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  1. Thread: VU meter in Akai M8

    by g1
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    Yes, low ohms. One of the old radios I worked on...

    Yes, low ohms. One of the old radios I worked on had a meter in series with power supply feed for one of the stages. Bypassed the dead meter with a wire and the radio worked again.
  2. If not 'silver-mica disease', this is an...

    If not 'silver-mica disease', this is an interesting read anyway: https://www.antiqueradios.com/forums/viewtopic.php?t=61153
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    In your diagram you called lug #2 the tip. Lug...

    In your diagram you called lug #2 the tip. Lug #3 is the tip. #2 is the switch. So #3 should only measure grounded when no plug inserted.
  4. Yep. Many of us have seen vintage Fender front...

    Yep. Many of us have seen vintage Fender front panels bent instead of the jacks breaking. That is a lot harder to fix.
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    Yes, that is how the screen supply was...

    Yes, that is how the screen supply was configured. In the other thread, I had mentioned that judging by the size (power) of those resistors they were probably pulling the whole B+ down somewhat and...
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    Here it is, I haven't checked whether she still...

    Here it is, I haven't checked whether she still has the sound files up or not: https://music-electronics-forum.com/showthread.php?t=49862&p=541721&viewfull=1#post541721
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    The V4B does not have the sensitivity switch so...

    The V4B does not have the sensitivity switch so it has less gain in the first stage. If you have the sensitivity on the V4 set to -9db then you can compare the two models as far as the volume...
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    Those blue bits to the screens look like...

    Those blue bits to the screens look like wirewound power resistors to me. Double check resistance with your meter and closely inspect for any markings.
    As described, they form a voltage divider to...
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    Yikes. Glad you're still here. Is there even...

    Yikes. Glad you're still here.
    Is there even anybody to report such things to?
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    I think the 'bad service' comments were about the...

    I think the 'bad service' comments were about the TX rewind he had done.

    (P.S. Nice to see you drop by Hodgy! Sounds like you are with Yamaha now. :) )
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    Not sure if this is the problem but if you have...

    Not sure if this is the problem but if you have the sensitivity switch set on 0db it is fairly easy to overload the first stage which is pre volume control. Someone who likes a real clean sound may...
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    Just want to make sure this has been done. ...

    Just want to make sure this has been done. Boroman, I know you said you "checked/changed" preamp tubes, I want to verify they are not being checked on a tube tester and put back in the same spots.
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    The funny thing is, if you want to go for 6550's...

    The funny thing is, if you want to go for 6550's you will have to cut the bear trap style stock retainers off. ;)
    So that's another reason to go for the spring type. I can understand wanting to...
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    That will be different for each application. ...

    That will be different for each application. That's why it's easiest to post them so they can be analyzed here.
    The only general statement I can make about 'normal' is that there will be around .5...
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    Cleaner version of schematic:

    Cleaner version of schematic:
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    Also, without touching the sensitivity switch,...

    Also, without touching the sensitivity switch, what resistance do you measure from V1 pin 8 to ground.
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    One very important thing you have not told us is...

    One very important thing you have not told us is what setting you have the 'sensitivity' switch on (above the volume pot).
    I just had to replace C2 in my spare, I have it open if we need to verify...
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    Search for heatsink for output IC rather than...

    Search for heatsink for output IC rather than specifically the LM1876.
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    For the voltage measurements you measure each pin...

    For the voltage measurements you measure each pin to ground. So leave black probe connected to ground and check at E,B, and C.
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    You are supposed to mount on a heatsink. That's...

    You are supposed to mount on a heatsink. That's not uncommon for these kind of kits at that price.
    My worry would be whether the power chip is authentic. Even so, I'm sure they work, and your...
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    I have no idea how good this machine would be or...

    I have no idea how good this machine would be or if the price is reasonable, but just passing on a link I came across elsewhere:
    ...
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    I just assumed they were using a MBB type switch...

    I just assumed they were using a MBB type switch there. ;)

    Seriously though, I did notice your valid statement with regard to the switch. :) Some of us may get a bit of 'tunnel vision' in terms...
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    Yes. But when you put them back into the board,...

    Yes. But when you put them back into the board, they will no longer give the same readings on diode check. That is normal.

    To see what they are doing in circuit, you really need to power up the...
  24. I'd get it running (if transformers ok) and use...

    I'd get it running (if transformers ok) and use it with pedals if you find it sounds too flat.
    Start with checking power supply and tube DC voltages.
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    I think you are talking about testing the...

    I think you are talking about testing the transistors with diode check in circuit but unpowered.
    If so, you can not expect them to test the same as out of circuit.
  26. I hate to say it, but I'd try it with TR1...

    I hate to say it, but I'd try it with TR1 removed. If the Led still won't go off, you may have some board leakage.
    But if you see any residue around, clean it up with isopropyl and try again before...
  27. Can you post the emitter and collector voltages...

    Can you post the emitter and collector voltages for TR1 with channel off and on?
  28. If you are still on the bulb limiter you can't...

    If you are still on the bulb limiter you can't expect the numbers that are called out on the schematic. Was the protect bulb ever lit while on the bulb limiter?
    Do you have the speakers...
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