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Thread: So, here I go. Phase Linear 400

  1. #1
    Forum Veteran VSAT88's Avatar
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    Like my BlueTooth ?

    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
    Forum Veteran VSAT88's Avatar
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    Like my BlueTooth ?

    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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    Halfbiass...Electron Herder and Backass Woof
    Does the protection relay click?
    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
    Forum Veteran VSAT88's Avatar
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    Like my BlueTooth ?
    Yes, it seems like it did. In order to tell you for sure I would need to hit the shop. It has been a long time since I fired it up. Cannot believe you answered so quick !

  5. #5
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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

  6. #6
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    Halfbiass...Electron Herder and Backass Woof
    Quote Originally Posted by VSAT88 View Post
    Yes, it seems like it did. In order to tell you for sure I would need to hit the shop. It has been a long time since I fired it up. Cannot believe you answered so quick !
    We aim to please. Won't be on much longer tonight though, 5AM comes early...
    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
    Forum Veteran VSAT88's Avatar
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    Like my BlueTooth ?
    I will do whatever you instruct me to but I am not in a rush. If you have time I will take any instruction you may offer and post back the result. Thank you.

  8. #8
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    Halfbiass...Electron Herder and Backass Woof
    You do have a problem with the 909's and 2SD555's in the same channel, not that that's your problem with a bright bulb, but does need to be addressed at some point.
    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
    Administrator
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    Halfbiass...Electron Herder and Backass Woof
    Does the bright/dim cycle coincide with the relay clicks??
    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

  10. #10
    Forum Veteran VSAT88's Avatar
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    Like my BlueTooth ?
    Now that you are reminding me I am almost 100% sure you are right. That is exactly what happens.
    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.

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