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Summary of Contents for First Watt J2
- Page 1 First Watt model J2 Power JFET Amplifier...
- Page 2 Sony and Yamaha from more than 30 years ago. The details of the First Watt F3 are found in the owner's manual (and the DIY articles Zen Variations #8 and #9), and the charms of the amplifier's sound can be found in the many reviews.
- Page 3 These are the lowest distortion big power transistors I have seen. To give you a sense of the of the difference, Fig 1 shows the distortion between two different transistors operated under identical conditions in a First Watt F2 amplifier: Here we see the popular IRFP240 N channel Mosfet (top curve) versus a...
- Page 4 The input stage uses parallel Toshiba 2SK170 and 2SJ109 JFETs for both the current source and the differential input (the parallels are shown as single in the drawing). The J2 is a nice blend of parts that are not yet available and parts that are no longer available.
- Page 5 Better sounding amplifiers. Read the brochure if you don't believe me: “The J2 has a sound which is warm and relaxed, combining precision and detail without sterility. With a pair of sensibly efficient loudspeakers, it will give you a toe-tapping experience that other solid state amplifiers do not.”...
- Page 6 So Congratulations. You made a great choice. Now I'm going to show you some stuff that is perhaps not already apparent: Here's the distortion into 8 ohms at 1 Khz from 0.1 watts to 30 watts Here's the distortion into 4 ohms at 1 Khz...
- Page 7 Here's the distortion into 8 ohms at 1 watt from 20 to 20 Khz Here's what that second-harmonic distortion looks like...
- Page 8 Here's the frequency response from 10 to 100 Khz Here's the square wave at 20 KHz...
- Page 9 1 and 3 of the balanced XLR connector, or you won’t get any gain. If you lose the jumper, contact First Watt and I will send you a pair. The XLR balanced input has pin 1 = ground, pin 2 = (+), and pin 3 = (-).
- Page 10 The J2 has enough damping factor at 20 to work well with loudspeakers that mate well with tube amplifiers in general, and it delivers good performance into 4 ohms also –...
- Page 11 AC voltage, contact First Watt. Once Again: If you have a problem, contact First Watt. We are much happier helping you solve problems so that we can be certain that it’s done properly. If you are far away and don’t want to ship the product for repair, we will assist your technician with information and parts.
- Page 12 Summary of the nominal specifications: Measured at 120 V AC and an 8 ohm load: Distortion @ 1 watt .025% @ 1 KHz, Input Impedance 100 Kohm Balanced input CMRR -60 dB @ 1 Khz Gain 20 dB Input Sensitivity 280 mV = 1 watt, 1.4 V = rated power Damping Factor Output power 8 ohms...
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