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The rack effects that are intended to run at line level generally have an input impedance too low for a Hi-Z guitar signal. However, I've noticed that the...
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Special thanks to TC Electronics
This is a very professional outfit. I have an old M1 with a missing knob and finally decided to order a replacement. I went to their web site and requested...
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Sounds like your field coil is energised if you get some good noise out of it. If all else is good with the amp, it may just need a recone. Gently move the...
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The field coil is 1000 ohms. Given the dropping resistor in series, it would see around 100mA, and the winding would take about 11W to operate. Connected...
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I don't disagree at all, only making note of how in 1947 that represented cutting edge manufacturing capability for 'new' technology of the time. Indeed,...Last edited by GibsonLover; 10-21-2010, 10:53 PM.
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field coil wiring
I met an old-timer over the weekend with original Gibson service manuals with my schematic of the GA-75 and no reference to the field coil at all. I'm absolutely...
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There is a fine line between any kind of snobbery and plain ignorance. One may firmly believe something in their own mind whether it is true or not. It's...
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"Is that a dead F15N or a dead F12N? "
F15N. I have two Gibson GA-75's from the early 50's, one with the field coil and the "newer"...
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This is great, timely information. I have an amp with a dead F15N. I've heard about the higher sensitivity, but now I gotta hear it. I just hope they can...
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My Crestline is a '62 and also had a 8" Radio Shack speaker in it. I bought a 10" Jensen from 1966, and it really sounds good without even touching...
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The two channels are already out of phase, so if you haven't noticed, it's probably not an issue. It's no different than the BFDR, which I also find acceptable....
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It works very well. I did it to a Princeton Reverb just by following the 6G15 schematic. The bass is already rolled off quite a bit on any spring reverb circuit...
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If you look at the original 5C3 schematic you referenced, the preamp has grid leak bias. The 470K you are referencing is actually a load resistor for the...
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Fender Art
I always though they were done with templates, so that's how I started drawing them too. That was the style I was immediately drawn...
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James Vs. Fender
Use the Duncan tone stack calculator. If you set the controls flat, the Fender has ~5dB more loss. You won't use it that way,...
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You can position the sag resistor on the PT center tap lead too, in place of the proposed zener. One could even use both, depending on how much B+ reduction...
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If you like the Harvard, you'd probably like the Princeton (12AX7's). You might consider the 6G2 Brown Princeton with the 5D3 Tweed Deluxe output section....
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Maybe it's for ohMMMMMMM's. Who knows. That's an odd convention that does not seem to be applied consistently within the same drawing.
I'll agree most...
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Lexicon Signature 284 voltages
I was asked for the tube voltages. These were taken left to right from the front, as if you were reading the...Last edited by GibsonLover; 05-24-2010, 11:40 AM.
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Replace the wire from the V1A volume wiper to the right side of the channel switch with a 220K resistor.
You might find some other schematics that use...
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