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Thread: Help Marshall vs65r

  1. #211
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    Yeah I know i was just asking for educational purpose
    Last edited by AL78; 03-19-2017 at 04:03 PM.

  2. #212
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    Quote Originally Posted by AL78 View Post
    So to be clear that's the right pin number?

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    Yeah, that's right.

  3. #213
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    Ok So if the tube was good How much AC should I get on pin 1?

  4. #214
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    Quote Originally Posted by AL78 View Post
    Ok So if the tube was good How much AC should I get on pin 1?
    About the same as is on pin 2.
    Experience is something you get, just after you really needed it.

  5. #215
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    so pin 1 is connected with r 19?

  6. #216
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    SO guys I've removed the tube is so we can check the pinout.Is that 1 or 9?I think the picture I've gave you before was confusing

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    Quote Originally Posted by Dave H View Post
    Yes, I've marked up the pins below.

    Attachment 42815
    So I was right The first pinout I gave It's right.The one that is connected with r19 is pin 1 and than counterclockwise 2 3 etc.The Tube is installed upside down.anyway I've post a pic without the tube so we can be shure.Anyway in any case we don't have 89v AC on either of the pin whatever count we agree on :-D.So I've just find out that a music instrument close to my home has the Ecc83 10 euro.I'll call tomorrow to be sure It's available and then I'll try with a new tube.

  8. #218
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    Quote Originally Posted by AL78 View Post
    So I was right The first pinout I gave It's right.The one that is connected with r19 is pin 1
    No, I screwed up and got the anode and cathode swapped

    Sorry about that. I've deleted that post. The correct (I hope) pinout is below.

    Do you have 89V AC on pins 2 & 6 but not on pin 3?

    vs65r-v1-pins-2.png

  9. #219
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    Listen Have you checked the pic with notube just the socket?So I've found this
    http://tubes-store.com/images/6n2p_rewire.jpg

    that's exactly how I have list my pinout(12ax7)

  10. #220
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    Quote Originally Posted by AL78 View Post
    Listen Have you checked the pic with notube just the socket?
    I have now. I didn't know where it was at first. The arrow points to pin 1.

    I hope my post above in now correct. I'm having trouble flying the forum software. Sorry for the confusion.

  11. #221
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    ok now it's clear(at least for me) if that's number 1 the pin nickb gave us it's right.And again anyway I only have 89v AC on 2 points so i think the tube is bad I'll try to buy it tommorow thanks

  12. #222
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    Quote Originally Posted by AL78 View Post
    ok now it's clear(at least for me)
    Careful

    OK, Just to be clear (for me). There should be the same AC voltage on pins 2,6 and 3. If there's no AC on pin 3 set your meter to DCV and measure the DC voltage on pin 3. It should be close to the DCV on pins 2 and 6.

  13. #223
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    I think we have already checked for DCV with nickb but I'm not sure.Anyway since we have established that the tube is gone I'll buy it and will go from there

  14. #224
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    I did look for the DCV measurements but didn't find them and we weren't sure of the pins. If there's no DC in the pin 1,2,3 triode it could be the valve but it could also be a bad connection. Pin 1 open circuit for example (pin 1 should be a high DCV)

  15. #225
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    I'm pretty sure we checked DCV.And also I've checked all pin on the tube.I rember high DC voltage like 100 or so dc that's why nickb told me to buy the cap to check the ac otherwise my multimeter wouldn't read the AC

  16. #226
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    Quote Originally Posted by AL78 View Post
    I'm pretty sure we checked DCV.And also I've checked all pin on the tube.I rember high DC voltage like 100 or so dc that's why nickb told me to buy the cap to check the ac otherwise my multimeter wouldn't read the AC
    Yes,we did check the DCV way back. They were in the right area. I was concerned that pin 3*** was 200V, higher than I'd like to see as that is right at the limit of the heater-cathode spec.


    *** not pin 1 as I first wrote.
    Last edited by nickb; 03-19-2017 at 08:28 PM.
    Experience is something you get, just after you really needed it.

  17. #227
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    Quote Originally Posted by nickb View Post
    Yes,we did check the DCV way back. They were in the right area. I was concerned that pin 1 was 200V, higher than I'd like to see as that is right at the limit of the heater-cathode spec.
    Nick, unless I've got it wrong (again) pin 1 is the anode of the cathode follower so it will be at B+ voltage.

  18. #228
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    Quote Originally Posted by Dave H View Post
    Nick, unless I've got it wrong (again) pin 1 is the anode of the cathode follower so it will be at B+ voltage.
    Of course. Thanks. I had a brain fart and then confusion ensued...

    Pin 3 is the cathode (and that is what is connected to R19).

    Here a drawing of what I believe we have established the pinout to be:

    vsr65.jpg
    Experience is something you get, just after you really needed it.

  19. #229
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    Guys thank you a lot for your help I really hope the store email me back tomorrow so I will soon get the tube.I have two questions one is general about this testing and one is just a curiosity.
    1) since we find out that the problem should be the tube(I hope),there is any test that we can do in the tube socket just to be sure that there is no short?
    2)Second question if I had and oscilloscope all this AC testing would go easier right?

    P.s.
    If I make grammar mistakes if you want you can correct me I won't get offended,actually I will be glad unfortunately I don't have lost of occasion to use my english
    Last edited by AL78; 03-19-2017 at 09:44 PM.

