Why does the cathode resistor cause me to lose highs? - line level preamp
6u8a I have a pentode / triode as a preamp with line level. I'm having problems with the resistance at the cathode in the triode. What do you use the resistance, even high-end loose when this resistance in place. I use film resistors 1 / 2 watt metal. It would be a pure resistance of round wire, make a difference in this request?
Furthermore, I do not think using a filter capacitor, because I do not need all the extra benefits.
Finally, it seems to achieve much better results and linear, if I only the cathode, on the ground. I 1Volt a high resistance (1 meg) to land just before the grid when using the tube in this way with the network, which, incidentally, is the optimum voltage of the tube to help.
However, I wonder why I have problems with him, and I would suggest that you have to offer on this topic.
Thank you!
Sunday, January 24, 2010
Line Level Preamp Why Does The Cathode Resistor Cause Me To Lose Highs?
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4 comments:
No, this is the induction of resistance to WW too small to matter, and in general, the inductance would be more problems. The resistance to carbon layer has a very good response, far above the audio band.
A bypass plug small resistance will cause a net increase in high and can cause severe weight loss.
But I can not say into what caused the problem, which needs a full program of at least ...
Change 1:1-line input to XForm 50K pot. 350V to 170K, the resistance of the plate. 800ohm cathode resistor - have attempted to circumvent the CAP and that helped some.
170K is very high. If there is a capacitive load on it, you get an array of nodes. KHz, for example, only one role 100pF cause of 50% to 10. A shielded cable is more than that, for example.
In addition, the processor can easily get a discount.
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A clean wound wire resistance measurements will be in vain. With a filter capacitor to increase the profit, but not wanting to recover its tip.
Grounding the cathode, the probe is biased and a grid leak bias, depending on the amount of input that could pipe in the region of positive grid bias and non-linear amplifier.
Without a scheme that does not know what to say, but it seems to be a capacity too much ground on the signal path to have. Can a chart?
Cathod resistance is part of the bias network and is also part of the negative feedback to improve the sound quality. The greatest resistance, which has less gain. If you have more than 1k ohms capcitor without bypass, which reduces the gain of the higher frequency of AF. Choose the capacitor 0.01 to 0.05uF to improve the high frequency obtained. Reduce Cathod can get more profits, lost), but the sound quality (distortion.
Cathod resistance is part of the bias network and is also part of the negative feedback to improve the sound quality. The greatest resistance, which has less gain. If you have more than 1k ohms capcitor without bypass, which reduces the gain of the higher frequency of AF. Choose the capacitor 0.01 to 0.05uF to improve the high frequency obtained. Reduce Cathod can get more profits, lost), but the sound quality (distortion.
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