Recent content by atmasphere

Those Western Electric horns are quite a sight! A local museum here in town called the Pavek Museum (any audiophile visiting Minnesota owes it to themselves to visit the place) was the first place I saw one of those. They played it with a WE 211 amplifier that sat in a relay rack. Definitely a...

The Lockwood looks like an excellent speaker but if you want to hear what the 45s really do you'll want a speaker about 10dB more efficient. The one in the photo you just put up is good to 30Hz. You if your plan is to use this speaker with the 45s, you might consider putting a small capacitor in...

You are putting quite a lot more time into the idea of the finish than the OEM did, that's for sure. They likely just built it to be practical. Most of the prewar test equipment I've seen has had a darker finish, but that might well be simply because of the age rather than the original appearance.

Yes it is. Surprising to see in the opening minute, a Simpson 260 VOM sitting in the background on the left. I had several of those back in the 70s but when the digital Voltmeters showed up there was no looking back.

This is an HH Scott stereo FM tuner I picked up recently. It sort of worked; you could tune stations but didn't hear anything other than about a 400Hz tone, as if everyone on the dial suddenly were broadcasting tones instead of music. Obviously the power supplies had to be rebuilt, but they were...

Make sure you get those connections right! Before you start testing tubes from the wild, test a few known good ones so you know if the tester is working. This is a case where just putting in a competent film cap, but nothing exotic, will work great, like these.

I hope you get to testing some vintage tubes in that soon...

If no corrections like that, the crossover can be a lot less complex. My concern is the Dayton could well be a bottleneck in the system.

So can the same amp driving the 10" also do the 15s? Or does the speaker not allow that sort of connection? What is the impedance in the woofer section?

Looks like quite a switch there below the meter! Be careful with that.

Your speakers are easy to drive. You have so many excellent options available for driving the woofers. I must be misunderstanding something. Aren't your speakers 2-way? So the woofers are crossing over at 1600Hz?

IME there are bigger differences in the sound of class D than even in tube amps. Actually it isn't. Most class D amps are immune to crossover distortion. It occurs though I may have taken you too literally. Dead time does introduce distortion. In our design causes 2nd and 3rd harmonics. The...

That's the only way to do it with meters like that. I know exactly what you went through; the meters we use are built to the original 1934 spec by the same manufacturer that made them back then as now. Good work! That stuff can be really scary.

Sorry about that- I misread your comment and went down the wrong rabbit hole... A 50 Watt amp that makes 5 Watt in its class A zone is a class AB amp. The bias level insures that there's no crossover distortion as you rightly stated earlier. There are a lot of factors in play with any AB amp...

You are more likely hearing how the feedback is interacting with the amp (or just its distortion signature in general) rather than the transition point! With a lot of amps as you increase the power level, the distortion product changes with more higher ordered harmonics showing up. They cause...