This RARE and "ORIGINAL" TRIODE 4101D STANDARD TELEPHONE and CABLE (STC), the exact European correspondent of the 101D WESTERN ELECTRIC, among the first ever produced, can only be considered and included in the recognized and mythological " SAGA of VACUUM TUBES "! The Triode project for "AUDIO frequency" 101D TENNIS BALL, from its perfect balloon shape, is considered a perfect primordial and forerunner Audio tube, together with the other famous 205D also from the great parent company WE. The 4101D is absolutely perfect for circuits of Amplification and preamplification or any other DIY project. The splendid workmanship and robustness of this original vintage 4101D has no comparison with current productions and, in this regard, the fact that, nowadays, a "new" version is being proposed clearly makes us reflect on the excellence of this project of Western Electric (STC Europe). An impressive statement from WE about the 101D (=4101D) valve is this:
When the 101D valve is used in a device for which it was designed an average lifespan of up to 40,000 hours is possible. This excellent long life characteristic makes it very suitable for continuous operation where continuous service is desired. long and uninterrupted. The electrical characteristics of this tube are such that a moderate output power is obtainable with a small plate current and with a plate voltage under 200 Volts ."
The characteristics of the 4101D are similar to the 101F except that the 4101D valve absorbs a filament current of 1 Ampere instead of 0.5 A. The 4101D is a valve with almost absolute and ideal LINEARITY. like all valves of this era and typology, they are particularly fascinating, a presence, we would say, " mystical "! Year of production approximately 1918-21, so today, this valve boasts a splendid youth of over ONE CENTURY or more of life. We remind you that the filament is coated with " RARE Earths ". Naturally, needless to say, made and assembled entirely "handmade". Many early amplifier circuits used this tube, including Western Electric's own 7A AMPLIFIER . Today, these rare triodes are considerably sought after not only for their iconic history and for conservative restorations of equally museum-like equipment but also for esoteric DIY AUDIO projects. Aesthetically and physically it is in excellent condition, no dispersed particles, totally fixed base; exactly as visible in the photos.
The valve is a used FULL WORKING in ORDER . The test results to be fully functional with plate current exceeding the required level and Gm = 120%; verified with METRIX in compliance with the slope graphs (Characteristics Curves) with the following application data: Vh: 4.0 Volt, Vp: 130 Volt, -Vg: -8 Volt; must give an anodic current of 6.0 mA with a Gm of 1.0 mA/V.
EQUIVALENT: 101D WESTERN ELECTRIC = 208A = 101DW = VT31_GPO = CV1638 = CV1778 = SY4101D = 208A_Wecoltd = 101D_Wecoltd = R208-A = 101DW_Wecoltd
- THE ITEM WILL BE SHIPPED IN "DOUBLE BOX", OVERSIZED PACKAGING FOR MAXIMUM SAFETY !