mullard mc1 12ax7 / ecc83 / cv492 cv492 = military version of ecc83 = specially selected ecc83 Blackburn 1955 long plate Goal post square getter MC1 B5F IA 1.5 / 1.6 and GM 1.7 / 1.8 125%/133% and 106%/113% (new = 1.2 and 1.6) uk only please

For sale is a nice early example of the Mullard ECC83 with long anode plates and square getter. This example has fairly good print with all writing still legible and only minor rubbing. Coded MC1 and B7B, this valve was manufactured in the Mullard Blackburn factory in February 1957. This valve has been AVO tested on a recently calibrated VCM Mk4, a very close match between the two triode sections with the following results: A1: 0.8mA - 1.2mA/V A2:0.75mA - 1.2mA/V I have also listened to this valve on a setup which amplifies the ECC83 sections by 400x, this allows me to listen deep within the valve for any noises that could get worse and make themselves apparent later in use. This valve is free from any noise and sounds excellent. Overall a used but great working example of this early Mullard ECC83. Item will be well packaged for postage, offers are welcome.

Pair of Mullard Blackburn Long Plate Square Getter Valves/Tubes Tested on Hickok TV7-D/U Tester Tube 1) mC1 B6C Blackburn March 1956 CV492 KB/DA Tested 40 / 44 (80% / 88%) Tube 2) f91 B7K Blackburn August 1957 Tested 40 / 42 (80% / 84%) On Hickok TV7-D/U Tester min is 32 (65%) Worldwide Shipping Cost & US $25

Nos testing Siemens & halske ecc83. Matching etched codes - MC1 ? 7G balanced / matched 1: Gm 1888 / 1920 ma/V (NOS range on this tester is 1600 to 1900) Gain 98.8 / 97.4 Mu ( the gain range for ecc83 is 90 to 100) #2 Gm 1900 / 1950 Gain 100/102.3 Also tested in a dac and preamplifier . All good and they sound very nice indeed. Better sounding than mullard mc1 in my experience. Extremely rare. uk only

mullard mc1 12ax7 / ecc83 / cv492 cv492 = military version of ecc83 = specially selected ecc83 Blackburn 1956 long plate Goal post square getter MC1 B6J IA 1.35 / 1.5 and GM 1.5 / 1.65 113%/125% and 94%/103% (new = 1.2 and 1.6)uk only please

mullard mc1 12ax7 / ecc83 / cv492 cv492 = military version of ecc83 = specially selected ecc83 Blackburn 1955 long plate Goal post square getter MC1 B5F IA 1.5 / 1.6 and GM 1.7 / 1.8 125%/133% and 106%/113% (new = 1.2 and 1.6) uk only please

SUPER RARE EARLY MULLARD ECC83 12AX7 LONG PLATES SQUARE GETTER WITH CODE mC1 B7B - BLACKBURN FEBRUARY 1957 IN BEAUTIFUL CONDITION TESTED EXCELLENT ??AVO VCM163 TESTED READINGS TUBE 1 - Ia 2.2/1.7 gm 1.9/1.9 100% = Ia 1.2 gm 1.6 ? PLEASE SEE MY OTHER AUCTIONS ?

SUPER RARE EARLY MULLARD ECC83 12AX7 LONG PLATES SQUARE GETTER WITH CODE mC1 B5B - BLACKBURN FEBRUARY 1955 IN BEAUTIFUL CONDITION TESTED EXCELLENT - STRONG EMISSION BUT gm A BIT DOWN - PERFECTLY BALANCED ??AVO VCM163 TESTED READINGS TUBE 1 - Ia 1.35/1.35 gm 1.3/1.3 100% = Ia 1.2 gm 1.6 ? PLEASE SEE MY OTHER AUCTIONS ?

mullard mc1 12ax7 / ecc83 / cv492 cv492 = military version of ecc83 = specially selected ecc83 Blackburn 1956 long plate Goal post square getter MC1 B6J IA 1.35 / 1.5 and GM 1.5 / 1.65 113%/125% and 94%/103% (new = 1.2 and 1.6)uk only please

mullard mc1 12ax7 / ecc83 / cv492 cv492 = military version of ecc83 = specially selected ecc83 Blackburn 1955 long plate Goal post square getter MC1 B5F IA 1.5 / 1.6 and GM 1.7 / 1.8 125%/133% and 106%/113% (new = 1.2 and 1.6) uk only please

Nos testing Siemens & halske ecc83. Matching etched codes - MC1 ? 7G balanced / matched 1: Gm 1888 / 1920 ma/V (NOS range on this tester is 1600 to 1900) Gain 98.8 / 97.4 Mu ( the gain range for ecc83 is 90 to 100) #2 Gm 1900 / 1950 Gain 100/102.3 Also tested in a dac and preamplifier . All good and they sound very nice indeed. Better sounding than mullard mc1 in my experience. Extremely rare. uk only

AS FOUND, FROM RETIRED RADIO ENGINEERS WORKSHOP CLEARANCE.HEATER CHECKED OK FOR CONTINUITY,OTHERWISE NOT TESTED.Postage and packing UK £5, in EU 14 GBP, 22 GBP Worldwide This includes Tracking I will always combine postage on multiple items where possibleAll buyers are encouraged to pay via Paypal. The description is as accurate as possible and packaging is always sufficient, see my feedback for evidence. However there may be the occasion when problems arise, in which case if the buyer is not happy with the purchase every effort will be made to resolve the dissatisfaction. Typical feed back:- You know a really great seller when things go wrong and he takes care of it.

Nos testing Siemens & halske ecc83. Matching etched codes - MC1 ? 7G balanced / matched 1: Gm 1888 / 1920 ma/V (NOS range on this tester is 1600 to 1900) Gain 98.8 / 97.4 Mu ( the gain range for ecc83 is 90 to 100) #2 Gm 1900 / 1950 Gain 100/102.3 Also tested in a dac and preamplifier . All good and they sound very nice indeed. Better sounding than mullard mc1 in my experience. Extremely rare. uk only

(1) 80% Testing Mullard MC1 B8J 1958 12AX7/ECC83 Longplate Cage/SQ. Getter Guitar Audio Tube, Test at 37/38 with Min. Value being 32/32 or same as 65%, so this Tube Tests 80% Good Luck Bidding! (I NO LONGER SELL TO CHINA, VIETNAM OR INDONESIA DUE TO LOST PARCELS IN CUSTOMS, I DO NOT LOWER DECLARED VALUE OR WRITE AS GIFT ON CUSTOMS PAPER DUE TO US LAWS)

I have 2 Excellent strong MC1 Long plate Mullard 12ax7 tubes with the 2 support square D getter.