Wa33 employs a true fullybalanced design featuring 6c45 driver tubes, four 2a3 power tubes, and 274b rectifier tube, all in directheated triodes to reveal the. The woo audio wa7 fireflies ampdac is a combination of high performance vacuum tube headphone amplifier with a builtin usb digitaltoanalog converter. Pure tube design without the use of semiconductors in the amplification circuitry. This headphone amppreamp uses four 6c45 tubes as the drivers for four rather large 2a3 power tubes used as directheated triodes. Single ended classa power amplifier using 6c45pi the valve itself, have a simple circuit enviable any transistor amplifier, however, not many projects that employ a single active component. It is a fully balanced, tubebased unit comprising two chassis that are. The formidable wa33 tube headphone amplifier from woo audio, their new. The new 6c45 sovtek tube the best discover ive recently made is the new 6c45 tube. Wa7 fireflies 2nd gen headphone amplifier dac woo audio. Woo audio wa7 fireflies tube amplifier the headphone annex. The 6c45 is also excellent as driver for big transmitter triode as vt4c211, 845. It has a 20 percent higher output than the sovtek 5881wxt. Follows the photo of the common vacuum tubes used like driver in power amplifier.
Wa33 fullybalanced headphone amppreamplifier woo audio. Further, a parallel cathode follower of 45s has only 10ohm of output impedance. Replacement stock vacuum tubes for woo audio amplifiers. This is what i found about the 6c45 used in my r10h. There are no semiconductors used in the entire amplification path.
It is a pure tube design which uses two 6c45 vacuum tubes in a class a. Woo audio wa7d fireflies vacuum tube headphone amplifier with. This is a real 6973, not a rebrand of a close tube. It is a pure tube design, utilizing 6c45 tubes in a classa, singleended topology, with transformer coupled outputs. Woo audio wa33 fullybalanced headphone amppreamp a. The woo audio wa7d fireflies 192khz32bit dac tube headphone amplifier answers. This tube features larger plate dimensions and improved grid structure for increased power handling capabilities. From the 1st moment i saw the specs ive recognized this will.
The 6c45 pe is a low power triode 8 watts max for the p d paramenter. Beam power amplifier used in vintage gretsch and magnatone amplifiers. It also features mica spacers with metal springs to eliminate tube rattle and microphonics. There are no semiconductors used in the entire signal path. The woo audio wa7 gen 2 fireflies ampdac is a combination of high performance vacuum tube headphone amplifier with a builtin usb digitaltoanalog converter. The unique voltage amplifier stage drives without problems the 211s grid pemitting also a soft a2class mode of operation.
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