• -15%
12AT7 - ECC81 SYLVANIA GTE INTL USA - 3% SPECIAL SELECT - Single (v226)

12AT7 - ECC81 SYLVANIA GTE INTL USA - 3% SPECIAL SELECT - Single (v226)

€34.00 Save 15%
€40.00
VAT included
Last items in stock
Sylvania USA
12AT7_Sylvania_v226

ULTRA-MATCHED SINGLE 12AT7 - ECC81  SYLVANIA GTE INTL 1979 NOS-NIB USA, SPECIAL SELECTION By Audiokit BALANCED TRIODES for Ip & Gm within  3% on 4 measurements, code 76 E49, Smooth Grey Plates, Top O Ring Getter, in Original Box (v226)

Quantity

THE BEST ! THE MOST PRECISE! with very tight tolerances, they are chosen by us during the normal selection for the coupling, to consider that out a pair so at least every 20-30 tubes measured, considering that for each tube (double triode) there are four measurements toagree (Ip e Gm for each triode)

To achieve this we use our TTA (the warmer) which allows us to heat up to 20 tubes at the same time and then perform the measurements with the "Characteristic Meter Avo VCM 163" so the heating time will be the same for the whole lot so as to obtain precise and reliable relative numbers for the subsequent selection made with a software developed by us that compares all the values ​​of Ip and Gm of the whole and extrapolates the single balanced triodes, the pairs, the triplets, the quartets to the various tolerances.

For traceability the Tubes are individually numbered on bulb/Base and inside the box, other numbers that you read inside the box are NOT the values but are our references for recording the measurements on our archive.

For information we specify that the measurements are performed at constant Va, therefore having Ip and Gm within close tolerances, also the Ra and the μ will be.

Sylvania USA
12AT7_Sylvania_v226

Data sheet

note
Burned, Tested, Selected by Audiokit with TTA+ AVO VCM 163 + AKi Matching Software
dati
ins 31/1/2022 MZ

New Account Register

Already have an account?
Log in instead Or Reset password