This particular tube tests very strong, although it’s not the most balanced tube. Often square-getter Mullards are associated with mC1 production codes, and the halo-getter tubes with f91 and later codes. Oddly though, this particular tube has an f91 code AND a square-getter. The f91 code on this tube is Extremely faint, and is almost impossible to see with a naked eye even under good light (and even more difficult to photograph, but I think I managed to barely capture it with a back-light enough to sort-of see it’s faint outline). The print on the tube is very fragile and will easily rub off, some has already rubbed off, special care was taken not to rub off any more while testing. The tube’s test results are displayed in the photos (New 12AX7 Spec 100% = 1,600 Gm). See the photos for physical / cosmetic condition. Part of the design is a little springy shock absorber the keeps the tube safely centered in the box and from rattling around. Notes Regarding Tube Tests. All tubes are tested on an Amplitrex AT-1000 tester in the automatic Fixed Bias Mode (for the most conservative results). Test Results are for a general reference only, and are not a guarantee of performance, nor a guarantee of how they will test on your tester. No real world (audio) performance measurements are taken.

These three tubes came out of a seldom used Norelco tape player, tested 100% both sides, each tube. Seems to me the sub numbers are all the same. Appears number to me to be 165 41k2. Nice lettering, I think great tubes, but not a tube expert like some claim on here. I did not clean. I think nice virgin seldom used tubes, just my opinion. Not sure what more you can ask for in 3 LOT 12AX7 TUBES. Please see all pictures and use zoom feature. Often the pictures describe the item better than words. I try my very best and list a lot of pictures, but are not posted as a “try it and see if it fits and send back ” type item. Please know if this is the item that works for you before you order. Thank You for your understanding on this. 35,000 + happy customers! Also please see the 11,900+ vintage radio related parts and other great antiques and oddities from old radio guys estates. Old Radio’s are Fun and parts are getting harder to find! Just like radio parts? Thank you for you order and please follow my store! New items added daily. Also you can go into my store and pick the category for easy shopping. Best to you and Many Thanks, Mike.

This particular set tests very strong and are closely balanced. The print on these tubes is extremely fragile and will easily rub off, most has already rubbed off on one of them, special care was taken not to rub off any more while testing (the one that still has the most print is the stronger of the 2). The tubes’ test results are displayed in the photos (New 12AX7 Spec 100% = 1,600 Gm). See the photos for physical / cosmetic condition. Notes Regarding Tube Tests. All tubes are tested on an Amplitrex AT-1000 tester in the automatic Fixed Bias Mode (for the most conservative results). Test Results are for a general reference only, and are not a guarantee of performance, nor a guarantee of how they will test on your tester. No real world (audio) performance measurements are taken.

VINTAGE AMPEREX BUGLE BOY 12AX7 AMP TUBE. MADE IN HOLLAND IN 1957. TALL GREY PLATES AND D FOIL GETTER. TEST STRONG FOR EMISSIONS, NO SHORTS OR GRID LEAKAGE.

VINTAGE QUAD GE (VM LABELLED) 12AX7A AMP TUBES. DATE MATCHED MADE IN 1963 IN THE USA TEST STRONG FOR EMISSIONS NO SHORTS OR LEAKAGE.

The product is a vintage Amperex 12AX7A ECC83 amplifier tube. It is a type of vacuum tube used in audio amplifiers to amplify electrical signals. Amperex is a well-known brand in the vintage electronics industry. The model number of the tube is 12AX7A ECC83. It is a popular choice among audiophiles and vintage audio enthusiasts. The tube is compatible with various vintage audio and video equipment and can be used as a replacement part.

The product is a vintage Amperex 12AX7A ECC83 amplifier tube. It is a type of vacuum tube used in audio amplifiers to amplify electrical signals. Amperex is a well-known brand in the vintage electronics industry. The model number of the tube is 12AX7A ECC83. It is a popular choice among audiophiles and vintage audio enthusiasts. The tube is compatible with various vintage audio and video equipment and can be used as a replacement part.

Power amplifier tube vintage stereo integrated used amp el84 12ax7 12au7 gz34 From old Vintage Cinema Hall theater made in Italy years 1950′s Old Vintage tube Amplifier Sound System Two Mono Power amplifier Brand: Fedi manufactured in Milano Italy Model: 25WM Output Power: 18 Watt for each amplifier As per diagram scheme the tubes (not included) are: 2X EL84 ; 1X 12AX7 ; 1X 12AU7 ; 1X EF86 ; 1X GZ34 Knobs: Volume ; Tone A ; Tone B ; Pilot Full metal case and hanging holes on rear, originally installed in audio room into Cinema wall Dimensions: 45 cm X 58 cm X 20 cm Weight 25 kilos each Ultra Rare in pair! This is a great opportunity to get these rare vintage amplifiers!

(I will often reply quickly, unless foraging for mushrooms :).

VINTAGE PAIR MULLARD ECC83 12AX7 AMP TUBE TUBES DATE MATCH LONG-PLATE TEST NOS BLACKBURN TUBES. Test results: 44/46 & 50/46 reference goos is 32 being the min. Tested on tube tester TV7 military calibrated. Also tested in an amplifier and a preamp, for audio sound. Please feel free to ask questions. Please study all pictures.