Brimar
True NOS Date & Gain Matched Pair Brimar - CV4004 [12AX7 ECC83] Box Plate Tubes
- SKU:
- PP0504
- UPC:
- Brimar 12AX7/CV4004
- MPN:
- Brimar 12AX7/CV4004
- Availability:
- Ships in 1 business day or less.
- Shipping:
- Calculated at Checkout
Description
Tube Type / Number: CV4004 [12AX7 ECC83]
Actual Brand*: Brimar
Printed Brand: Valve Electronic
Quantity: 2 Pieces-Matched Pair
Matching Date Codes? Yes
Plate Construction: Grey Wing/Box
Getter Construction: Top O
Country of Manufacture: England
Visible Date Codes: XE KB/AD
Lettering Condition: 90 Percent
Number of Mica Spacers: 2
Mica Shape: Saw
Smoked Glass? Clear
Engraved Base? No
Boxes (always included): All WB/Generic
Notes: Gain: 94.8/93.6 & 88.8/90.3
Tested For & Matched By: Gm & Gain on a Maxi-Matcher Preamp @ real world voltages
Gm Test Results: 1741/1709 & 1797/1844
Minimum Good Value: 975/975
NOS Test Value: 1500/1500
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.
Returns
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.