  20. #230
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    Quote Originally Posted by AL78 View Post
    Guys thank you a lot for your help I really hope the store email me back tomorrow so I will soon get the tube.I have two questions one is general about this testing and one is just a curiosity.
    1) since we find out that the problem should be the tube(I hope),there is any test that we can do in the tube socket just to be sure that there is no short?
    As the DCV are OK we know the socket is good. If there were a short it would have to be an AC path i.e. through a capacitor to ground. I don't see that as a real possibility.

    2)Second question if I had and oscilloscope all this AC testing would go easier right?
    An oscilloscope will give your more information. I don't think it would have made any difference in this case.

    P.s.
    If I make grammar mistakes if you want you can correct me I won't get offended,actually I will be glad unfortunately I don't have lost of occasion to use my english
    I really don't think there is any need for an apology. There might have been a few misunderstandings along the way but I've seen much worse. Anyway, I can't speak a word of Italian. Once, I was on a job in Italy so some of the native speakers were trying to teach me a few words. I exhausted them as despite their persistent efforts I just could not get the pronunciation anywhere near correct,
    Experience is something you get, just after you really needed it.

  21. #231
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    Next time just move frantically your hands.I always say that first you need to understand how to move your hans than your talk
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  22. #232
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    Quote Originally Posted by AL78 View Post
    Next time just move frantically your hands.I always say that first you need to understand how to move your hans than your talk
    So that's where I've been going wrong is it? The usual English way is to just talk English is a slow loud voice and expect the whole world to understand.

    I've been to Italy a few times but only as far south as Pisa. If I ever get to Sicily I want to stay in Montalbano's house. I loved that series.
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  23. #233
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    Guys I've just get the new tube.Unfortunately nothing changed even the value on all pins are the same no ac(almost) on r19.now what?

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    Quote Originally Posted by Dave H View Post
    So that's where I've been going wrong is it? The usual English way is to just talk English is a slow loud voice and expect the whole world to understand.

    I've been to Italy a few times but only as far south as Pisa. If I ever get to Sicily I want to stay in Montalbano's house. I loved that series.
    I'll bring you there It's like 2 hours from where I live.Last month they've just show 2 new episodes on national tv.That series it's very popular here too.

  25. #235
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    Quote Originally Posted by AL78 View Post
    Guys I've just get the new tube.Unfortunately nothing changed even the value on all pins are the same no ac(almost) on r19.now what?
    You have to be kidding me..

    In that case
    (1) Do you still have 86VAC or so on pins 2 and 6?
    (2) Recheck the DCV on R19 - it was about 200V

    If those are OK then the new tube could be bad (it happens) or something is AC loading pin 3 but hard to imagine what unless some changes have been made in that area.
    Experience is something you get, just after you really needed it.

  26. #236
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    Everything is the same i have 181v on r19.

  27. #237
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    You've checked both sides of R19, just in case you're measuring the wrong side?

    That being OK I'd unsolder and lift to disconnect one lead of R42, C41, R48 and C51. That should isolate the cathode of the tube from everything else.
    Experience is something you get, just after you really needed it.

  28. #238
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    Quote Originally Posted by AL78 View Post
    Next time just move frantically your hands.I always say that first you need to understand how to move your hans than your talk
    Quote Originally Posted by Dave H View Post
    So that's where I've been going wrong is it? The usual English way is to just talk English is a slow loud voice and expect the whole world to understand.

    I've been to Italy a few times but only as far south as Pisa. If I ever get to Sicily I want to stay in Montalbano's house. I loved that series.
    Not at random, each sign has a specific meaning, but donīt worry, hereīs a 10 minute course:


    FWIW and being Argentine, I know and use all of this since I was about 2 or 3 y.o.
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    Juan Manuel Fahey

  29. #239
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    so one side is 183v other side is almost 0 volt.So after I unsold those what I have to do next what kind of measure?
    Last edited by AL78; 03-20-2017 at 08:59 PM.

  30. #240
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    those gestures are perfect,there are some but I would say are regional

  31. #241
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    Is it like still this?

    9 0.009v Heater
    8 0,914v Cathode A
    7 2.397v Grid A
    6 92.4v Anode A
    5 6.40v Heater
    4 6,10v Heater
    3 0.054v Cathode B
    2 92.4v Grid B
    1 0.015v Anode B

    What's the DC voltage on pin 1?

  32. #242
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    dc voltage on pin 1(considering the image from the top of this page) is 352dc

  33. #243
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    Quote Originally Posted by AL78 View Post
    so one side is 183v other side is almost 0 volt.So after I unsold those what I have to do next what kind of measure?

    After doing that we will measure the ACV on pin 3. The purpose is to test the tube in isolation, as far as possible.

    Sorry for slowish responses here, I've stopped getting email update notifications for some reason.
    Experience is something you get, just after you really needed it.

  34. #244
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    Quote Originally Posted by AL78 View Post
    so one side is 183v other side is almost 0 volt.So after I unsold those what I have to do next what kind of measure?
    Here is something else I just thought of to check first that I had overlooked. Turn off and check the resistance of R19. If it is open it would cause the same symptom.
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    Experience is something you get, just after you really needed it.

  35. #245
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    Ok I'll let you know as soon I have done everything.Question Can I disconect those parts completily?I think it would be easier for me,I mean I'll try to disconect just one side but in case I have problem Can i remove them completely?
    About r19 can I check it on the board or I have to disconect one side too?
    Thanks for everything

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