Mullard EL34/6CA7, Blackburn xf2 'O', Gm Test 114%, Curve Traced - (Tube 2of7)

Tube #2.
Mullard xf2, B8J3, Blackburn Plant, England 1968.
Copper grid posts, welded plate, singe round getter halo, hole in guide pin.
A1 condition, tight base, free from rattles and debris inside envelope.
Has seen very little use, very clean and very strong testing with beautiful gettering.

This tube is part of a group of 7 xf2 EL34 tubes currently listed, the tube numbers are in headings:
Makes a good pair with Tube #4 (109%, 114% Gm = 5% match).
Combined shipping is available.

Tested for hot/cold shorts and gas on AVO CT160.  Tested for Ip, Is, Gm, and curve traced on uTracer 3+, all measurements are very accurate and repeatable, filament supply (ext) is completely linear and not DC pulsed.  Full test data screenshots are also attached as images.

Mullard test points Vf 6.3, Vp 250, Vs 250, Vg1 -12.2 (100% values Ip 100mA, Is 15mA, Gm 11mA/V):
Ip = 94.5mA (94.5%)
Is = 15.2mA (102%)
Gm = 12.5mA/V (114%)

Plate curve characteristics trace as per the Mullard datasheet and a pentode free from electrode alignment defects.

Legendary EL34 type providing 1960's Mullard Blackburn EL34 xf2 tone - will suit the most discerning buyer.
Perfect for high-end audio or studio guitar sessions, your satisfaction is guaranteed.

This group of xf2 EL34 has been sitting in the cupboard and it's time for someone to enjoy them. Please check my other listings, I will be adding more over the coming months.

Tube/s will be well packed, tight tissue wrap without movement inside box to protect tube/s and or logo/s, test data on boxes, ships in oversized packaging to ensure safe arrival.

$20 fixed price standard air shipping with online tracking worldwide, typically 7-10 business days, often quicker. 
Over 250 sales, no missing or damaged items, everyone is happy with nil returns, please feel free to ask any questions.

I have 24 years of eBay experience and 100% positive feedback - buy with confidence.
** Items can ship as gift with no commercial value **