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Injecting the NFB into the tail as well as the second grid is a historical artefact from Fender. Really the NFB 'ought' to go to the second grid only. The...
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Yes it is true that the 12AT7 draws more grid current than the 12AX7 and therefore will clip harder when driven from a similar source impedance, and hence...
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Aluminium electrolytics are usually quite happy running right up to their voltage rating. But tantalums are not; for DC power applications (i.e. where the...
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I depends on the load current, because tube rectos have internal resistance.
With SS diodes you get 1.4 times the transformer voltage at no...
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Nor really. The spikes in a power supply are principally due to transformer leakage inductance, which you don't have in a clipping circuit....
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No, the core size has nothing to do with 'unlinear'. A small VA transformer will have more resistance and therefore more 'droop' under load than a high VA...
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For a two-phase cap input rectifier, the RMS current in each half of the secondary is not half but 1/(root2) times the total average ripple current. If you...Last edited by Merlinb; 09-15-2017, 01:44 PM.
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Yes it's from that one.
Yep, but there are plenty of NOS and you can still get the LSK170 and LSK389 I think....
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Well yeah... but "if you make the source even quieter (non standard) then eventually the amp needs to be made even quieter too" seems a little unhelpful...Last edited by Merlinb; 08-16-2017, 12:46 PM.
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That's true if they're operating in the saturation region as the analysis assumes. But wouldn't our practical circuit be more likely to operate in the triode...Last edited by Merlinb; 08-17-2017, 07:55 AM.
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When I say 'irriducible noise' I'm talking about the intrinsic noise of the pickups (and other guitar electronics) that you actually have; it's just the accepted...
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Because even a triode is quiet enough for guitar, and it likes high voltage, which is what you conveniently have in the amp already. Noise in guitar amps...
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Broad rule of thumb is 1uV EIN for a garden variety triode, 0.3uV EIN for a garden variety JFET, both assuming negligible source resistance.
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The ear is logarithmic so 30% off the top end as actually not very much (30% off the bottom end would be a different story). Like I say, you get more audible...
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There's still nothing to stop you putting the grid stopper after both the cap and grid leak though, FYI....
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That's not what I would consider significant particularly when the resonance is only affecting harmonics; you get as much variation simply by putting your...
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Reducing the stopper to 10k is what reduces the hiss (Johnson noise). Adding the cap maintains the same RF bandwidth as before -it is a separate issue from...Last edited by Merlinb; 07-13-2017, 02:13 PM.
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Hmm that is interesting! Thanks for sharing! https://www.manualslib.com/manual/10...page=13#manual
(Components...
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The attenutation caused by 27k and 1Meg is practically nothing (0.2dB), so it really makes no difference. So I doubt Ceriatone even gave the attenuation a...
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Quite right. In a guitar amp, there is rarely and point in calculating gain. Unless you're a total noob you know the answer is always going to be 'more than...
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