Perfect OTL Headphone Amplifier ----- OTL Headphone AMP

This tube OTL headphone amplifier is based on the former version (see the top tube OTL headphone amplifier), its voice is very "real", rich in detail, you can listen to CD player and CD film the quality of. Here, I will pursue the perfect sound in an uncompromising attitude so that it can be used as a preamplifier, driving any type of amplitude, which has sufficient output amplitude, sufficient gain (approximately 30dB) and very low output impedance ( About 30 ohms). Fig. 1 is a circuit diagram of one of the channels. For the principle, please refer to the top tube OTL headphone amplifier. The improvement of this unit focuses on the careful selection of components, and the use of rectifier diodes and cancellation of coupling capacitors. Be If you are marked in the circuit diagram, please have to use a 2W AB carbon film resistance. The bypass capacitor is ELNA CERAFINE, of course, the price of Black Gate capacitors is better. I have not tried Black Gates, but I know it (I read in many articles) Black Gates needed to make a good hour, and every day, it will be turned on. I have tested different electronic tubes for the magnification of the Aquarium, like Jan-Philips 5814, Jan-Philips 5687, Mullard E182CC, JAN-Philips 6SN7 and RCA 3a5 heated double triodes. I found that the Raytheon 5842 high MU tube is the best (Jan-raytheon 5842wa). The output stage is a parallel three-pole cathode outputter. I only tried E182CC and E288CC. I use Mullard E182CC, it is recommended to use Mullard, Jan-Philips or Siemens tube. Be Be Figure 2 is a power supply circuit diagram. Using electronic tube rectification to achieve a perfect effect. I tested Jan-Philips 5Y3 and RCA 5R4, it is recommended to use two 5Y3 or one 5R4. Only the first capacitance after the rectifier is an electrolytic capacitor, or a better oil immersion paper dielectric. The DC impedance of choke should be less than 70 ohms, remember! The filament is powered by communication. I am developing a conversion device for the same country like I live. Here, the morning voltage is as high as 230 volts, and the evening is as low as 196 volts. In my previous article, I gave a very good DC filament power supply, but in the experiment, the voice of AC power is better. In order to avoid the sound of the switch, wait for 30 seconds after booting and then plugging in the headset. Perhaps the output is added to add a delay relay. Be Be Be The frame of the cabinet is made of walnut, with a size of 53 cm x30 cm x5 cm. The above is a 3 mm thick aluminum plate. All inputs, the output sleeve is gold-plated. Additional star hunters in photos are used when testing 6SN7.

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