6p15 electronic management OTL amplifier ----- 6p15 Vacuum Tube Amplifier

Keywords: 6P15 electronic management OTL amplifier The author is as a fascinating temptation, and the black and white TV power transformer will be eliminated into ambiguous output transformer to make a low-cost courage, but the transformer needs to be removed and renewed and immersed, in amateur It has a certain difficulty under conditions. The author has newly produced a quasi-OTL circuit electronic pipe power, still uses 31cm black and white TV power transformers to output transformers. Since the OTL output circuit is used, the transformer's primary has no DC, so the transformer does not need to be transformed, can be used directly. Since the output transformer is retained, this circuit can only be called quasi-OTL amplifier, but the characteristics of the amplifier use of the transformer output are still kept. As shown in the figure, the V1 front voltage is placed in, the V2 distribution inverted phase, the V3 and the V4 OTL push-pull output, and the output capacitor CL uses a polypropylene capacitor having a withstand voltage greater than 250 V. Since the output transformer has no DC pass, the original 220V winding and the 17V winding are connected in series into a self-procedure, and the 17V windings are connected as the secondary to the 8Ω speaker. V1 and V2 use a double diode 6N1, V3 and V4 to use two 6p15 to be used as a triode. Since the parameters of the two 6p15 are not exactly the same, the V3's screen voltage reaches half of the B + voltage by adjusting the cathode resistance R * of V3, that is, 155V. The power transformer of this unit comes from the eliminated six-lamp radio, V1, V2, V3 filaments use a set of 6.3V power supplies, and the center tap ground, while the filament of the V4 uses a group of suspended 6.3V power supplies. Because there is no need to restructuring, it can easily use various transformers as the output transformer of the unit to compare their impact on sound quality. The author's experience is that the transformer tone of the EI core is relatively warm, and the transformer tone of the C-core is relatively clear. The author has used a C-type transformer with a power capacity of 40W, a secondary voltage 1 2V, connect the secondary to 4Ω speakers, transparent tone, and unique warmth, the effect is quite good.

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