(!!!!) (Best Overall Single) JAN-5998=421A Tungsol black plates top and side getter NOS 1966 (124ma and 119ma) (Close Gm)
By Tube World
JAN-5998 Tungsol black plates top and side getter NOS 1966 original box
1 section) 124ma Gm=17,500
1 section) 119ma Gm=17,200
SINGLE TUBE, NOT A PAIR
Good Ma range 70-100ma
Good Gm range 14,000 - 16,000
BEST FOR:
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Peter Millett headphone amp
Woo Audio 2
Woo Audio 3
Woo Audio WA3+
Darkvoice 336i
Darkvoice 336SE
Fi 421A
Singepower Extreme
(5998 is an uprated 6AS7G and has a 13 watt plate dissipation rating)
(the 5998 sounds very clear and has superb overall sonics, the 421A Western Electric sounds even better; slightly more magical sound)
(5998 Mu = 5.4, Gm = 15500, Rplate = 350 ohms, Vplate max = 250 volts and Vplate max 5998A = 275V)
(7236 Mu = 4.8, Gm = 12500, Rplate = 350 ohms, Vplate max = 300 volts)
(7236 is a computer rated 5998A, 7236 and 5998A are uprated from 5998)
(6AS7G Mu = 2, Gm = 7000, Rplate = 280 ohms)
(6080 Mu = 2, Gm = 6500-7000, Rplate = 280-300 ohms)
5998 substitute = 7236
7236 is a computer rated 5998A
5998 RATINGS:
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Filament Voltage 6.3 V
Filament Current 2.4 A
Plate Voltage (max) 250 V
Plate Current (max) 125 mA
Plate Dissipation (max) per section 13 W
 (Best Overall Single) JAN-5998=421A Tungsol black plates top and side getter NOS 1966 (124ma and 119ma) (Close Gm)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_56bc35e3-a07d-4a0d-bf16-4a4801c93508.jpg?v=1709658361){kind=link}
 (Best Overall Single) JAN-5998=421A Tungsol black plates top and side getter NOS 1966 (124ma and 119ma) (Close Gm) "Pin It")