Loading... Please wait...
  • NOS NIB Siemens Germany EF800 [High End 6BX6] High End Microhpone Vacuum Tube

NOS NIB Siemens Germany EF800 [High End 6BX6] High End Microhpone Vacuum Tube

Ships in 1 business day or less.
Calculated at checkout
Current Stock:
Out of stock

Sorry but this item is currently unavailable.

Please check back at a later stage.

Product Description

Tube Type / Number: EF800 [High End 6BX6]
Actual Brand*: Siemens
Printed Brand: Siemens
Quantity: 1 Piece-Single
Matching Date Codes?
Plate Construction: Grey
Getter Construction: Top O
Country of Manufacture: Germany
Visible Date Codes: N72
Lettering Condition: 90 Percent
Number of Mica Spacers: 2
Mica Shape: Circle
Smoked Glass? Clear
Engraved Base? No
Boxes (always included): All Original
Notes: High End EF80/6BX6 Microphone Tube
Tested For & Matched By: Gm (General Mutual Transconductance)

Gm Test Results: 62

Minimum Good Value: 30
NOS Test Value: 48
Life Calculation: 100+% (where 65% = fail)

Tests as NOS?: Yes
True NOS?*: Yes

** Please note, many tubes will test NOS but will actually have a few hours of use on them. A truly NOS tube will have excellent getter flashing condition, no dirt/grime, usually in the original box, and no filament deposits. If a tube is listed  as "tests NOS" but is listed as "not True NOS" please expect the tube to have a small amount of use *

All tubes have been tested using only the best tube testers. We have a large fleet of tube testers, and every single one of them has been calibrated within the last year by industry experts. We mainly use the Hickok TV-7D/U, but occasionally we may use a Hickok 539, 533A, or 600A.


All of our tubes are 100% guaranteed to arrive as described, test as described and to be void of any sound defects. We offer a 30 day return window from the day you receive the item.

PLEASE NOTE - While we accept returns for basically any fault, we DO NOT accept returns for buyer's remorse which includes buyers who decide they don't like the subjective tonal signature of a tube. We have had people exploit our generous return policy to tube roll on our dime so we have a strict policy against this behavior.

Find Similar Products by Category

Product Reviews

This product hasn't received any reviews yet. Be the first to review this product!

Write your own product review

Recent Updates