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  1. Try this to cure ear splitting tweeters. it...

    Try this to cure ear splitting tweeters. it takes ten seconds and it helps or it doesn't. GO all Bose on them and turn your speakers to face away from you. Bounce the sound off the wall. Don't...
  2. That looks convenient. I decided they didn't all...

    That looks convenient. I decided they didn't all have to be in one spot. SO I had a special outlet on my bench riser, and a handy wall switch - same Leviton switch I might use on the bedroom wall -...
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    I draw out schematics all the time. I too start...

    I draw out schematics all the time. I too start with just the tubes. If there are odd tubes like 6SK7 or 6C4 that I don't remember the tube pin numbers, I add them to the drawing. I also start...
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    Just a note: on 5150 et al, I don't bother...

    Just a note: on 5150 et al, I don't bother drilling out the rivets. I can measure those resistors from the solder side. ANy need replacing I just unsolder them and poke their wires on through the...
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    Power supplies are specified lower left corner.

    Power supplies are specified lower left corner.
  6. That is why they make a zillion types of tool,...

    That is why they make a zillion types of tool, there is one for any circumstance.

    I have a pair of LOOONG nose needlenose pliers. And that long nose bends 90 degrees. So your handles remain...
  7. Thread: Earning my supper

    by Enzo
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    Oh it was all a good thing. Rj is a good friend,...

    Oh it was all a good thing. Rj is a good friend, does a lot for me. Fixes and sells my gear for one thing. He and his wife join me and mine often for lunch or dinner in town, many times with my...
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    Wow, I even have schematics for that in my...

    Wow, I even have schematics for that in my storage.
  9. Just my thoughts: perhaps while the tube may...

    Just my thoughts: perhaps while the tube may take longer to warm up, it may not be the result of a design for a controlled interval. If I recall, the controlled warm-up was like 11 seconds. ...
  10. I have a small pair of dikes from Utica Steel. ...

    I have a small pair of dikes from Utica Steel. They were my dad's. I have had them for close to 70 years, not sure when dad bought them. Still tight, still sharp.

    I had a nice pair of Erem...
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    So in recap: Our schematic was wrong, the silk...

    So in recap:

    Our schematic was wrong, the silk screening was wrong, the parts installed were wrong. It's a hat trick.

    general error being three 22 ohm resistors had 220 ohm resistor in their...
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    Not only usually, that is exactly what they say. ...

    Not only usually, that is exactly what they say. I attach the disclaimer from the Fender Service collection.
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    I tip my hat, your sim told the tale. What...

    I tip my hat, your sim told the tale.

    What continues to nag at my souls is how did this ever work. it wouldn't have passed QC with 30v on the speaker.
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    I think marketing mainly. I maintain that SUVs...

    I think marketing mainly.

    I maintain that SUVs and running shoes all started to look like one another. And nowadays, so many products have to have sweeping lines and patterns, like many running...
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    I have never seen an amp with that feature. ...

    I have never seen an amp with that feature.

    Just thinking, the cathode of a CF tube does not come up to voltage until the tube is heated enough to conduct. The plate will instantly come to B+,...
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    Ah, so more like the LA15 schematic then?

    Ah, so more like the LA15 schematic then?
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    I don't recall ever seeing a fused screen supply...

    I don't recall ever seeing a fused screen supply except in cases where they were separate supplies, such as a 700v plate supply and a 300v screen sup-ply. generally screens are just a node on the B+...
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    Well, a speaker hums a LOT when amps make DC. I...

    Well, a speaker hums a LOT when amps make DC. I tend to think it is stable and just offset, but it is simple to find out. Slap a scope on it.

    I know we are throwing opinions around, so..I see...
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    NO, they split the resistor in two. Note above...

    NO, they split the resistor in two. Note above the diffy pair, R30, R30A, R30B. I THINK the As and Bs were added where originally had been just a wire, and they didn't feel like finding new part...
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    I cannot say that. Just pointing out that even...

    I cannot say that. Just pointing out that even with combined technical might we have been unable to solve this.

    I calculated quite a few posts ago that R23 is dissipating something like 0.8 watts...
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    Caps are two parallel conductive surfaces,...

    Caps are two parallel conductive surfaces, usually foil or something similar. Those are connected to the outside world via either wire leads or mabe terminals of some sort. Too much current through...
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    What I am seeing is that neither of us - both...

    What I am seeing is that neither of us - both with reasonable approaches - is not getting the right answer. I don't see what you are missing, and of course vice versa.


    Some posts ago, I...
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    You're right, not much better. But a have to say...

    You're right, not much better. But a have to say thanks for doing it.
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    Actually, don't ask that. Clearly it needs to be...

    Actually, don't ask that. Clearly it needs to be corrected, so correct it. THEN tell us if it made the difference.
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    The schematic looks good but hard to see. Do you...

    The schematic looks good but hard to see. Do you have a scanner? My printers are also scanners, for example. A pdf scan might be easier to work with. Unless it is the same as the one posted up in...
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    Rocket surgery, but close enough...

    Rocket surgery, but close enough...
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    My concern is this is the same circuit they have...

    My concern is this is the same circuit they have used in numerous models. PArts are essentially the same. The amps work.

    What base current would Q8 need to conduct say 20ma?
  28. Or this one: "I get no sound from the input."

    Or this one: "I get no sound from the input."
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