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  1. Replies
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    Primary is shown as left side of T2. To reverse...

    Primary is shown as left side of T2. To reverse primary swap wires at J1 & J3.
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    Checked mine and reading is 1.9Meg so this is a...

    Checked mine and reading is 1.9Meg so this is a good clue.
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    198

    Without getting too controversial here (with even...

    Without getting too controversial here (with even higher numbers), if supply is adequate you can even get 60W from a pair of 6L6GC.

    Pulling a pair of tubes from a 100W amp (and adjusting load...
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    207

    Also, you mentioned cleaning the speaker jacks on...

    Also, you mentioned cleaning the speaker jacks on the amp but didn't say if you examined the solder connections.
    It's possible unplugging/plugging the speaker cable temporarily restored an...
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    Also looks like the wrapper on that cap has...

    Also looks like the wrapper on that cap has shrunk (from heat probably)? I don't see it partially wrapping over the top like the other cap in the pic.
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    Not on air. I tried that once & learned pretty...

    Not on air. I tried that once & learned pretty quick.
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    Agree that they are a retailer and don't seem to...

    Agree that they are a retailer and don't seem to know what they are talking about. :D
    My take was that they said EL34B was 30W not 25W like the EL34A so maybe they were thinking the extra watts...
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    198

    Yes, I think the business about the grid...

    Yes, I think the business about the grid resistors for the power tubes would be at least easier to contemplate if we even knew what kind of PI arrangement was being used.
  9. Please post the schematic you are speaking of. ...

    Please post the schematic you are speaking of. There are several and we need to be talking about the same one.
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    If you haven't verified a fault in either speaker...

    If you haven't verified a fault in either speaker cable, then it is probably just a coincidence that the fault occurred at the same time you swapped cables.
    You will have powered down to change them...
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    If schematics have been posted elsewhere, please...

    If schematics have been posted elsewhere, please post them in this thread.
    Without schematics, I don't think anyone will be able to explain the arrangement to you so you will have to draw some up.
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    It's a little different from the V4B here. (+)...

    It's a little different from the V4B here.
    (+) setting puts C102 as bright cap across volume.
    Neutral setting puts C101 & C102 in series but shorts the 2 ends together. However it is still...
  13. Thread: VU meter in Akai M8

    by g1
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    107

    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.
  14. 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.
  16. 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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