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  1. Thread: speaker hum

    by pyonc
    Replies
    6
    Views
    1,139

    Hi, glad to hear from you. Actually I don't...

    Hi, glad to hear from you.
    Actually I don't hear any hum or noise from the amp itself.
  2. Thread: speaker hum

    by pyonc
    Replies
    6
    Views
    1,139

    Thanks for your kind reply. With no input, just...

    Thanks for your kind reply.
    With no input, just MC 30 & speakers:
    With GAIN button all the way down, I hear a little, but still audible hum.
    Clearly it's loud60 hz hum.
    Looks like I take it to...
  3. Thread: speaker hum

    by pyonc
    Replies
    6
    Views
    1,139

    speaker hum

    Currently McIntosh MC30 mono block hooked on to JBL Olympus, with McIntosh C22 (just serviced).
    Now, I hear audible hum from one of the speakers. 60Hz, I think.
    As this is the tube preamp, I...
  4. Thread: audible pop

    by pyonc
    Replies
    1
    Views
    672

    audible pop

    I currently listen to JBL Olympus with McIntosh MC240 as the power and McIntosh C22 as the tube preamp.
    Now, all good except for the audible pop through the speakers when I turn off the power amp,...
  5. Replies
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    756

    LE 25-2 damper ring

    Hi,
    4311 studio monitors and other vintage JBL models have LE25-2 tweeters with damper rings.
    By now they're worn out like that you see in the pic.
    Now, I've a question:
    Does it have any effect...
  6. Thread: Any opinion?

    by pyonc
    Replies
    10
    Views
    1,288

    Interesting. Do you have the pic of that PR10...

    Interesting. Do you have the pic of that PR10 with the cut-out spider?
  7. Thread: Any opinion?

    by pyonc
    Replies
    10
    Views
    1,288

    Thanks for your feedback. I have the very early...

    Thanks for your feedback.
    I have the very early 1964 model of C54 Trimline with LE8-1 (later LE8T), and this early PR8.
    No spider cut like that on this PR. And I googled on this to check if there...
  8. Thread: Any opinion?

    by pyonc
    Replies
    10
    Views
    1,288

    Thanks so much, Widget! I agree with you. So,...

    Thanks so much, Widget! I agree with you.
    So, there is no possibility of JBL producing such a PR8 with the cut spider, right?
  9. Thread: Any opinion?

    by pyonc
    Replies
    10
    Views
    1,288

    Any opinion?

    Here are two pics of JBL PR8, passive radiator of early version of LE8T.
    One on the top is intact, and the other one looks like broken or split (?).
    Is this split thing okay? Any effect on the...
  10. Thread: 8ohm vs 16ohm

    by pyonc
    Replies
    6
    Views
    1,225

    Thanks a lot, grumpy and Eark K for your valuable...

    Thanks a lot, grumpy and Eark K for your valuable comments!:applaud:
    By the way, my C54 is a very early one, but its LE8-1 (not LE8T) is 8ohm, not 16 ohm.
  11. Thread: 8ohm vs 16ohm

    by pyonc
    Replies
    6
    Views
    1,225

    Got it. But the thing is the 8 ohm power amp. If...

    Got it. But the thing is the 8 ohm power amp. If I use this 16ohm driver speaker with this 8 ohm speaker, don't you think it affects the volume, given the difference of ohm? I think I read it...
  12. Thread: 8ohm vs 16ohm

    by pyonc
    Replies
    6
    Views
    1,225

    8ohm vs 16ohm

    Hi friends,

    I've got a vintage C54 trimline, with the 8ohm LE8T full-range driver, with no network.
    I'm thinking of replacing it with 16 ohm driver. And any sonic benefit?
    Thanks for your...
  13. Replies
    2
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    853

    Thanks for your detailed and kind explanation and...

    Thanks for your detailed and kind explanation and sharing your observation. Actually I'm shopping at the moment.
    As I have McIntosh MC240 to drive C50 Olympus, I've been looking for its right tube...
  14. Replies
    2
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    853

    tube preamp for JBL vintage speakers

    What do you think is the best tube preamp for JBL Olympus?
    I'm thinking of Mcintosh C20 or Audio Research SP8.
    Any other vintage tube preamp recommendation?
    Any opinion appreciated. Thanks.
  15. Replies
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    1,176

    Thanks a lot for your kind and considerate...

    Thanks a lot for your kind and considerate feedback. Looks like this is a challenging task unless I find the same part of the same preamp unit.
    Actually, with the loudness switch off, the volume...
  16. Replies
    5
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    1,176

    Thanks for your kind reply. This a copy of the...

    Thanks for your kind reply.
    This a copy of the schmatic that the technician sent me, saying the volume part is bad. He says he can't find the part.
  17. Replies
    5
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    1,176

    finding JBL vintage parts

    Hi

    Does anyone know where to find the parts of vintage JBL?
    I'm looking for JBL part no. 12441 (slide pot volume control part) of JBL SG520.
    Thanks a lot for your tips or information in...
  18. Replies
    2
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    1,065

    Thanks for your kind and detailed reply. I...

    Thanks for your kind and detailed reply.
    I tested two highly efficient JBL speakers (L101 & Olympus) with this preamp, but the hum was pretty much audible even with the volume all the way down....
  19. Replies
    2
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    1,065

    hum from speakers

    Hi friends,

    I've got a vintage JBL SG520 preamp in good working condition, but the only issue is the very audible hum from speakers when I hook it up to a power amp. Strange thing is when I hook...
  20. Replies
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    1,896

    Thanks for your feedback, grumpy. It's in like...

    Thanks for your feedback, grumpy.
    It's in like mint condition, though.
    Let me get back when I get the report from the tech.
  21. Replies
    10
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    1,896

    Today I put in the right fuse with correct rating...

    Today I put in the right fuse with correct rating (3/10AMP), but still it doesn't power up.
    Clearly there is another issue. What could it be? Any idea?
    Before I take it to the tech shop nearby, I'd...
  22. Replies
    44
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    6,974

    Thanks for your feedback. Yes, rug on the...

    Thanks for your feedback. Yes, rug on the hardwood floor, in your case. I was thinking of putting some wood boards on the carpet spot where the speakers are sitting, but when I looked at the bottom...
  23. Replies
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    6,974

    sound quality varies with carpet or hardwood?

    Hi friends,

    Currently my big vintage JBL speakers are sitting on the carpet in the basement, and I hear pretty good bass.
    Do you hear better (or worse) sound from your speakers on the carpet or...
  24. Replies
    10
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    1,896

    Yes, that slo-blo fuse, 3/10 amp. (as attached in...

    Yes, that slo-blo fuse, 3/10 amp. (as attached in the pic). And there is another fuse 1 amp fast blow (second pic) for a different purpose. Thanks so much for your valuable tip, JBL guru! :applaud:
  25. Replies
    10
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    1,896

    Thanks so much! :applaud: This is the way I learn...

    Thanks so much! :applaud: This is the way I learn from JBL guru like you.
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