
    taking something that's already good, and making it better...........and for the knowing smiles that cross their faces.......Nando-2011...

    "Silence cannot be Misquoted"--Lazarus Short-2012 "

    " I Just Collect Smiles Craig......Cheap Smiles!-----Fishoz-2017

    "anything can be done, it's finding the easiest way that's hard"-----Bobbysdad--2014

    " Synth percussion is deadly to children, house pets and shitty power supplies"---Stephen Evans 2014

    " You have not reached the point of diminishing returns, you've just ran out of money

    " The Pioneer U-24, unfortunately, is just too expensive and rare to find. That's why I have one."--Nando-2014

  7. #7
    Journeyman Member VSAT88's Avatar
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    "What happens when you isolate the DC protect board from the rest of the amp" ? Not sure what you mean by that if you mean taking out the relay and trying that way I do not remember doing so. There were no connections to the speaker posts during startup, no dummy loads either. I Did assemble the DC protect board myself . Looks like I goofed ??
    Main System: PC-DAC and CD as well as Phonograph in to a Kenwood C2 w B&K 442 amp. Polk Audio SDA-SRS 2 speakers.

  8. #8
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    laatsch55's Avatar
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    Halfbiass...Electron Herder and Backass Woof
    Well, that depends, did the kit have some .10uf/100 volt poly caps for C3, C8 and C9?
    taking something that's already good, and making it better...........and for the knowing smiles that cross their faces.......Nando-2011...

    "Silence cannot be Misquoted"--Lazarus Short-2012 "

    " I Just Collect Smiles Craig......Cheap Smiles!-----Fishoz-2017

    "anything can be done, it's finding the easiest way that's hard"-----Bobbysdad--2014

    " Synth percussion is deadly to children, house pets and shitty power supplies"---Stephen Evans 2014

    " You have not reached the point of diminishing returns, you've just ran out of money

    " The Pioneer U-24, unfortunately, is just too expensive and rare to find. That's why I have one."--Nando-2014

  9. #9
    Journeyman Member VSAT88's Avatar
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    As I recall yes, it did flash over and over with the relay clicking the whole time however I cannot be 100% on this without checking it out again. Accept for the fact that C3, C8 and C9 were not installed....
    Main System: PC-DAC and CD as well as Phonograph in to a Kenwood C2 w B&K 442 amp. Polk Audio SDA-SRS 2 speakers.

  10. #10
    Administrator
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    Halfbiass...Electron Herder and Backass Woof
    Ok, I would suggest the next step to be to unhook all wires from the DC protect board, tape up the bare ends of all wires so as not to short anything out and bring it up again.....

    Mouser had the IC for that board or did it come with it?
    taking something that's already good, and making it better...........and for the knowing smiles that cross their faces.......Nando-2011...

    "Silence cannot be Misquoted"--Lazarus Short-2012 "

    " I Just Collect Smiles Craig......Cheap Smiles!-----Fishoz-2017

    "anything can be done, it's finding the easiest way that's hard"-----Bobbysdad--2014

    " Synth percussion is deadly to children, house pets and shitty power supplies"---Stephen Evans 2014

    " You have not reached the point of diminishing returns, you've just ran out of money

    " The Pioneer U-24, unfortunately, is just too expensive and rare to find. That's why I have one."--Nando-2014

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