The 18S100 Choke
Vacuum tube amplification has a long and fascinating history of sonic fidelity and distinctive character. Among the many key components that contribute to an immersive and detailed sound, the choke plays a fundamental role—especially when implemented in a parafeed configuration. In this context, we proudly present the 18S100 Choke, a robust and reliable component that opens new possibilities for high-quality audio enthusiasts.
The 18S100 is a high-quality choke designed to excel in tube amplification. With a nominal value of 100 Henry and the ability to handle up to 40 mA of continuous current, it stands out as a versatile and powerful element for those seeking a rich and detailed sound in their audio systems.
What Is Parafeed
Parafeed is a unique configuration in tube amplification where the choke takes on a central role as the anode load. In a triode stage loaded with an inductance in parafeed, the 18S100 Choke plays a key role in shaping the amplifier’s frequency response and linearity.
A fascinating aspect of parafeed is its direct impact on the gain of the tube stage. In particular, the gain of a triode stage loaded with an inductance in parafeed approaches the Mu value of the tube used. This connection between the tube’s intrinsic characteristics and the parafeed configuration contributes to a more accurate and controlled sound reproduction.
Practical Applications
The 18S100 Choke lends itself to a wide range of audio applications, offering an ideal anode load for tube stages that require precise DC current handling and an extended frequency response. Whether you are designing a hi-fi amplifier or a tube preamplifier, the 18S100 provides a key element for optimizing audio performance.
The versatility of the 18S100 becomes especially evident when used in preamplifier stages or as a driver stage for power tubes. Thanks to its ability to handle higher currents, the 18S100 offers an ideal option for audio projects that demand precision and flexibility in various configurations. Integrate the 18S100 into your audio designs and discover how this innovative component can elevate your listening experience to new levels of performance and satisfaction. Whether you are building a high-end preamplifier or designing a complete amplification chain, the 18S100 stands out as a reliable choice for audiophiles seeking superior sound quality.
The photographs are representative of the product, though slight variations in paint finish, wire color, or bobbin appearance may occur. Transparent varnish versions are also available. However, the general appearance and main characteristics remain consistent with what is shown in the images. In addition, all products listed are subject to quantity discounts. When purchasing inductors together with other products such as output transformers, power transformers, or any other items available on the website, you can benefit from significant savings compared to the single-unit cost, as indicated by the ratios below.
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Universal Anode Load Choke, Nominal 100H (80H @ 100 Hz / 115H @ 1 kHz), Max 40 mA DC, DCR 750 ohm Test conditions with tube 6J5 (or one section of 6SN7) – Ri = 7700 ohm – bias current 5 mA – cathode bypass 220 µF – frequency response 25 Hz – 60 kHz at –3 dB. Test conditions with one section of 6BX7 – Ri = 1650 ohm – bias current 20 mA – cathode bypass 2200 µF – frequency response 20 Hz (flat) to 80 kHz at –3 dB. The choke withstands up to 40 mA DC with only a slight decrease in bandwidth. It can be used with any triode or pseudo-triode having an internal resistance (Ri) equal to or lower than 7 k ohm. With triodes or pentodes having higher Ri, a slight low-frequency attenuation may occur unless compensated by a small amount of local feedback. |
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