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Should be 3.2dB, but 0dB would be best!

The LED can be changed out, but generally modification is discouraged. If it gets broken in the process I'll be the one having to deal with it! TBH, I haven't tested it with the 'line-input energiser' yet...

Nicely summarised this morning by HiFi Pig: https://www.hifipig.com/classic-audio-spartan-15-mkii-phonostage/ New enclosure, extra LFC settings (same as the S20), improved protection circuitry for 'PSU rollers' :rolleyes:

You're right there - 100V double-ended polypropylene film, so distortion free, very low inductance, and very temperature stable. Lots of incoming quality control on these for tolerance/leakage at 70% of rated voltage (twice what they're subjected to in the design). Unfortunately you can't get...

LOL - all I can say is see the measurements in the first post! Zero failures in the field related to these parts for almost 3 years of production.

I may have to challenge that figure... If you were to amplify by 44dB and have 120mV of (peak) headroom at the input, then you'd need an output level of a whopping 19V peak. This unit seems to have a 15V split supply (LM311/337 regulators running 300 and 3600 ohm set resistors), so most op-amps...

So we have a 300R stopper resistor. Not much for impeding RFI, but also not too bad in terms of noise contribution... I wouldn't like to try this for a commercial product, but each to his own. Of more concern, IMO, is the front end gain is fixed at 30.6dB; flat for the passive RIAA network that...

Probably the quick-and-dirty solution, then... Just use a big resistor of a couple of kOhms in series with input amplifier. It's noisy, but it does the job. See link below for an example (R2L): https://sound-au.com/project06.htm EDIT - not even the biggest source of noise in that design. R5L...

I wholeheartedly approve :cool: !

I only have 50cm in my setup - the advantages of a small phono preamp that can be placed near the TT are not insignificant!

Because, while most audio op-amps such as the NJM2068 and NE5534 have excellent RFI handling in an audio setup, without audio-band detection below 20MHz or so, they start detecting with horrifying efficacy once you get past 50MHz. This is especially true in the GHz's where you have high levels...

Mainly because I get often order requests for MM phono preamps when the user has an LOMC cartridge and vice versa :rolleyes:. Or 'I have a problem with hum in the setup and want you to fix it for me' - usually caused by wiring issues in the turntable or ground path and not solve-able by changing...

Looks about right to me. A nice first-order function at 6dB/octave as intended. At 100Hz, you get about 26dB at 1kHz, which is better than half of the cartridges out there. By digital-audio standards, it's obviously unacceptable, but within the limitations of the format it works very nicely...

From the manufacturers perspective: easy to implement with little electronics knowledge - you just need to switch in the components that amount to whatever you want to write on the switch face. It adds perceived value for little effort/allows the manufacturer to claim it's necessary for 'fine...

That's a very intuitive explanation, but in practice it's less than a 0.004% of the mechanical resistance of the cartridge, even with the outputs shorted... https://www.audiosciencereview.com/forum/index.php?threads/phono-preamp-headroom-why.56265/page-7#post-2066165 From a year or so ago...

I don't think it's a good idea to include these, as they do confuse people a bit, and can also be conflated with the total system capacitance which would lead to poor results. The small capacitor that yields most of the input capacitance of 120pF is 100pF, and has to be connected after the RF...

I keep trying to tell people this very thing - but nobody seems to take any heed :cool:! The high-output MC cartridges are excellent, but the market loves these troublesome low-output devices for reasons that escape me most of the time...

New parts arrived, so a limited run is now available at the old price (GBP720)...

I don't know what kind of cheap floozy you boys think I am, but 24,000 is obviously priced into the ground. 24,999, please.

Yes, I quite agree. I certainly wouldn't base an entire sandwich around the stuff, however it seems my indifference to it, despite the cultural connotations, is not a rarity! Someone should report them to trading standards really. The new slogan should be: 'you'll either love it or you'll hate...