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    Speakers are DEFINITELY the most overlooked...

    Speakers are DEFINITELY the most overlooked component in the tone game. And even at that there are a thousand options out there. I actually goaded tboy to start the "Trade Tent" branch of this forum...
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    I've never seen shielded OT leads. And, you said...

    I've never seen shielded OT leads. And, you said "PT" in the above post #17 but I assume you meant OT. Do twist the leads to the speaker jack or impedance selector (I know your amp doesn't have one,...
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    THIS^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ...

    THIS^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    Adding a pedal won't induce hum in the amp because it can't increase the amps gain. Rather, it increases signal gain going into the amp. So, as Enzo...
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    It's not just the V2B drive triode that can be...

    It's not just the V2B drive triode that can be problematic. Notice that the V2A triode is in phase with the input triode (V1A) and fed from the same power supply filter node. This has been a pitfall...
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    There are pro's and con's to muting input or...

    There are pro's and con's to muting input or output. Since you only have one additional gain stage I think muting the output might be favorable. One reason is that the power supply for that amp...
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    Do it like this. One six pin relay (actually 8...

    Do it like this. One six pin relay (actually 8 pin with the actuator voltage). I changed the 510k resistor to 1M so that I could add a 1M to the other side of the relay switch for a total 500k...
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    I don't like this option either. I'm not sure...

    I don't like this option either. I'm not sure what the 2M pot function is. If it's it's just a fixed trimmer and not user adjustable this may be ok. Otherwise when it's at full CCW rotation it will...
  8. Well how can NOT give a thumbsup for that? But...

    Well how can NOT give a thumbsup for that? But it's unlikely. I don't get any orders anymore and I've only built five of this model. Actually four. One is my personal amp so it doesn't count. No one...
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    Eewww! I've only had to clean up after that sort...

    Eewww! I've only had to clean up after that sort of thing twice. Such a smelly mess. And you will never think you got it clean enough ;) Still beats having them go off like little fire crackers or...
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    I do have horse blinders on, I suppose, because...

    I do have horse blinders on, I suppose, because I'm not an active member of any other forums. In my head this place represents "the rest" of the demographic in this amp genre that isn't me. I'm...
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    I distinctly DON'T hate to be "that guy" in this...

    I distinctly DON'T hate to be "that guy" in this instance... The Chinese can make anything. And well too. But there's sometimes problems with spec on raw materials. Like which copper alloy,...
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    Well "I" do because I don't just build, I design....

    Well "I" do because I don't just build, I design. So things like surge voltage matter to me. Guys that build often use caps that some reputable source has already determined the suitability of for...
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    That seems like an odd way to indicate voltage...

    That seems like an odd way to indicate voltage rating.?. AC/DC maybe?
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    Doing a strictly visual evaluation of the Rola...

    Doing a strictly visual evaluation of the Rola speaker in your Bantam Bass I discovered that the basket used on that speaker was typical of the early 60's. Mostly for their old school alnico models...
  15. :mad: :mad: :mad: :mad: :mad: I always worry...

    :mad: :mad: :mad: :mad: :mad:

    I always worry about this and take it a little personal when it happens because my design is not UN TrainWreck like. And I always feel compelled to mention that I...
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    Well there IS another option... What earache...

    Well there IS another option...

    What earache has is a cabinet, chassis with pots and tube sockets, transformers already mounted, tubes,.. I think everyone see's where I'm going with this. Gut that...
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    Well right now the amp is unstable. If the amp is...

    Well right now the amp is unstable. If the amp is returned to original "working" condition it won't be. Then any modification that causes instability could be handled on a case by case basis. JM2C
    ...
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    I agree that that amp sounds awful. So much so...

    I agree that that amp sounds awful. So much so that I think that once earache's amp is restored and working "correctly" that would be a good time to consider improvements to the circuit. But not...
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    Hope the baffle can be removed without too much...

    Hope the baffle can be removed without too much destruction. And that Axtman owns a jigsaw ;)
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    He should have added a wink emoji since I'm sure...

    He should have added a wink emoji since I'm sure he was just making fun that stuff was stuck to the magnet in the photo.

    Americans have about as refined a sense of humor as Germans ;)
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    You're going to have to trace every pathway The...

    You're going to have to trace every pathway The photo provided by g1 should give some idea about how lead dress was handled. You may need to remove and mark such leads as keep you from lifting the...
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    Well I'll bet it's not a 330uf ceramic cap ;) So...

    Well I'll bet it's not a 330uf ceramic cap ;) So that's not what the board or schematic is showing. And herein are the problems with making corrections from a remote location.

    And you're right...
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    Well in actual photo's of stock amps I don't see...

    Well in actual photo's of stock amps I don't see a capacitor physically next to that dual ganged pot. Nor do I see the long flying shielded leads from the board that your photos show. It's very...
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    Sure. But plain ol ink pens probably had...

    Sure. But plain ol ink pens probably had something coser to a basic india ink product in them back then. Which was carbon in water with a little plant gum or egg white. Modern ink pens use dyes mixed...
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    I'm not personally familiar with that weirdo...

    I'm not personally familiar with that weirdo speaker, but I've seen the pictures and read about it some in the Teagle and Sprung book. It was a strange time for Fender, and amps in general ;)
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    Is it trapezoidal? Otherwise... My experience...

    Is it trapezoidal?

    Otherwise... My experience with a few non Celestion Rola speakers is that they sound pretty good, but usually aren't very loud. I did have one 10" that I really liked in a...
  27. Nah. I can think of a dozen threads started by...

    Nah. I can think of a dozen threads started by new guys that just wanted to fix their amp which simply petered out at some point. Never to hear from that member again. There are other members here...
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    BING BING BING BING BING BING!!!!!!!!!!!!!!!!!! ...

    BING BING BING BING BING BING!!!!!!!!!!!!!!!!!!

    Restoring the amp components to original and trying to match the stock lead dress as close as possible from pics will likely bring the oscillation...
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