Philips ECC83 /12AX7 Black Plate Made in Holland Amplitrex Tested Qty 2 Pcs

Philips ECC83 / 12AX7 — Matched Pair Vintage Black Plates

Rare Black Plate Construction
Top Ring Getter
Made in Holland
Amplitrex AT1000 Verified

Up for sale is a matched pair (2 pieces) of premium Philips ECC83 / 12AX7 vintage vacuum tubes. This set features the highly sought-after Black Plate internal structure and Top Ring Getter, hallmarks of mid-century Dutch tube manufacturing excellence.

Both units have been professionally screened on an Amplitrex AT1000. These tubes exhibit high emission and mutual conductance (Gm) levels, qualifying them for our Gold Grade designation, ideal for high-end phono stages and preamplifiers.

Serial No.	Test Triode	Parameter Ip mAdc	Result Ip mAdc	% Ip	Parameter Gm uMhos	Result Gm uMhos	% Gm
#1181013	T1	1.2	1.0	83.3%	1600	1600	100.0%
	T2	1.2	1.1	91.6%	1600	1700	106.2%
#1181014	T1	1.2	1.3	108.3%	1600	1580	98.7%
	T2	1.2	1.4	116.6%	1600	1610	100.6%

Technical Note: Percentage values are calculated against original factory NOS (New Old Stock) specifications: 1.2mA for Plate Current (Ip) and 1600 uMhos for Mutual Conductance (Gm).

International Buyers: Please note that customs duties, local taxes, and VAT are not included in the purchase price and are the responsibility of the buyer.