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  1. Thanks for posting the review. It's always seemed...

    Thanks for posting the review. It's always seemed strange to me that Fender does not sell replacement PCBs for these amps since they do fall apart over time. I've seen some that have been repaired...
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    Are you sure it isn't the same amp? ;-) Two...

    Are you sure it isn't the same amp? ;-) Two Gibsons exactly the same is actually suspicious.
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    Reading photos can be tricky, but that kind of...

    Reading photos can be tricky, but that kind of looks to me like someone made a new speaker baffle for this cabinet. Also, I just googled it again and saw one photo of this cabinet with the back off...
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    That layout is for the third version of the...

    That layout is for the third version of the GA-40, while yours is the second, so there are some minor differences in wiring of the volume pots and tone control.

    Further down that thread is a...
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    I can see the photo now. Same version I just...

    I can see the photo now. Same version I just worked on. All the electrolytic cathode bypasses are on the back side of the board. This thing was not built to be service-friendly.

    I moved the...
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    Your image link doesn't work. I ended up...

    Your image link doesn't work.

    I ended up doing a complete rebuild on this GA-40 because it was a basket case. All the board components were way out of spec, most over 20%, many close to 40%. Even...
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    With a little more digging, I think I've got the...

    With a little more digging, I think I've got the sequence better figured out.

    First you had the first version of the GA-40 with 6SJ7 input tubes and a very different amp circuit from the...
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    Gibson GA40 Les Paul versions

    I'm just finishing up a restoration of a late 1956 Gibson GA40 Les Paul amp, a real basket-case, so I've had to get deep into the details. As with almost all Gibson amps, there are variations from...
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    One tweak I read about was changing the Master...

    One tweak I read about was changing the Master Volume pot on this series from a linear to an audio taper pot to make it more user-friendly. I noticed that the MV pot is pretty abrupt on this one.
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    Hot Rod Deluxe service points

    I'm working on a MIM Hot Rod Deluxe (2002 board) and have dealt with the standard problems with the resistors that cook the board, solder joints, B+ caps, jack contacts, and so forth. It's for a...
  11. One of the ways a voice coil dissipates heat is...

    One of the ways a voice coil dissipates heat is by radiating it into the top plate; the metal edge of the cap actually conducts heat away from the coil better than air. With square waves, the coil...
  12. I saw a Blues Deville 4x10 with similar speaker...

    I saw a Blues Deville 4x10 with similar speaker damage, but the owner knew what happened. One of his friends tried using it as a bass amp, and, being a bass player, he cranked the bass in an...
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    Magnetic tape history

    I was watching a TV show recently set during WWII that featured people on the British side (not at the top ranks of military) using a reel-to-reel tape recorder, and I started wondering if this...
  14. I think it might help to think about it...

    I think it might help to think about it historically.

    The traditional sound of the electric guitar, what we think of as "good," is the result of a process of evolution that began with simple tube...
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    Deluxe Reverb Syndrome

    I've been noticing a pattern. Lots of guitarists buy Deluxe Reverbs for the size and weight, but then complain that it "doesn't have enough clean headroom," especially at lower frequencies, when, in...
  16. I don't think so. I think it's a matter of having...

    I don't think so. I think it's a matter of having it so the whole bead of glue skins over all at once. If you wait too long after applying the accelerant, the skinning slows down, and you start to...
  17. I ran some more tests, and I think I've finally...

    I ran some more tests, and I think I've finally figured out how to get a smooth bead.

    Using cardboard as test paper, you have to spray it with accelerant, let dry briefly, and then put down the...
  18. I live in the American Southeast, so high...

    I live in the American Southeast, so high humidity is a fact of life.
  19. Problems using CA glue for JBL reconing

    I'm doing my first solo JBL D120F recones, and everything has been going fine with one exception: the Loctite 410 black cyanoacrylate glue that a lot of people recommend these days for doing the very...
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    Multivox churned out a bunch of different...

    Multivox churned out a bunch of different versions of the 120.

    It's common to have a 12AX7 V1, grid-leak biased. V2 and V3 are a 12AX7 and 12AT7 that work together as the tremolo circuit. V4 is a...
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    Multivox Premier 120 Tremolo

    I've worked on a couple of Premier 120 amps and have one in the shop right now. It's from ~1954, the version with 12AX7s rather than 6SL7s.

    I saw a video online where someone was adjusting the...
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    This was the first thing I thought, based on my...

    This was the first thing I thought, based on my screenname, when I read about 32Ω 12' speakers. They are, in fact, only used in the earlier 80W Peterson Rhodes Suitcase Pianos, not the later 100W...
  23. For a resistor or choke-input power supply, the...

    For a resistor or choke-input power supply, the PT secondary voltage has to be higher than for a capacitor-input supply.

    A 5Y3 has higher internal resistance than a 5AR4, but Hammond Organ Co....
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    Dallas Arbiter Fuzz Face behavior

    I have a guy who's acquired a genuine ~1971 Dallas Arbiter Fuzz Face pedal in very good condition. They had gone to silicon transistors by then, and the originals here are BC108C, apparently...
  25. In terms of elevating the heaters, the idea, as...

    In terms of elevating the heaters, the idea, as I've read about it from various sources, is to make it so that the heater AC waveform never crosses the cathode voltage of the tube in question. Some...
  26. Fender's Tone Ring speaker cabinet vs. standard bass reflex

    A friend of mine is building his own copy of a Fender Tone Ring speaker cabinet, something I didn't know much about, so I started investigating.

    It seems to me that the Tone Ring design is just a...
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    This one is a Pro Junior III with a different...

    This one is a Pro Junior III with a different circuit. It already has the first stage bypassed with a 47uF cap. Much of the objectionable hum was coming from the un-bypassed second stage. You could...
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    For guitar amps, yes. For HiFi, you might want to...

    For guitar amps, yes. For HiFi, you might want to look at Mojotone's Dijon line. They are film & foil polypropylene and, IMO, very neutral and un-colored, not to mention very inexpensive relative to...
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