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Message: <blockquote data-quote="Vanquish" data-source="post: 109203" data-attributes="member: 84">Saw a post on an old flame on Ebay ... the exquisite hybrid tube amp from the wonderful folks at US Amps (prior to the buy out) who happens to be one of best super high-end amp manufacturers based Florida, US. Their old school products were the stuff of legends and lovingly put together using only the best components available with cutting edge technology and sold in limited markets. The pursuit for numbers .... both in terms of financial returns and sales figures have sadly taken precedent these days and there may never be one like this baby ... ***********************************************************US Amps TU-4360 Hybrid Tube Amplifier.Conventional amplifiers use the same component(s) to amplify voltage and current from a "line" or preamp level to an audible "speaker" level. This includes the introduction of part of the signal slightly out of "time alignment" for the purpose of retarding high frequency response, thus stabilizing the overall circuit. These "Negative Feedback" loops can be local (contained to one critical part of the circuit), or global (pertaining to the audio output as a whole).The introduction of negative feedback is detrimental to sound quality as it introduces a certain "harshness" into the character of the sound. This is particularly true in fast-switching transistor circuits that already contend with the emphases of odd-order harmonics that are a product of their design. Tube circuits generally fare somewhat better in the presence of negative feedback. The higher voltage and slower operating speed of a tube naturally emphasizes pleasing even-order harmonics.Traditional tube amplifiers produce high voltage which is excellent for transience, attack, transparency, and staging, but are severely limited by the amount of current available to drive speakers. The final stage of a traditional tube amplifier is an "output transformer" which transforms some of the voltage energy into current. The resultant signal is better suited to drive an audio loudspeaker, but a great deal of the original tube dynamics and frequency response are lost forever.With our VTCSD (Vacuum Tube Current Sync Drive) input signal is fed DIRECTLY into the tube. There are no solid state gain stages or processors in the signal path. The original high voltage tube signal is joined by a null-gain current "following" circuit that is pulled to the voltage rails by an opposing pair of "current syncs", providing a sort of "amplifier power steering" to deliver speaker-driving power without taxing the character of the original tube voltage content.SpecsTU-4360  - Four Channel Class A Amplifier Direct Tube Input / No Onboard X-OversOversized MOSFET Power Supply Total Power Output:  360 Watts RMS THD at Rated Power:  100dBA Frequency Response:  15Hz-50KHz +/-0dB Fuse Rating:  40 Amps Dimensions: (Including Terminals)62mm /  2.44in   High   229mm /  9.0in   Wide   368mm /  14.50in   Long    Weight: 3.63kg / 8.00lb Two Ohm Stable 75 Watts x 4 into 4 Ohms 90 Watts x 4 into 2 Ohms  And just how does this baby look like naked ??? See the attached pic ...Cheers,VaN.P/S - BTW, I'm bidding for her .... keeping my fingers crossed.</blockquote>

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