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  1. Replies
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    Possible that the wire running from the emitter...

    Possible that the wire running from the emitter to the pcb was a fix due to a cracked transistor leg.
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    The amp schematic shows that the headphones jack...

    The amp schematic shows that the headphones jack is actually in parallel with the speaker output jack connections. So that would make me think that anything you hear out of the speaker then would be...
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    ERS is a replacement parts company just like ECG...

    ERS is a replacement parts company just like ECG or NTE. Looking at this ebay listing it shows "1 Piece | 2SC2773 Sanken NPN Transistors Equiv: NTE58 ECG58" in the items description. ERS58 should be...
  4. Thread: Steve

    by DrGonz78
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    Sadly I even remember one of his last posts...

    Sadly I even remember one of his last posts saying something about how he should be focusing on his health and instead was dealing with a thread involving those idiot trolls who came here about a...
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    None of the legs of the bridge rectifier should...

    None of the legs of the bridge rectifier should have a connection to the metal base. Get out your meter and check to see. Just different heat sink potential.
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    I am assuming that the circuit board picture was...

    I am assuming that the circuit board picture was before you re-flowed any questionable solder joints.

    Edit: it's sometimes tough to tell in photos but some of those joints look like they need a...
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    Well first things first, mine is actually not a...

    Well first things first, mine is actually not a Marlboro G60R but rather a 560A model. You can see that the Hohner CA-12R model which is pictured early in this thread had different arrangement of...
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    You build a light bulb limiter so it will,...

    You build a light bulb limiter so it will, hopefully, stop blowing fuses. No point powering it up without the light bulb limiter as that will only blow more fuses and possibly keep destroying more...
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    I have to wonder if this squealing has anything...

    I have to wonder if this squealing has anything to do with the input jacks. Have we cleaned them and ohmed out the contacts to make sure they are closed? When we are inputting the signal is it into...
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    I believe it is the 1458 by going by the pictures...

    I believe it is the 1458 by going by the pictures he uploaded. I had that same thought about the 1458 being swapped with a 4558.
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    I still have the amp but I need to dig it out of...

    I still have the amp but I need to dig it out of my storage area. This might get me to finally change the speakers (really cracked up cones) and sell the thing. In the next couple of days I will take...
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    There is one thread on mylespaul website where...

    There is one thread on mylespaul website where someone matched component values and rewrote out the schematic of the original 5005 lead 12 amp. See post #57. Not sure this is any help but just...
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    I am thankful every time someone initiates a...

    I am thankful every time someone initiates a thread that gets the group here troubleshooting. This website represents a wealth of information detailing so many different faults and resolutions to...
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    Well if it is 100hz hum I would check for AC...

    Well if it is 100hz hum I would check for AC ripple, suggesting a leaky mains filter cap. I would think a ground loop would be a 50hz hum. In the US we have different mains voltage so it is 120hz DC...
  15. I went straight to parts is parts website and...

    I went straight to parts is parts website and searched for the jack when I first read your post. Funny thing is that they have the listing for the part as "Vox speaker Jack for NT15H, 530000001452"...
  16. If the circuit boards end in -00, like Soulfetish...

    If the circuit boards end in -00, like Soulfetish thought, then they must be older jcm 2000 models. Probably had 1000's of hours of use and just cooked the connections. The other one that springs to...
  17. Which exact model of jcm 2000 was it? Can you...

    Which exact model of jcm 2000 was it? Can you date the amps?
  18. To me it looks like those burnt up resistors are...

    To me it looks like those burnt up resistors are probably dropping resistors for the lower voltage preamp supply. D10 & D9 appear to burnt up a bit too and it would not surprise me if those diodes...
  19. Well I have not worked with red tolex and...

    Well I have not worked with red tolex and probably would have used a black sharpie when measuring to cut. So thanks for the heads up warning. 👍
  20. I remember first working on amplifiers with live...

    I remember first working on amplifiers with live voltages as something that made me very nervous. What made me less nervous is the act of doing it more and more over time. What I recommend before...
  21. Sometimes you fix the gear and in certain...

    Sometimes you fix the gear and in certain circumstances the gear gives you a fix. Imagine the scientist Albert Hofmann's trip when he accidentally discovered lsd for the first time.
  22. That's a trip!!

    That's a trip!!
  23. I wouldn't consider 300vdc to be a non-lethal...

    I wouldn't consider 300vdc to be a non-lethal voltage. I was wondering what voltages the OP had in mind.
  24. So what is the desired b+ plate voltage for this...

    So what is the desired b+ plate voltage for this project? Have to ask why non-lethal voltage is a factor of the design idea? I guess you want to see if it can be done and if it might sound unique.
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    I refer to older technology as a romantic era....

    I refer to older technology as a romantic era. You open an old amp and the smell of vintage is quite appealing. This new era of technology is the throw it away era and the smell is not so sweet.
  26. Can I throw a curve ball into the question?...

    Can I throw a curve ball into the question? Ceramic insulators???

    https://jimsaudio.com/ceramic-insulator-plates-4-pieces-for-to-3-good-heat-conductiviy/
  27. Actually when I first looked at the picture I...

    Actually when I first looked at the picture I only saw the baby at first. Then a few seconds later my eyes focused on the mother lastly. Pretty cool!!
  28. Just like that owl showing only 1 eye I am...

    Just like that owl showing only 1 eye I am legally blind in my right eye too. Very cool picture as well G1!!

    I got a picture to show. So I finally got to rewire another one of these (ON | OFF |...
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