Με 2.5 χιλιάρικα ο άλλος αγοράζει HiEnd καλώδια, οπότε τα 2,5 για δύο κορυφαίες λυχνίες νομίζω ότι πιάνουν περισσότερο τόπο.
Πρώτα ας δούμε κάποιες σχεδιαστές προσεγγίεσεις στο θέμα SET
http://www.stereophile.com/amplificationreviews/740/
Και το review του Cary CAD-1610 SE, από το Stereophile
http://www.stereophile.com/tubepoweramps/1200cary/
Circuits Matter
The basic circuit design of the CAD-1610-SE is used in many of Cary Audio's pure class-A single-ended triode designs. And the new KR T-1610 low-mu audio power triode allows, it is said, for a very-low-distortion implementation of this basic topology. Output power is rated at more than 100W "peak envelope power," the steady-state continuous sinewave power at 55W RMS into loads of 8 or 4 ohms.
Each CAD-1610-SE amplifier has two separate high- and low-impedance bias supplies, so there's no need to worry if the lower amplifier section, carrying the T-1610, is mistakenly powered up without the bias voltage being supplied by the 300B. Dennis the Tube Menace: "The high-impedance bias supply automatically controls the T-1610's plate current. The actual operating bias is supplied from the driver section on the top chassis to the T-1610 output tube."
The "specially designed" output transformer is an air-gap design with full continual bias. Had considers the output transformer an amp's most important component. This one's wound with oxygen-free copper wire, with "portions" of the primary and secondary windings done in what's called a bi-filar process: two inductors interleaved; in this case, 26 times.
"The bi-filar wind," clarifies Had, "yields the closest balance and coupling of any design currently used in vacuum-tube output transformers. The EI Laminates are silicone-impregnated hypersil steel, which contributes to extremely low loss and a seductive midrange!" Man, he knows how to go around a curve! The design is similar, he proudly claims, to the single-ended air-gap transformers in all Cary single-ended output transformers.
Here's the audio circuit, for all you kitchen-table designers: The audio drive signal is applied to the control grid of an input 6SN7 dual-triode tube. The second 6SN7 operates in the first tube's anode circuit, supplying operating voltage and current. After the signal is amplified by the 6SN7, the output anode section is directly coupled to the grid of the 300B triode gain stage. According to Had, this type of direct coupling eliminates the need for a coupling capacitor and a bias supply on the 300B. Rather, the 300B's gain stage is supplied voltage on the anode by a high-inductance voltage choke.
