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 1940 - 50's Seeburg Jukebox MICROPHONE PRE-AMPLIFIER AND MIXER " TUBE TYPE " US $160.00 
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 Seeburg KD200 KS200 and L100 pre-amp circuit board TPAU-1 US $30.00
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 Wurlitzer 1100 pre-amp dome cover with Kit 101 pre-amp US $135.00
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 Rockola pre amp circut 50649 US $14.99
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 ROCK OLA JUKEBOX SYBERSONIC (RED) SYSTEM PRE AMP PCB PART #58438-2A-NOS US $315.04
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 1946 Seeburg Microphone Pre-Amp & Mixer Power Supply US $100.00
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 View Vision Internet Jukebox Kitchka Audio Preamp US $275.00
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 Seeburg KD200 KS200 and L100 pre-amp circuit board TPAU-1 with transistor US $38.00
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Pre Amp
How Tiny Will They Get? - A Look At Super-Mini Audio Power Amps
Newest models of super-mini audio amplifiers show the continuing trend of miniaturization of consumer devices such as cell phones or computers. Products are shrinking at a rapid tempo. At the same time, manufacturers are packing in more and more features. You probably still recall the good old tube amps which would dominate the living room. Whilst tube amps are even now popular among fanatics, audio amplifiers nowadays are solid-state amps for the most part.
Modern solid-state amplifiers combine the conventional pre amp and power amp stages into a neat single box no larger than a DVD player. A new generation of super-miniature amplifiers, such as the Amphony Model 100 microFidelity amp, has become feasible due to new developments in audio technology regarding power efficiency. Even though these amps are as small as a deck of cards, they are able to deliver up to 50 Watts power and without difficulty drive a speaker to full volume.
Past audio amplifiers with "Class-A" and "Class-AB" architectures have quite low power efficiency. Only a small part of the consumed power - typically in the order of 20% to 30% - is actually transformed into audio by analog amplifiers. The left over portion is radiated as heat. Therefore analog amplifiers require a fair amount of cooling. The amount of cooling depends on the amplifier rated output power. These heat sinks prevent the amplifier to be built into a small form factor.
The "Class-D" topology of digital amplifiers provides higher efficiency than analog amps. The efficiency normally ranges between 80% and 95%. This allows digital amps to be miniaturized. One major difficulty which has slowed the growth of "Class-D" amplifiers is audio distortion which is caused by nonlinearities of the switching output stage.
Some new amplifier technologies have emerged. Amongst those are "Class-T" and newer generation "Class-D" architectures. These types of new architectures, such as the technology used in Amphony's Model 100 use a feedback mechanism. The output signal is fed back to the amplifier input. By using this feedback, the amplifier can compensate for nonlinearities of the output stage. This allows the distortion to be reduced to levels similar to analog audio amplifiers. At the same time the amplifier offers the high power efficiency of digital amplifiers.
These new generation miniature audio amplifiers open up applications where traditional amplifiers would fail, such as speaker installations where space is premium, such as in-ceiling speakers and applications that connect speakers to a cable box or DVD/MP3 player.
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Frequently Asked Questions...
Can I use a DAC and a Power amplifier or I need a pre-amp between those?
I'm new to the audio stuff.
I have a computer HTPC, with a audio card soundblaster x-fi
I want to buy some Hi-fi stereo system.
I saw some integrated amplifier ( wich does pre-amp + power amp)
Would it be possible to just use a DAC and a power amp, or I need the pre-amp.
Thanks.
Answer:
If the HTPC has some form of digital audio out like an RCA jack (my main box has this) or Toslink (optical), then you can get something that has this as an input. This is what I do. I run a Yellow RCA composite cable from the Digital Audio RCA jack out of my PC to the Orange Digital Audio RCA Jack of a 5.1 home theater. I can get 5.1 audio out of it. This is by far the best way as running analog signals from computers to audio equipment usually ends up in a 60 cycle hum you can't get rid of.
