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811A NOS RCA Bundesamt BWB EAGLE POWER TRIODE MATCHED PAIR
811A NOS RCA Bundesamt BWB EAGLE POWER TRIODE MATCHED PAIR
 
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Product Code: RCA BWB 811A PR
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811A NOS RCA Bundesamt BWB EAGLE POWER TRIODE MATCHED PAIR

NOS PHENOMINAL ESOTERIC 811A w MILITARY TOP MICA DESIGN

with

BWB INSIGNIA WESTERN GERMANY

811A NOS RCA Bundesamt BWB EAGLE POWER TRIODE MATCHED PAIR

NOS RCA 811A RARE OLD POWER TRIODES COME IN MATCHED PAIRS DESIGNATED BY THE WEST GERMAN DEFENCE PROCUREMENT AGENCY "BWB"

Bundesamt für Wehrtechnik und Beschaffung (BWB) these quality tubes were supplied to the BWB and were plate matched in Germany in groups of 12 tubes.  You receive one matched pair (2 tubes).

BWB Quality assurance - http://www.bwb.org/portal/a/bwb
If these tubes were stamped with the BWB Eagle you know you are getting the Best possible 811A matched pair.
All tubes identicle inner-construction as displayed in photographs
Rare "D" Getter tubes made long ago however preserved in pristine condition
Rare TOP-MICA directly above the top CERAMIC SPACER NOT SEEN in other offers
RARE "WINGED" HEAT-SINK DESIGN FOR COOLING PURPOSES
"BWB" ISSUED EAGLE TUBES NOT FOUND ANYWHERE ELSE IN THE WORLD!
ONLY 4 MATCHED PAIRS ON THE FACE OF THE EARTH and that's all folks!

TubeMuseum tested tubes takes the guesswork out of the process of selection delivering you the best Audio tubes that there possibly can be.

TESTED AT REAL-WORLD POWER LEVELS

These are Germany BWB Military tested tubes, no one else knows how or has the gear to test the 811A properly as most tube testers others have do not have 4 amperes of heater current.

The 811A needs 4 amperes of heater current with both separate 4A heater current, and regulated, buffered, positive DC bias and test signal.

AC Plate Voltage RMS is tested @ 1750 volts

Pair 1: 68mA/68mA (SOLD 16-AUG-2011 G.S.)

Pair 2: 68mA/68mA (SOLD 16-AUG-2011 G.S.)

Pair 3: 67mA/67mA

Pair 4: 67mA/66mA

65mA = 100%

The Best "D-Getter" 811A in the World!

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