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  1. Thread: Rivera

    by DrGonz78
    Replies
    2
    Views
    47

    Call the guys over at Rivera and ask for it. They...

    Call the guys over at Rivera and ask for it. They are a great customer service oriented business and have helped me out multiple times before.
  2. So it's a single-ended amp. Much like a fender...

    So it's a single-ended amp. Much like a fender champ with an extra 12ax7 tube.
    54306
    54307
  3. Replies
    2
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    135

    From what I have heard is that it essentially a...

    From what I have heard is that it essentially a Fender Twin design. No schematic exists that I have seen but it might be out there. Look at this video for some gut shots. ...
  4. Replies
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    202

    Although this listing for a Valco made Montgomery...

    Although this listing for a Valco made Montgomery Wards amp model 9033 has the the look down perfectly!!
    https://reverb.com/item/5879028-vintage-1960s-montgomery-ward-valco-amp-model-62-9033

    Also...
  5. Replies
    5
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    202

    It seems to match the 1965 9023a found here...

    It seems to match the 1965 9023a found here pretty well...
    https://reverb.com/item/6618232-1965-airline-9023-a-supro-1624t-model-24-amplifier-w-1x12-jensen-original-vintage-amp
  6. Those boards are very difficult to work on and...

    Those boards are very difficult to work on and are just a real pita.
  7. Yeah I noticed it too but I thought it might have...

    Yeah I noticed it too but I thought it might have been the negative side that leads to the battery. Either it just looks like it's down there flopping in the wind.
  8. --- Relates to this picture here I believe......

    --- Relates to this picture here I believe...
    https://music-electronics-forum.com/attachment.php?attachmentid=46377&d=1228093104

    This was a quote from from 52 Bill from an old thread that looks...
  9. I would spray some contact cleaner on that bias...

    I would spray some contact cleaner on that bias pot, wiggle it around and then leave it where it was set originally. If it looks like a bad idea to move the bias pot around (it looks soldered in...
  10. Replies
    11
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    446

    I would keep grounding out the signal path...

    I would keep grounding out the signal path working your way towards the input. Since grounding out the return jack muted the noise you might find a point in the signal path where it doesn't mute the...
  11. Replies
    15
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    793

    Typical we really only need a light bulb limiter...

    Typical we really only need a light bulb limiter if the amp is blowing fuses. I don't think you ever mentioned a fuse blowing situation. I understand the feeling to add protection with the limiter in...
  12. Replies
    15
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    793

    Yup if the amp is not blowing fuses then get the...

    Yup if the amp is not blowing fuses then get the light bulb limiter out of the mix. Did this strong hum go away after replacing C35? Check your power supply rails and check the speaker output leads...
  13. Replies
    15
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    793

    So what D.C. Offset are we seeing on the speaker...

    So what D.C. Offset are we seeing on the speaker leads now? Still 5vdc or was that measured before replacing c35?

    Also when you say rise volume up: are you simply turning the volume up with the...
  14. Isn't there something you could have the...

    Isn't there something you could have the customers sign when they drop off the amp? Before learning amp repair I used to take my amps to a field service repair shop. You would sign for an estimated...
  15. Thread: Tube tester

    by DrGonz78
    Replies
    13
    Views
    626

    Looking at the new picture that wire looks like...

    Looking at the new picture that wire looks like much thinner gauge wire than it did in the original picture. Weird. Is it stranded wire and lots of strands broken off? Yup light bulb 💡 limiter is a...
  16. Replies
    15
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    793

    Is the 5 volts negative or positive voltage? Do...

    Is the 5 volts negative or positive voltage? Do you have a diode setting on your multimeter? Have you checked the part with a meter? Keep the speaker disconnected for now since DC voltage can damage...
  17. Thread: Tube tester

    by DrGonz78
    Replies
    13
    Views
    626

    That white wire appears to be thin but appears to...

    That white wire appears to be thin but appears to be solid core wire. It's not like a tiny strand of wire and is probably pretty strong in actuality. Looks like it is supposed to be soldered into the...
  18. I would measure for AC ripple at C18 and C21 just...

    I would measure for AC ripple at C18 and C21 just to be sure. The preamp section has another 100uf filtering stage on the power supply. If your meter has trouble measuring AC ripple effectively you...
  19. What type of voltmeter are using? Since you know...

    What type of voltmeter are using? Since you know already to check the current (voltage) across those resistors it tells me you have probably checked this before on other amps. So I assume it's...
  20. The output section on this amp looks like a quasi...

    The output section on this amp looks like a quasi complementary type which has two npn transistors instead of a pnp/npn pair. As I recall the DC offset with a quasi complementary output can measure...
  21. Be careful making sure the Gibson night light is...

    Be careful making sure the Gibson night light is authentic or they might come after you!!
  22. Saw this the other day. "Uses real amp...

    Saw this the other day. "Uses real amp materials". I think I like the tube night light better. ...
  23. Replies
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    4,509

    If the manufacturer doesn't supply a board layout...

    If the manufacturer doesn't supply a board layout then I don't think you will find it.
    https://supportloudtech.netx.net/file/asset/1375/original/attachment
  24. Thread: Crate TD-70

    by DrGonz78
    Replies
    18
    Views
    5,819

    The server had a crash a few years back and some...

    The server had a crash a few years back and some files were corrupted, this is one of them. Here is a reupload... Also I wouldn't recommend leaving your email in public forum as you might attract...
  25. Replies
    16
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    324

    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.
  26. Replies
    15
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    793

    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...
  27. Replies
    16
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    324

    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...
  28. Replies
    63
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    1,381

    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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