- The Pinnacle is also a 2-stage amp using a 6SN7 capacitively coupled to the PX4. The input and output are electrically balanced and coupled through transformers but the amp is single-ended. It is capable of driving close to 10Vrms into 32Ω or higher. The manufacturing cost difference between the Peak and Pinnacle is enormous.
- Apr 18, 2015 · But getting the fully-balanced WA22 headphone amp in-house really shored up my gear lust. Thanks to the good graces of Woo Audio’s Mike Liang, I received for review a black WA22 ($1995) with the optional upgrade tubes, a GE 6080, a Westinghouse 6SN7 and Sophia Princess 274B tubes. The Sophia rectifier, which is available from Woo for an additional charge of $160, is a serious work of art, the kind of thing that provoked visitors to stop and study the rack and say things like, “What IS ...
- (4) Good for money tubes* 6AS7/6080/6N13 power tube. close to unity gain and low output impedance make this ideal for headphone amplifier. A proven favourite with OTL users too. In good supply and low cost. * 12AU7 x 2. We all know this tube. Easy rolling and sound meshes very well with the 6AS7.
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