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Would you feel better if it were phrased as "doubling sensitivity?" If one transducer with 2.83 V input can produce 100 dB SPL as measured 1 meter...
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Glad to see the flanger hoax getting a couple mentions. I have one, and it's my favorite modulation pedal. It doesn't do wet panning, but it does have three...
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Easy fix - LED bias the oscillator tube, and put a diode across the intensity pot to prevent it from pushing the bias hotter. You could probably also decrease...
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You need to keep the bias balance control or you'll always have hum issues from not being able to cancel out the power supply ripple that gets to the screen...
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Does turning the "output tubes matching" control or "hum balance" control affect the hum?
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Yep, it was C7! The resistors were fine and since I don't have a good way to test capacitors I just replaced it. Swapped back in the original Q3 (since it...
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Merlin has a chapter in his preamp book about grounding and goes into detail about the ground-to-chassis connections. You can read the grounding chapter here:...
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You want to bleed *less* to ground, making the bias voltage more negative. It's a simple voltage divider comprised of the 1k and 27k resistors. https://l...
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I've always wondered this myself, but after seeing the uTracer curves, they're not passing anywhere near as much current as the 7591 datasheet shows. Possibly...
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140mV in, 3.02V out with no load. I did check loaded vs unloaded early on and didn't notice a difference so I just kept the load connected as it's already...
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Yeah, I assumed that. Before I started the supply voltage was a couple volts higher than on the schematic, but with the new Q3 the supply voltage is getting...
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Sorry it's been a long time between replies; haven't had a chance to look at the amp until today.
Q3 was barely amplifying - 3.6V on the collector...
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Neutral goes to power transformer. Hot goes to fuse, then switch, then the other lead of the power transformer. Safety ground gets connected to the chassis...
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Acoustic 125 Low Output
Schematic: http://music-electronics-forum.com/a...schematics.pdf
For reference, here's a similar topic: ...
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Has he tried using other speakers? What speakers is he currently using? To me it sounds like he's not unhappy with the overall tone of the amp and going all...
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Yes, sticking DC on a speaker's terminals will cause the coil to jump in one direction and stay there, but the suspension is going to cause it to bounce a...
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Have you tried turning the amp on in standby mode, letting it sit for maybe five minutes, and then flipping the standby switch into "play" mode?...
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