71A NATIONAL UNION JAN CNU UX171A...
71A NATIONAL UNION JAN CNU UX171A...
71A NATIONAL UNION JAN CNU UX171A...
71A NATIONAL UNION JAN CNU UX171A...
71A NATIONAL UNION JAN CNU UX171A...
71A NATIONAL UNION JAN CNU UX171A...

71A NATIONAL UNION JAN CNU UX171A CX71A 471A PAIR VALVE TRIODE DHT FINAL POWER AMPLIFICATION AUDIO NOS/NIB

N0071ANUN
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€349.90
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The 71A is the forerunner of the 45 power amp, undoubtedly one of the most interesting Triodes in the AUDIO field. Perfectly matched NATIONAL UNION pair!

Description

The 71A valve is a classic TRIODE of output power for AUDIO amplification that appeared in the first half of the 1930s, used in the low frequency final stage of radio equipment. Its quality and its level of linearity, in more recent years, have made it very famous also for extraordinary devices, DIY projects and more, HI-FI and HI-End. The Triode 71A is the forerunner of the even more famous Triode 45 which in turn is the smaller sister of the ultra famous Triode 2A3. This is a PERFECT and exemplary PAIR of 71A JAN CNU NATIONAL UNION, genuine produced in the USA, totally NOS/ NIB, produced for US Military supply, therefore excellent quality. Absolutely identical valves, admirable structure with very robust " silver " striped plate, completely similar to the 45 (a few millimeters smaller) and double structure for suspension filament spring. Same code on the base. TOTALLY coupled. Harmony and dynamics in a tube.

EQUIVALENT: UX171A = CX371A = CX71A = TC171A = AC4 = NX-71A = 171A = SX171A = JX-171A = SLX171A = UX-71A = ER71A = ER171A = X-171A = DX-171A = VX171A = AX-171A = 471A T-71A = MX171A = RayX-171A & SUBSTITUTE: M71A and 38071 = AC-116 = U171

DATA-SHEET file at the bottom of the page.

Product Details

Brand / Manufacture / Plant
NATIONAL UNION / USA
Model / Type
71A / UX or CX171
Code / date manufacturing
G5 and 43-22 (on plates) WL/1940 circa
Conditions
NOS / NIB - NEW - NEVER USED
Physical characteristics / Relevances
SILVER plate, Spring suspension filament
TESTS (Detected Values) / Data Sheet Reference
REFERENCE 71A: (Ia) 20.0 mA with (Gm) 1.7 mA/V (METRIX manual parameters)
TUBE1: (Ia) 28.5 mA with (Gm) 2.5 mA/V - 147% Emission
TUBE2: (Ia) 30.5 mA with (Gm) 2.5 mA/V - 147% Emission
Usage
Output power , Driver , Radio equipments
Recommended for
AUDIO (Out-put and Driver) , HI-FI set , Radio
STARS / RATE (Rating from 1 to 5)
5
1 Item

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