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I doubt you will ever see anything branded Western Electric that is competitively priced?.

NI believe that some heaters are specced as current being the overriding factor and in others voltage are the defining factor meaning that yes, for a P valve the correct current will not guarantee the expected voltage but should give the correct wattage. Agreed that the product of these two...

What kind of cables do you think they use in those UFOs? Sent from my SM-A715F using Tapatalk

Flapping woofers when nothing is playing means acoustic feedback so isolation as mentioned or repositioning are solutions. Cartridge tonearm mismatch will exacerbate the issue but may not be the root cause

Most "P" equivalent tubes were designed for series usage - the Phillips datasheet specs PCC88 as suitable for series or parallel heating. At least "P" series tubes we know were manufactured back then and to spec - today's manufactured ECC88s simply could be badly made - were you using modern or...

If the fuse is gone replace with like (500mA slow blow) and see if your amp works. If it does then switch off immediately and have it checked - something would have blown the fuse and that is the issue you want to isolate. OTH fuses can wear out... so it may just be that. Sent from my...

So you saying that just the Rotel and loudspeakers had the noise? If so, the Rotel is at fault, but a buzzing could also be interference. Switch off routers wifi etc and see if that makes a difference. Also try just the Rotel and loudspeakers plugged into a wall socket - no multiplug. If it...

Is the noise bassy or trebly? If it is hum (bassy) you probably have some sort of earth loop, if it is hissy (trebly) it could be interference. When you say the noise diminishes when the subs are disconnected and is independent of volume setting that tends to imply an earth loop. Try connecting...

Guitar amp stuff but it has the look: https://www.tubesandmore.com/search/node/grill+cloth/?categories=Grill%2520Cloth%252C%2520Tolex%2520%2526%2520Piping

Your usage of a variac is correct. Best tip: get lots of multimeters (i have 4) - when you power up a circuit use all the multimeters, clipped onto the relevant voltages typically HT and then each valve?s bias voltage - that way you can instantly see what is happening. Starting up a circuit...

Variac and/or isolation transformer must have a VA rating greater than the power you will want to draw. So say you building an amp requiring 500V at 200mA you want a rating of more than  100VA. Variacs are used mainly to simulate mains variations e.g. will my regulated DC heater supply drop...

Going to need more than doubler to get 16VDC from a 6.3VAC winding

The gently maligned Rega Elys 2 really does work a treat on those tables

No converting the preachers here  ;D

Schmitt?s don't have unity gain and the feedback loop encompasses the entire amplifier, so there is no explicit feedback just around the splitter. Thus the splitter does have Miller capacitance but, more importantly, it is fed by a pentode stage which means a high output impedance from that...

Not to split hairs but it?s not a paraphase but a Schmitt splitter. And if i remember correctly (which is highly doubtful) that particular configuration was discussed at length on this forum. The pentode eliminates a triode?s Miller capacitance and the resultant increase in bandwidth then allows...

Seems like you have combined the two channels - which makes sense really :-). Try making a Y cable with a 4k7 resistor in series with each channel Sent from my SM-A715F using Tapatalk

Don?t use u-links or RCA plugs etc there is 400V exposed there plus leaving the screen disconnected could damage the valve. Rather use a switch and be sure to operate that switch only when the amp is off

Anything with even the vaguest connection to software is actively working to make itself obsolete... Sent from my SM-A715F using Tapatalk

Indeed but the ability for two pieces of conductive material to behave like a capacitor is entirely based on their physical size, the spacing between them and the kind of insulator that separates them. Currents and/or voltages through them does not play a role. Any conductor possesses...