The Amp Garage

I'm not going to waste my time analysing those circuits to find out whether that's true or not. Besides, like I said, how they operate goes way beyond knowing just the nominal gain figures. To find out about inner workings of these effects and amps I'm way more interested in frequency responses, har...

Forget for a moment what the waveform looks like. Those are theoretical figures. That much the circuit tries to amplify the signal. By that factor / ratio. If the input signal amplitude is low enough then it can be amplified that much before running into limitations how high output amplitude the cir...

The figures are pretty much theoretical in a sense. Voltage amplification ratio / factor, or "gain", merely indicates how much the circuit tries to amplify the signal. E.g. 10x voltage gain tries to amplify 1V input to 10V output and so on. In practice, within specific margin the circuit works as in...

No. Gain of something like an amp is sum of all its gain stages. Just because the power amp stage clips first won't mean its the largest contributor to gain ratio. And no. We can't say "100dB is the highest gain where distortion is still usable" because such statement does not define input amplitude...

Once again, it’s impossible for the amp to have 115 dB gain because it causes clipping and the gain is reduced. The gain is not reduced, only the output voltage is limited by distortion. All the "gain" - gain being mere amplification ratio - is still there and 115 dB not limited by clipping is poss...

Sigh. I feel I'm repeating myself. There are various clipping thresholds. Some may be as low as 300mV (e.g. germanium diode), some as high as >150V (e.g. plate clipping of high voltage tube circuit). These are very much defined by the circuit. There can be variance in amplitude of the input signals ...

Then build it. Breadboard and 20 minutes. Granted to get your questions satisfied better and faster than trolling the forums.

We don't. 200 was quoted as approximate voltage amplification ratio/factor, (I assume) calculated from the feedback ratio of the non-inverting opamp according to basic electronics schoolbook rules*: (1M/4K7)+1=213.77 But it's an incorrect figure because one also needs to divide it by two because of ...

pdf64 wrote: ↑Fri Sep 30, 2022 9:35 pm How about quantifying the depth of distortion available by referring the clipping voltage back to the input?

Or use the good old input sensitivity rating?

Continuing to that, a comparator is a circuit that is devised to saturate to its maximum positive or negative voltage output, "ceiling", whenever its input signal flips to corresponding polarity. That circuit is all you ever need to clipping distort guitar's input signal as much as practically possi...

Yes, I mean the opamp operated without feedback. I suggest you first try just a single stage in practice to find out if that's enough of gain. :roll: Ok, so regardless of how much the sound is distorted, can we achieve a peak decibel gain of say 115 dB or more on the highest gain channels of solid-s...

And if that's not enough cascade an x amount of those.

Generally each spring is a delay line with its unique characteristics (spring lenghts and tensions are different in each spring). 3-spring tank has one delay line more so it adds a "fuller" and more complex reverb effect with more reverb artifacts. Decay time, I guess, is more dependent on spring le...

Even if I dial the gain up slightly, the onset of clipping is still sharp. How best to smooth it out? Get rid of global negative feedback. Drive output tubes with a low Z circuit so they don't "load" and clamp the PI when grid clipping. Different bias on PI? Lower gain overall. Try soft limiting th...

I have to say I don't see anything abnormal in those waveforms. Looks like moderately symmetric clipping of tubes to me. Here's a youtube clip that shows clipping of a single-ended amp towards both waveform lobes: https://youtu.be/_6ulkga5ekg Push-pull would be more symmetrical in how the waveform l...