Recent content by atmasphere

There will be a lot of electrolytic capacitors to replace! These days anyone working on electronics from the 1970s should expect to replace every one in sight. I do not use tantalum capacitors; if I find them I replace them with good quality electrolytics. Tantalum caps had a way of shorting...

Just to be clear, a GaNFET is unlikely to be used in a non-switching application, on account of their construction. They would rapidly overheat if operated in the 'linear' region. So if its in an amplifier, that amp will be a switching amp.

Make sure to clean the record/play switch! Best to do that with spray Deoxit in the green and black can. It leaves a non-volatile lubricant behind which is vital for the switch to work after cleaning.

Super cute! If a tube tester can be cute...

It can affect the slope of the transient. Greater bandwidth will allow the slope to rise and fall in a more vertical fashion. Obviously square wave response will say a lot about transient response in this regard.

Looks like a Hickok to me. Nice!

Room modes are caused by standing waves, so 'yes' to that bit. In my room despite my speakers being flat to 20Hz bass is weak at the listening position, but strong elsewhere in the room (near the walls) and elsewhere in the house. By adding two subs, one to my left and the other behind me, this...

Bass is often the one thing DSP cannot fix. For that you need a Distributed Bass Array, since standing waves are the primary reason DSP can't fix bass. If a standing wave is cancelling bass energy at the listening position, the DSP will make the amp put out more power, which will simply be...

No worries. 90% of room problems have to do with bass and can be corrected with a Distributed Bass Array. But glass is a different matter... I don't think we're in disagreement on this point! I spent a year looking for my next house simply because I wanted the room to work.

The room is a pretty big deal- half of the success story at least. I've seen a lot of people fall in love with a certain kind of speaker, and then struggle to find the right kind of amp to play them, because they don't like solid state or tubes or whatever. So I've been of the opinion for a...

With as much cash as many high end systems cost, the solution to this concern is to obtain a nice set of microphones, a decent recorder and then find a venue and performance you can record and stand to play again over and over. In that way you were there and know how the recording should sound...

IMO that is the best way to know what's on the recording.

Here's some peculiar things about feedback. In a tube amp, its usually applied to the cathode of the input tube. The audio is coming in the grid of the tube, so the two are mixed in the tube, which is not linear. IMO this is a poor practice but everyone does it that way, mostly out of...

That would have been pretty long ago! If you are setting up feedback in an audio circuit, you'll need a squarewave generator and an oscilloscope at a minimum to do it. That stuff has been around since the 1950s... from all the 'scope traces you see in the vintage magazines, its pretty obvious...

Obviously the wrong thing was measured. If it sounds bad, its bad. There has never been an amplifier that is genre specific. That such a thing exists is a myth. Any designer would love to know how to make equipment genre specific; they could make a lot more money... If the output filter is...