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I would suggest using polystyrene caps as they are extremely stable (no capacitance variation with frequency) and available in 1% tolerances. Since this is a disc input you want accurate values. 63V capacitors will do the trick _ Quad 33 runs off approximately 12V IIRC. 10nF and 1n5 should be...

Measure the voltages with globe in circuit and ascertain if digital circuits are getting the required voltage - if they are you can assume they are working and thus could be protecting the amp from the fault that blows your output transistors

On and off is usually harder on the equipment. Valve heaters when cold, have a very low resistance, so at switch-on a larger than normal current flows until the heater warms up. Old filament light bulbs almost always fail at switch-on and this is why. But then again valve heaters dont operate at...

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12VA / 220V = 55mA that is enough to stop your heart. They only way to stay safe when working on mains connected apparatus (valve or solid state) is common sense and knowing what it is you are doing. High voltage is high voltage regardless of where it comes from.

Ha - not going to ask what kind of music is noise! The filter aims to prevent interference from getting into the cable

Attempts to prevent interference getting into the cable and interference getting out of the cable.

The above measurements show that the difference in sound is die to the listeners ears - which is exactly what the Fletcher-Munson curves measure. Adjusting tone and loudness controls for low(er) listening levels is compensating for how your ears work not your equipment - audio equipment of...

Older Samsung TVs stopped supporting Netflix from today. My TV (2012) gave me a warning a couple of months back. Cheapest solution would be to get a media player.

Audion from 1906. First vacuum tube - I presume they didn't make too many of them

Use the volume control 😁 Your DEC clips at more than 2V input. Your preamp amplifies the input by 3.89 times. The preamp volume control determines the size of the output signal down to 0V. Set the DEC volume to maximum. Adjust preamp volume to suit your required loudness. If the DEC is...

The AVR is doing frequency splitting so all you need is a preamp with a gain of whatever say, 2 - 5x. You can easily build an op amp based one - google 'opamp circuits' - you'll want the circuit posted below. I would use 3k3 for Rf and whatever you need for your chosen gain for Rin.

According to analoguedept.com: “The easiest way to accomplish a proper alignment between upper and lower bushings is by assembling the motor without firmly tightening the 4 bolts that hold the assembly together. Leave the nuts just barely loose enough to allow shifting position at both upper and...

I rebuilt mine about 5 years ago - not as daunting as it seems. You’ve done the hard bit - taking it apart - clean the felt washers and impregnate them with lots of oil, bolt it back together (I think I used 2.5mm nuts n bolts to secure the lower bearing) loosely so you can still move the top...

Chevrolet Nomad

Ford XR6 Interceptor

Patrick Bangie 0833426437 did the same fro me blocked bathroom pipes, fixed it all at a very reasonable price

The advantage of an SMPS is that you don't have any low frequency interference. In a linear supply that is around mains frequency 50Hz plus the harmonics thereof - interference at these frequencies is extremely hard if not impossible to eradicate (if you look at a spectrogram of almost any...

Yip, feedback resistances are R11 and the output resistance of the 12AT7

Well done @Ajay-L a testament to your considerable skills!