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  1. Replies
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    4.7k = 5k = same thing. You removed the rest of...

    4.7k = 5k = same thing. You removed the rest of the circuit in your drawing. Look at the original, it had a 5k pot at the bottom of the cathode circuit - the presence control. Replace the control...
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    Don't be afraid of the scope. Really all it is...

    Don't be afraid of the scope. Really all it is is a voltmeter on a screen, a visual voltmeter. As the voltage you are probing changes, the line moves up and down. So you use it like a volt meter....
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    Agree, the red plating tubes probably blew the HV...

    Agree, the red plating tubes probably blew the HV fuse.
  4. I have no reason to suspect the special diode...

    I have no reason to suspect the special diode unless something specifically points to it as the failure.

    I agree often shorted outputs is as far as it goes... but not always.

    Shorted output...
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    235

    I almost said something on that earlier. Is this...

    I almost said something on that earlier. Is this a Hot Rod DeVille or a Blues DeVille? The original Blues DeVille had no adjust, but the re-issue Blues DeVille does, as do the Hot Rods.

    Perk,...
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    I don't know who else might have done it, but I...

    I don't know who else might have done it, but I don't see it as a mistake. Note the OT is wired with C (common), 4 8, and 16 ohm taps. The speakers themselves do not reference to ground. You are...
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    Pin 5 of the power tube sockets MUST have bias...

    Pin 5 of the power tube sockets MUST have bias voltage roughly -50v.
  8. Did you just test for continuity, or did you test...

    Did you just test for continuity, or did you test for resistance?

    I am not a fan of replacing lots of parts. The LED is lit by current through it, the current is controlled by the transistor. ...
  9. Replies
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    There is a test point on the corner of the socket...

    There is a test point on the corner of the socket board, factory setting is 60mv. What does yours read? And did you adjust it with each set of tubes?
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    He asked this elsewhere, and I suggested that the...

    He asked this elsewhere, and I suggested that the trem coming and going sounded more like a failed connection to me.
  11. Replies
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    I am also in my 70s, and I do enjoy cheesecake,...

    I am also in my 70s, and I do enjoy cheesecake, at least the eating kind. (Make your own double entendre)

    I just stuck with the plain blue with lit window that came with Windows 10.

    Left on my...
  12. Replies
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    Hi Jimmy. I am glad this old thread was...

    Hi Jimmy. I am glad this old thread was helpful, but please start a new thread for your amp. It gets confusing when more than one repair is in the same thread.

    If function comes and goes it...
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    The signal is present on all the taps whether you...

    The signal is present on all the taps whether you use the tap or not. NFB is taking the output signal and feeding it back. The different taps have of course different levels of signal. They chose...
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    Also, connect a different speaker to it and try. ...

    Also, connect a different speaker to it and try. A broken tinsel wire on a speaker, or a rubbing voice coil could do this.
  15. I only see the pics in post #2, and the empty...

    I only see the pics in post #2, and the empty small xstr spots look to me to have the B in the center. Are they TO92 or are they round ones?
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    I got nothing against rebranding. I knew when I...

    I got nothing against rebranding. I knew when I bought SOvtek or JJ or Chinese tubes from Ruby that they were burned in and tested, plus they warrantied them.
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    Yup, Fender doesn't make tubes, they buy them...

    Yup, Fender doesn't make tubes, they buy them rebranded from a number of suppliers.

    I was under the impression that TAD was like Ruby/Magicparts, they don't make tubes either. I thought they sell...
  18. Thread: B&K 440 CRT

    by Enzo
    Replies
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    84

    It is a picture tube tester...period. It checks...

    It is a picture tube tester...period. It checks CRTs from TV sets, video monitors, and the like. it will test them, and can rejuvenate them. The electron guns weaken over time, the image gets dim....
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    Seriously, call them anyway, they may know...

    Seriously, call them anyway, they may know exactly which tweeter they carry matches.
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    I recommend you CALL them on the phone, unless...

    I recommend you CALL them on the phone, unless you see what you need right away. Most places have more stock than what shows online. And they may have cross references that are not online.
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    Or take the materials to a reconer and have them...

    Or take the materials to a reconer and have them do it. I never reconed them myself, I always relied on an honest to god JBL reconer.
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    Well, not a piezo anyway. Try the link from...

    Well, not a piezo anyway.

    Try the link from nosaj.
  23. How would more voltage make the LED go off? ...

    How would more voltage make the LED go off?

    One LED (Green LED1) shares current with two relays, so the voltage is naturally dropped before the LED. I don't know from channels, can we refer to...
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    Here is the board layout

    Here is the board layout
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    You can turn the amp on without tubes for various...

    You can turn the amp on without tubes for various tests, but you cannot operate the amp with any tubes removed. The three small tubes are wired parallel heaters, and that is in the series wiring...
  26. Like a "57 Chevy, with a new crate motor...

    Like a "57 Chevy, with a new crate motor installed, a different tranny, and a rear end for dragging. it is still a "57 Chevy, it just isn't stock. Your amp is from whenever it was built, just it...
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    So none of the parts were ever bad?

    So none of the parts were ever bad?
  28. Replies
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    How about a photo or two of the tweeter, and the...

    How about a photo or two of the tweeter, and the numbers printed on it, rather than the Roland stock number. Thanks for the Roland number, but it doesn't identify it generically.

    It is either a...
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