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    I recently did a 4311b overhaul. To remove cover...

    I recently did a 4311b overhaul. To remove cover plate (foilcal) you use a hair dryer and thin putty knife blade or scrapper and work slowly. It may take a good 15 to 20 minutes to get the adhesive...
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    Keeping them in the family

    I thought that I should follow up and thank everyone for their help. Jbl4ever was very helpful in posting the service manual, which clearly shows that removing the foilcal is required. And...
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    Hi Pyonc Looking through the manual, your amp...

    Hi Pyonc
    Looking through the manual, your amp has two fuses. Since, you are living in the state of Maryland. I can assume that you are running this amp with 115 volts. So, the 3/10AMP fuse is...
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    JBL 4311B Restoration Questions?

    I have a pair of JBL 4311B speakers that are in pretty good condition.
    But, I need to replace the L-Pads. And while I am at it, I plan on replacing the capacitors as well.
    And the grill cloth has...
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    Hi The box appears to be home made and nicely...

    Hi

    The box appears to be home made and nicely built.
    But, before you reinstall the drivers, you should measure the inside dimensions and size of the port.
    To me, the port looks too large.
    So,...
  6. If you can't find a coil with the required...

    If you can't find a coil with the required inductance value then order a coil with a slightly higher inductance value and then remove a few windings from it. But, it will require you to have an...
  7. Your D-45 should be like the D-75A, and...

    Your D-45 should be like the D-75A, and converting the amp from stereo mode to bridged mono is not a big deal. In the case of the D-75A, there is a small PC board pin “jumper” that must be moved and...
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    You could add a Balanced Line Receiver chip...

    You could add a Balanced Line Receiver chip before the first TL072 and a Balanced Line Driver chip after the second TL072.

    Links to some very fine balanced line chips:
    ...
  9. Hi Ed There are multiple versions of WinISD on...

    Hi Ed

    There are multiple versions of WinISD on the linearteam web site.

    And some versions work better than others.

    I have found that the older versions don't work well on the Windows 7.
    ...
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    Hi Rob Wow, you are hitting, your project with...

    Hi Rob

    Wow, you are hitting, your project with a lot more design tools than I used for port tuning a project. Of the two most popular tools, of course I am referring to WinISD and Bass Box 6. I...
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    Hi Rob A sealed enclosure has only one...

    Hi Rob

    A sealed enclosure has only one impedance peak and a bass reflex enclosure actually has two impedance peaks, with one peak above and the other peak below the port tuning frequency. A valid...
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    Wow, I am having second thoughts. And I hate to...

    Wow, I am having second thoughts. And I hate to have to say this. But, I really don’t think you have enough knowledge and experience working with electronics to safely test and possibly service your...
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    Hi Pyonc Well, maybe I am not very clear in my...

    Hi Pyonc
    Well, maybe I am not very clear in my explanations. Fundamentally, we are testing to see just how much DC voltage would be going to the speakers when no input signal is present. So, the...
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    Hi pyonc Rather than respond to your private...

    Hi pyonc

    Rather than respond to your private email, I thought it might be better to post to the thread, as more people may benefit from it.
    The Fluke multi-meter is the correct tool for the job....
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    After reading the JBL service manual, as long as...

    After reading the JBL service manual, as long as the DC voltage is below +/- 0.1 volt the amplifier is OK. And a little thump is not a problem. But, if you measure a higher DC voltage than it is time...
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    Hi pyonc Yes, the thump does have to do with it...

    Hi pyonc
    Yes, the thump does have to do with it being a “T-Circuit” amplifier. You can think of the “T-Circuit” as being a discreet component version of a modern integrated circuit op-amp. It is...
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    Hi I did a quick google search and I could not...

    Hi

    I did a quick google search and I could not find the JBL SA640 schematic. But, I did turn up the service manual for the SA600 and SA660 amplifiers, which should be very similar to the SA640....
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    I agree the manual looks very blurry. But, to me...

    I agree the manual looks very blurry. But, to me the font looks to be Italic. So, what appears to be a “7” could very well be a “T” instead. And my google searches do not turn up any 71084 or 7L084...
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    Yes, the N2400 network with a 1.0 mH coil is...

    Yes, the N2400 network with a 1.0 mH coil is designed for a 8 ohm woofer (D130) and a 8 ohm bullet tweeter (075 = 2402). :yes:
  20. Hi Over the years, I have owned several crown...

    Hi
    Over the years, I have owned several crown amps. The first being a Power-Tech 1, my impression of the Power-Tech 1 was that it was designed for DJ systems and while it had a very clean sound. The...
  21. Hi The period correct crossover for the LE14A &...

    Hi
    The period correct crossover for the LE14A & LE175DHL drivers is the LX10.
    What you end up with is the S1 system.
    Here are the links to the S1 system and the LX10 network:
    ...
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    Actually, the D123 has a higher power rating of...

    Actually, the D123 has a higher power rating of 50 watts. But, I suspect that if you really push it over the cliff. You could still blow it up.

    Nigel: "You see, most blokes will be playing at 10....
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    61107 For speaker wire I use 12-gauge 2...

    61107
    For speaker wire I use 12-gauge 2 conductor landscape lighting cable.
    You can get about 100 feet of it for about $60.00.
    So, it's not overly expensive.
    Baron030:)
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    Hi One picture can say a thousand words. So, I...

    Hi
    One picture can say a thousand words. So, I used Microsoft Paint modify one of your pics.
    Hope this helps.

    61095

    Baron030:)
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    Hi I know the JBL part #10285 L-Pad has an 8 ohm...

    Hi
    I know the JBL part #10285 L-Pad has an 8 ohm resistance and a 15 watt power rating. So, I think there is a typo in the L36 Schematic, it’s not 5 watts. And as far as shaft length go, I would...
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