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Thread: Mark goes at it again... just bought a PL700/II!

  1. #21
    Forum Veteran MarkWComer's Avatar
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    Quote Originally Posted by WOPL Sniffer View Post
    Mark, I thought you were going to WOPL this amp??? Testing is kinda a moot point since a WOPL will gut it completely...
    I tested as far as possible, don’t have a way of measuring THD, power output, etc. I’m just a hobbyist, would love to have a comprehensive checkout both before and after for full comparison.

    Yes, I agree- it really is moot, but again, a before and an after is a good thing. Half the purpose of the video is for the first- timers, the other half is to avoid the minor errors of the first “surgery.”

  2. #22
    Forum Veteran WOPL Sniffer's Avatar
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    Screw it
    The before info is in the Service Manual. Good luck on the WOPL.
    I had the nations problems figured out one night while on blah blah blah........ huh?

    Big amps
    Kenner Close N Play

  3. #23
    Forum Veteran MarkWComer's Avatar
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    Quote Originally Posted by WOPL Sniffer View Post
    The before info is in the Service Manual. Good luck on the WOPL.
    Fun with a video camera... I get bored.

  4. #24
    Forum Veteran JustMike's Avatar
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    Hi ya Mark. Good to see you buddy. Enjoyed your video, but would have liked to have seen the dbt test light go all the way to full bright and then
    back to dim. Or was I missing something ?

    I would like to hear your opinion on how the Amp sounds now compared to your 400 on the same source and speakers.
    The 700 has gain controls so you can control the output if you have a concern that you may over amp your speakers. What speakers do
    you have on the 400 now ?
    This would be an interesting comparison before you change to WOPL and full comp. on the 700.
    You might like what you hear, Fire that baby up man.
    The best,
    jm


    " There is only two kinds of songs; there's the Blues, and there's Zip-a-dee-doo-dah." -- Townes Van Zandt







  5. #25
    Forum Veteran MarkWComer's Avatar
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    Quote Originally Posted by JustMike View Post
    Hi ya Mark. Good to see you buddy. Enjoyed your video, but would have liked to have seen the dbt test light go all the way to full bright and then
    back to dim. Or was I missing something ?

    I would like to hear your opinion on how the Amp sounds now compared to your 400 on the same source and speakers.
    The 700 has gain controls so you can control the output if you have a concern that you may over amp your speakers. What speakers do
    you have on the 400 now ?
    This would be an interesting comparison before you change to WOPL and full comp. on the 700.
    You might like what you hear, Fire that baby up man.
    The best,
    jm
    The bulb did start bright and dimmed, the auto-exposure on the cheap-o camera probably compensated.

    Yeah- an A|B test wouldn't be a bad idea. Worried more about a full 350 watt startup THUMP than anything else, my ears really can't stand full volume from the 400 as it is, so I don't think I'd blast it anyway. No protection circuit installed yet, so I'm a bit cautious.

    I have a pair of A|D|S L-1290 towers, a bit grainy and harsh in the midranges, insufficient body to the bass for my liking, but that's what I have. (Considering a Klipsch active subwoofer...)

    A friend gave me a pair of Cerwin Vega VS-120, even harsher in the mids, but the bass is a bit better. They're 4Ω, I have 4Ω 50w resistors in series with the speakers and a Pioneer SX-780 in the living room. (Darlington outputs- I don't think they like loads less than 8Ω.)

    I took a repair job on a Mackie SR1530 active PA system last month, 15" ported woofer. Bass I could feel in my chest. Horn loaded mid, again, a little harsh. Sparkly tweeter, though. With the comments I've made about midranges, I think it may be time for a hearing test...

    My first speakers were the Heathkit version of the AR-3a. Those were nice and smooth, and shook the floor to my satisfaction.

    Yeh... smartie idea!

  6. #26
    Forum Veteran MarkWComer's Avatar
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    Any pictures of the White Oak 700 chassis anywhere?

  7. #27
    Forum Veteran JustMike's Avatar
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    I think you would be fine . Are there inline fuses on your main speakers ? That adds a little insurance for the tweeters on start-up.
    My first original Pl700 series II I bought new in 1978 I think. I still have it but its shelved waiting for an upgrade someday. Still works.
    I used it on infinity Monitor Jr.'s, Dahlquist DQ-10's , Bose 301's, Advents , EPI's and Genesis 1's. I never blew a fuse in any of them
    or damage a driver from the turn on thump. And it was a thumper!

    I'm running two full comps now. One 700II and one 400II bi-amped thru an active crossover.

    Have fun Mark, enjoy your rebuilds.
    cheers,
    jm


    " There is only two kinds of songs; there's the Blues, and there's Zip-a-dee-doo-dah." -- Townes Van Zandt







  8. #28
    Administrator Gepetto's Avatar
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    Quote Originally Posted by MarkWComer View Post
    Any pictures of the White Oak 700 chassis anywhere?
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  9. #29
    Forum Veteran MarkWComer's Avatar
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    Quote Originally Posted by Gepetto;22[IMG
    http://forums.phxaudiotape.com/attachment.php?attachmentid=32081&stc=1[/IMG]

    OY! Such a beauty! I especially like the power connector!
    Last edited by MarkWComer; 07-29-2018 at 05:22 PM.

  10. #30
    Forum Veteran MarkWComer's Avatar
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    Another shits & giggles video...

    Interesting thing about the amp still playing after the power is turned off!

    Meter display switch seems to be wired in reverse- isn't -20db supposed to be when the switch is depressed?

    Played a few records for an A/B test, but buzz in the 700 muddied the bass, audio was a little harsh compared to the 400. (Not a fair test...)

    Requested an invoice for the backplanes today.


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