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New 2025 SILK Supermalloy
Grid Choke
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| The highest inductance Grid Choke with lowest DCR and lowest capacitance. Replacing your grid leak resistor with our new SILK Supermalloy Grid Choke is one of the easiest improvement you can do by yourself. Our Grid Choke can be characterized as "The Ultimate Inductor" since its inductance is more than 7,000 Henry at 12Hz while having very low DCR of just 1K + 1K ohm. The center tap allows phase conversion (phase split) for push-pull circuit. |
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| In Grid circuit, it is preferred to have: 1) The lowest DCR component to suppress noise (low impedance). Imagine you connect grid pin to ground, you essentially form zero ohm grid circuit. This low impedance will not introduce noise. However the audio input signal also goes to ground. No signal is available for the tube circuit to amplify. 2) High AC impedance (light load) to form easy load for the driving circuit. If the impedance is too small, it will over-load the driving circuit and will cause high distortion and low bandwidth. 3) The lowest capacitance across grid circuit. The first two preferences create dilemma and compromise if you use regular Grid resistor because the impedance and resistance are the same. The most economic way is to use between 50K ohm up to 500K ohm a grid leak resistor to provide grid leak bias action while not loading too much of the driving circuit. Compromising between noise and load are there in every circuit design. However with our new Supermalloy Grid choke, its immense inductance (high impedance) yet very low DCR only around 1K+1K ohm create no compromise design vacuum tube amplifier circuit. |
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AC impedance at 1KHz of our new SILK Supermalloy Grid Choke is more than 5 Mega ohm!
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Not only our new Supermalloy Grid Choke has highest inductance and lowest DCR, it also processes one of the very important asset in grid circuit parameter, it has very low parasitic capacitance of only less than 20pF. This is a 10 to 1 lower capacitance as compare to standard grid resistor. Immediate improvement in high frequency response.
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A normal 100K ohm grid resistor can have as much as 200pF of parasitic capacitance that always shunts away high frequency response in your circuit.
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| Silk Grid Choke |
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Model
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Value
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Type
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Price
(THB)
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GC-1A
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more
than 7,000H at 12 Hz
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Open
bracket
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5,500THB/Pair
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