Recent content by atmasphere

To start with, the iPhone uses a compression/limiting system so it can accommodate a wide range of sound pressures. The bandwidth, particularly in the bass, is also limited by the microphone size. There is also a cavity well resonance somewhere in the high end region. So an in person audition...

Had you considered having someone make a strap for you? If the leather is rotted it can give away without warning.

I use an Otari MX80 1" 8 channel myself.

If you keep this up there's a good chance it will look better than when it was new...

Too bad there was no response. These machines have a lever which engages the pinch roller. The bushing on which it rotates gets gummed up by the grease they used. You remove the lever, clean the bushing and put proper grease on it and it works. Teac machines have something similar. Fun fact...

The book will still be helpful as the testing techniques are the same. Persevere- if you are into prewar tubes this will be a handy (as well as attractive) device to have around.

One nice thing about the Hickok is if the tube information isn't listed, you can still figure out how to test it since the switches relate directly to the pin base of the tube. Then the only tricky bit is sorting the readings you're looking for. A tube manual is handy for that. Have you sorted...

A lot of testers have a tube rectifier inside. Sometimes that can be replaced with a solid state rectifier but you'd have to do some research to see if that is so. My Hickok 539B uses an 83 mercury vapor rectifier (I think they did this to reduce Voltage drop across it). I have a spare on hand...

Pretty important document for that tester! Was it mounted to the case and will you re-install it? Are you doing any refurbishment to the circuit?

I've done something similar. Class D in my experience varies wildly in sound moreso than tube amps do. Some are really terrible and makes you wonder how anyone would think they would be taken seriously; exactly what I was thinking when I had my first experience with one 25 years ago. Class D...

John Wolff of Classic Audio Loudspeakers has done a lot of that. He has both the big and the small Paragons in mint condition in his listening room, and as you might know has been making a very faithful reproduction of the Hartsfield for over 30 years. He's done a lot of work advancing the...

No worries! FWIW to be clear, I was not the one to bring up class D on this thread. Also FWIW, I've also pointed out on other threads how to get the most out of any SET. I participate in audio threads because I like audio stuff. I'm involved in music in any way I can- I play instruments, I...

One of my earlier SET amps was a type 45. I got curious about how a PP amp based on 45s might sound, using the same quality components. Usually when SETs get compared to PP amps vastly different power tubes are used so this was an attempt to level the playing field. The PP amp I built was...

3/4 Watt is about right for a traditional type 45.

What is the Golden Age? I recently restored this bit of audio history (late 1950s): This is about as elegant as you'll ever see a push-pull EL84 amp get.