Tube Microphone Preamp A while back a friend that does some home recording asked me about a tube microphone preamp. Something I hadn't designed yet... so I designed one. This particular design is pretty high-end. I started with the best microphone input transformer I could find (at least...
The Altec 1566A: A Vacuum Tube Microphone Preamp / Direct Box Project Original ©1996 by Eddie Ciletti for publication in the January’97EQMost recent update: November 2004 The Essence of Simple, Class-A Vacuum Tube Circuitry FIGURE-1:Three overlayed oscilloscope traces ...
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12AU7 tube preamplifier has been slightly modified so that I could use parts I had on hand. Here is the schematic of the 12AU7 Tube Preamp I came up with (sorry about the over sized schematic). I used 12AU7 tubes and a B+ voltage of about 150V. Even at 150V I could not get...
The other setup, "Dedicated microphone", consisted of a pair of dedicated pressure microphones, typically used and advertised for impedance tubes. The microphone part num- ber was 377A10 (PCB Piezotronics, USA). The signal was powered using a dedicated preamp (426B03, PCB Piezotron- ics, USA...
I'd like to use this Preamp. to drive my 250 ohm headphones. So am thinking of using an impedance matching transformer on each side. Problem I foresee is a large step-down: ~220K to 250 ohms. That's near "1000 to one" for the transformer! I've been looking around for such a ...
of miniaturization, until I looked closer. This is an ad for the Model MO-23 CB radio from International Crystal, which was so compact that it could hide under the dash, in the console, or in the glove compartment. As you can see, the radio isn’t much larger than the microphone. ...