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|  CITAZIONE (abanoise @ 12/11/2007, 00:22) Ed ecco la testata dei miei sogni... Se a qualcuno dovesse capitare, scambio volentieri con Sunn Concert Bass! Olè! Con questa segnalazione (che non conoscevo) ho scoperto un sacco di cose interessanti. La Beta Lead (o Beta Bass, è la stessa cosa) è una delle primissime testate a transistor realizzate con tecnologia MOS, e questa addirittura con C-MOS! (non sapevo che ci fossero teste realizzate così, con circuiti digitali) Ed è del 1979... Un paio di cose interessanti circa i controlli della Beta Lead/Bass dal sito Sunn Ampage: CITAZIONE Tone control is not provided by a traditional tone stack, so forget all about your favorite settings from those other amps. The Beta Lead tone controls are not interactive and are best used by thinking of them as a 3-band equalizer.
The Bass and Treble are "shelving" controls and function more like individual volume controls for their frequency range. The Mid control, in addition to adjusting the level of middle frequencies, also changes the bandwidth - broad down low and sharp up high. The best approach to finding a suitable tone setting is to start with these controls on "5", and adjust from there based on what your ears are telling you.
The Reverb on the Beta Lead is different from most amps. The Reverb control does not adjust the level of reverb!! The Reverb control functions as a "DWELL" control (for those of you that have used a 3-knob reverb unit, you know what I mean). Dwell controls how hard (or soft) the reverb unit is driven. More drive means a longer overall decay time and more re-echoing of the signal through the springs. With more drive it sounds like the reverb is being created in a larger space. Dwell can be thought of as providing control over the illusion of "room size".
The volume level of the reverb is more or less PRESET and bypasses the channel Level controls. Yes, the Level control does adjust the volume of each channel. However, if you are using the Reverb effect, this adjustment also determines the "dry" signal level that gets mixed with the reverb signal. [...]
The range of Beta Lead reverb effects can vary from an apparent size of an enclosed garage to wide open canyon - it is simply AMAZING!! Parziale OT elettronico, a chi interessa: CITAZIONE The Beta series uses a 74C04 digital chip, sometimes called a hex inverter, in the circuitry around the drive control. This chip is manufactured using "Metal Oxide Semiconductor" processes which gives us the MOS. The "C" in front of C-MOS stands for "Complementary" and means that each of those six inverter units inside the chip are made using both n-channel and p-channel FET (Field Effect Transistor) devices - in order to obtain the high gain and low power consumption required of digital devices.
Sunn was one of the earliest amplifier pioneers to use FETs in their solid-state amps to make them sound closer to a tube amp. [...]
By applying feedback through a resistor, the extremely high gain of the inverter is reduced and it becomes a very linear analog audio amplifier stage!!
If this sounds familiar, you might recall that Craig Anderton in his book "Electronic Projects for Musicians" presented his "Tube Sound Fuzz" built around a hex inverter chip. Electro Harmonix produced a distortion device called "Hot Tubes" which also used a hex inverter. [...] Nota: i controlli di tono dell'Hot Tubes, "Bass" e "Treble", sono anche loro filtri Shelving (in pratica, filtri con guadagno). |
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addizionale?!