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<p class="Wp-Body-P"><span class="Body-C">Tube Amplifiers</span></p>
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<p class="Wp-Body-P"><span class="Body-C-C0">Lyrita Audio</span></p>
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<p class="Wp-Body-P"><span class="Body-C-C1">The GM70 Amp</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">To provide a substantial increase in power output, and maintain the signature of
the single-<wbr>ended tube amp, the </span><span class="Body-C-C3">GM70</span><span class="Body-C-C2"> tube is ideal. Its properties are very similar
to the renowned 845 tube -<wbr> though the construction, pin layout, and heater requirements
are different. The GM70 is a more robust and reliable tube. </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">This is available now only as power monoblocks, with the GM70 tube operating at very
high voltages. This is the ideal operating point for the tube, and it shines in delivering
power and an extended response. The use of two chassis also allow for better separation
between transformers, for lower noise.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C3"> </span></p>
<p class="Wp-Body-P"><span class="Body-C-C3">GM70 SET Mono power amp</span><span class="Body-C-C2"> -<wbr> two stage, interstage transformer coupled. </span></p>
<p class="Wp-Body-P"><span class="Body-C-C4"> </span><span class="Body-C-C2">Tubes -<wbr> </span><span class="Body-C-C3">6E5P, GM70, 6C5S</span><span class="Body-C-C2">. Power output -<wbr> 35 watts/channel.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> </span></p>
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<p class="Wp-Body-P"><span class="Body-C">Tube Preamplifiers</span></p>
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<p class="Wp-Body-P"><span class="Body-C-C1">DHT Line preamp</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">This line level preamp uses the Russian 4P1L, as a directly heated triode, in a very
simple design. Filament bias is used, which aids in simplicity and stability. An
audio transformer serves as a load to the tube, as well as isolates the output. This
also helps control microphonics in the tube. Volume control is on the output. If
a lower output impedance is desired, the volume pot can be moved to the input.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">The sound is rich in tone, with excellent dynamics. A great start to the amplification
chain.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> Tubes </span><span class="Body-C-C3"> 4P1L, 6C5S</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> Gain 12 dB</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> Output Impedance 5000 ohms (volume at output)</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> 1250 ohms (volume at input)</span></p>
<p class="Wp-Body-P"><span class="Body-C-C4"> </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">Tubes -<wbr> 4P1L, 6C5S.</span></p>
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<div id="txt_10" style="position:absolute;left:140px;top:2864px;width:695px;height:401px; background-color:#f8d993;overflow:hidden;">
<p class="Wp-Body-P"><span class="Body-C-C1">Phono preamp</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">Tubes handle low level signals beautifully, with unmatched linearity. They are ideal
for the minute signals from the phono cartridge, to amplify and to equalize to RIAA
specifications.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">A new circuit design uses the high transconductance, high gain, dual tube, the Russian
6F12P. This tube brings great clarity in music, with excellent micro and macro dynamics.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">The active circuit has enough gain for MM (moving magnet) and high output MC (moving
coil) cartridges. </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">For low output MC cartridges, a step-<wbr>up transformer is required, ahead of the active
circuit. Consider this as part of the cost of a low output MC. Lyrita recommends
step-<wbr>up transformers from CineMag.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">Our environment is becoming more noisy electrically, with high levels of RFI (radio
frequency interference). The high gain tubes used in phono circuits are very susceptible
to RFI pickup. The only way to prevent this is to provide shielding to the entire
circuit and tubes. So, the chassis becomes a steel black box.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> Tubes </span><span class="Body-C-C3">6F12P, 6C5S</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> Gain MM 54 dB</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> Gain MC 80 dB with CineMag 1:20 step-<wbr>up</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> Output Impedance 3000 ohms</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> </span></p>
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<p class="Wp-Body-P"><span class="Body-C-C1">Why Tube Amplifiers</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">Tube amplifiers just reproduce music better. </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">Music has rhythm, melody, and harmony. Instruments have timbre. This rich harmonic
content is tied together in amplitude and time. Thus, music consists of very complex,
asymmetric waveforms. This complex relationship has to be reproduced faithfully by
the amplifier, for music to sound true.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">Tube amplifiers do this with higher fidelity. The reproduction of rich tone, and
harmonic structure, brings music alive! </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">Of all tube designs, the single-<wbr>ended amp is the simplest. This simplicity brings
great clarity in music, with excellent dynamics. It involves you emotionally, and
takes you closer to the music.</span></p>
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<p class="Wp-Body-P"><span class="Body-C-C1">The 2A3 Amp</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">Of all the DHTs (directly heated triodes), the 2A3 tube sits at the pinnacle. Introduced
in the 1930s, the 2A3 has continued unchanged to this day. Some new production tubes
are available, but most manufacturers continue to use new old stock. RCA was a prolific
maker of this tube. </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">Tubes, especially directly heated triodes, have the lowest distortion signature of
any amplifying device. Used in simple circuits, the 2A3 tube gives great clarity
in music. Its portrayal of musical tone, texture, and harmonics is superb. In a well
designed amp, the 2A3 brings music alive.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">Lyrita‘s 2A3 amps are single-<wbr>ended designs, as originally intended for this tube.
SET-<wbr> single ended triode. The circuits are simple, and use transformers extensively.
Amp configurations can be customized for the user.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">A new design uses the Russian 6S4P triode in the input / driver stage. This is a
high gain, high transconductance tube, which allows for a two stage design. This
simplicity gives more clarity in music. This tube reproduces the tonal richness in
music very close to that of DHTs, with excellent dynamics. </span></p>
<p class="Wp-Body-P"><span class="Body-C-C3"> </span></p>
<p class="Wp-Body-P"><span class="Body-C-C3">2A3 SET integrated amp</span><span class="Body-C-C2"> -<wbr> two stage, interstage transformer coupled. </span></p>
<p class="Wp-Body-P"><span class="Body-C-C4"> </span><span class="Body-C-C2"> Tubes -<wbr> </span><span class="Body-C-C3">6S4P, 2A3, 5V4G</span><span class="Body-C-C2">. Power output -<wbr> 3 watts/channel.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C3"> </span></p>
<p class="Wp-Body-P"><span class="Body-C-C3">2A3 SET power amp</span><span class="Body-C-C2"> -<wbr> two stage, interstage transformer coupled. </span></p>
<p class="Wp-Body-P"><span class="Body-C-C4"> </span><span class="Body-C-C2">Tubes -<wbr> </span><span class="Body-C-C3">6S4P, 2A3, 5V4G</span><span class="Body-C-C2">. Power output -<wbr> 3 watts/channel.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2">A more economical version of this amp is available, using smaller transformers and
a smaller chassis. The circuit is similar, using the same tubes.</span></p>
<p class="Wp-Body-P"><span class="Body-C-C3">Simple 2A3 SET integrated amplifier</span><span class="Body-C-C2"> -<wbr> two stage, capacitor coupled. </span></p>
<p class="Wp-Body-P"><span class="Body-C-C2"> Tubes -<wbr> </span><span class="Body-C-C3">6S4P, 2A3, 5V4G</span><span class="Body-C-C2">. Power output -<wbr> 3 watts/channel.</span></p>
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