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  1. Replies
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    I can't see what you're working with, but it's...

    I can't see what you're working with, but it's odd and rare that that many keys in a row would be bad. Can you post some pics? I've worked on lots of keyboards (not this one), and never had to order...
  2. You'll want to double check the bias since the...

    You'll want to double check the bias since the amp was designed for 6L6's and you have EL34's in there.
  3. 1K screen resistors are more commonly used on...

    1K screen resistors are more commonly used on EL34's and 470 ohm on 6L6's. Since you have EL34's in your amp......
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    I'd go to the source. You have to register, but...

    I'd go to the source. You have to register, but why not. That way you get updates, etc.

    https://www.tek.com/software/tekscope-pc-analysis-software#
  5. Just make sure you put it on right! I had a guy...

    Just make sure you put it on right! I had a guy bring in an amp that was blowing fuses once. He had put on one of those slide on ones oriented the wrong way. I didn't notice it right away and drove...
  6. A light bulb limiter would help here- instead of...

    A light bulb limiter would help here- instead of using a box of fuses.
  7. Tube QC isn't what it used to be. I wouldn't be...

    Tube QC isn't what it used to be. I wouldn't be surprised if you got a new defective tube. Try the new rectifiers one at a time to see if you can determine that one of them is bad. There's no problem...
  8. Also, when you replace parts and fire the amp up...

    Also, when you replace parts and fire the amp up for the first time, make sure your speaker(s) are disconnected in case you missed something and the amp is putting out DC voltage. Check the output...
  9. Welcome to the place! I'd bet my 1/4" nut...

    Welcome to the place!

    I'd bet my 1/4" nut driver that someone has taken the amp apart and reassembled it improperly. It's not likely Fender would have done that from the factory.
  10. A less than ideal impedance match is certainly a...

    A less than ideal impedance match is certainly a possibility. However, whether the tweeter is there or not shouldn't make much difference as far as output impedance. It has a crossover cap inline,...
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    I'd also check bias voltage and idle current....

    I'd also check bias voltage and idle current. Maybe bias is hot and flipping the switch sends it over the edge of the fuse rating.
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    Are you switching pentode/triode mode with the...

    Are you switching pentode/triode mode with the amp running? What is the mains fuse value?
  13. Yep. The old "One Wire" cascade mod.

    Yep. The old "One Wire" cascade mod.
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    I agree, g1. Since the amp works in triode mode,...

    I agree, g1. Since the amp works in triode mode, presumably with screens connected to plate, I can't think of a reason you would draw more current in pentode mode with screen resistors in circuit and...
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    Did the amp ever work, or is it a new build? In...

    Did the amp ever work, or is it a new build? In other words, is it possible something could be wired incorrectly?
  16. Thread: faceplates?

    by The Dude
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    Thanks for the tip mac. I just downloaded Front...

    Thanks for the tip mac. I just downloaded Front Panel Express. I'll give it a whirl at next opportunity.
  17. Thread: faceplates?

    by The Dude
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    157

    Has anyone tried 3D printing faceplates yet? I...

    Has anyone tried 3D printing faceplates yet? I have not, but I think it might work well. Maybe recessed text, etc.? I used to work for a company that built digital car dashes. The lenses were cut...
  18. ^^^^^^That. Plus,...... it would help to know...

    ^^^^^^That. Plus,...... it would help to know what amp we're modding. And FWIW, if I were adding a gain stage for the purpose of overdrive, I'd want a gain control. At a quick glance, I don't see...
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    I see a slot in the inner sleeve. Is it possible...

    I see a slot in the inner sleeve. Is it possible that the ground wire goes through that and makes it's connection by just getting sandwiched in the threads of the cap that screws on?
  20. When I click it says they have 3 in stock. ...

    When I click it says they have 3 in stock.

    Mouser has the same ones.
    ...
  21. These should work, also. ...

    These should work, also.

    https://www.audiolabga.com/mal_cart/mal_cart.php?find=VTL5C9&search_request_button=Search
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    I would have a look at solder connections on the...

    I would have a look at solder connections on the amp's input jack.
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    FWIW: I worked on one of those not too long ago...

    FWIW: I worked on one of those not too long ago with similar symptoms. It ended up not being the effects that were the cause. There was a shorted op amp on one of the inputs sending hash to the...
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    I've never cracked a part with freeze spray....

    I've never cracked a part with freeze spray. Regulators, processors, etc. can get hot. You could start with the finger test first. See what's getting hot.
  25. Try a 220 ohm sag resistor as suggested and see...

    Try a 220 ohm sag resistor as suggested and see what B+ voltage and idle current is. Tweak from there if necessary.
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    Sticky: Isn't there a "quick format" option?

    Isn't there a "quick format" option?
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    If there's no guitar signal getting through the...

    If there's no guitar signal getting through the amp, that actually makes it easier. Run a test signal through the amp and trace to the spot where you lose it. It's likely going to be the same spot...
  28. I'd just clean it up with a toothbrush and some...

    I'd just clean it up with a toothbrush and some WD40. If there's some rust left, so be it. At least the WD will help keep it at bay. The finish and everything else about the guitar has a well...
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