6c19 is a triode which has low internal resistance in the thumb tube and high power. #40;6W#41; 6p1 6p14 6p15 6p6 6F1 6F2 6F3 These tubes are only 3-5W. If the circuit is used properly, the output transformer process can be said to be A very rare good tube!
For many years, there has been a wish to make a low internal resistance tube in the domestic tube, 6P13300B6N5P these low internal resistance have been done. After that, I chose to make the internal resistance of the transistor 6C19 only 300Ω; , The experimental debugging is finally completed! The power can reach 6W. The bass effect of such a small tube is so shocking, this is the characteristic of 6C19! The sound is comparable to 300B!
In the principle of simplicity and supremacy, or pure manual scaffolding welding, it was decided to use one of the 300B high-heat circuit forms, that is, the first-level pentode is placed in front of the first-level power tube output. At the same time, in order to achieve visual harmony, the eyes of the pentode are selected and locked on the small seven-legged tube 6J1.
Because the gate negative voltage of 6C19 is relatively high and the driving voltage is required to be high, when considering the circuit, I was inspired by an article in a magazine. This article introduces the use of the 6K4 push tube 300K of the early tube radio. The effect is surprisingly good. In the fever circle, it has long been said that the triode can complement the advantages of the triode, so the pentode 6J1 and 6C19 with higher transconductance, larger screen consumption and larger anode current are used.
The characteristics of 6C19 can be comparable with 2A3 300B, the key lies in the reasonable choice of working state. The internal resistance of 6C19 is lower than 2A3, but the transconductance is higher than 2A3, and the 17th amplification factor is slightly lower than 2A3. This point is that 6C19 is more difficult to drive!
6C19 filament 6.3V1A, the volume is the same as 6P1 General size 6P1 filament current: 0.5A 6p6p filament current 0.5A Even the 6P3P filament current several times larger than 6C19 is only 0.9A. It can be seen that the current in the thumb tube is large, and the internal resistance is #40; Even lower than 13P#xff08;460Ω;#xff09;, 300Ω; for tubes with low internal resistance, the lower the internal resistance of the tube, the better the sound, such as 6N5P6P13P300B, etc., #41;
Screen flow 110mA tube consumption 11W
The triode 6C19, which is rare in the thumb tube and capable of power amplifier, has low sensitivity and high gate negative pressure, so a higher amplitude voltage is required to drive it.
This machine uses 1 power transformer, 2 output transformers, an inductor, a total of 4 transformers
version 1: US Teflon Ferry Silver Link #41;
version 2: American Teflon silver plated wire link with tube shield #41;
version 3: Increase the power transformer and use 0.35 pieces, the heat is lower! Guaranteed! More dynamic!
Rated output power: 6W*2
Frequency response: 20Hz--25KHz
Total harmonic distortion: 1%#xff08;1kHz#xff09;
Input sensitivity: 500mV--2000mV
Input impedance: 100KΩ;
Output impedance: 4Ω;, 8Ω;
Signal to noise ratio: 88DB
size：220x200x150mm
Weight: 6.5KG
All internal wires are connected with Teflon silver-plated wires. The filter capacitors are Dutch capacitors. Taiwan produces high-precision metal film five-ring resistors! The secondary filter is South Korea Sanying or Japanese Ruby inductive filter, the noise floor is very small, only close to the speaker to hear!
