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Testing and Matching Procedures
12AT7/ECC81/CV4024
12AU7/ECC82/CV4003/5963/5814/6189
12AX7/12AX7A/ECC83/7025/CV4004
12AY7/6072
5751
5879
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5V4G/A/GZ32
5Y3G/GT/6106
6550/KT88
6973
6AQ5
6BQ5/EL84/7189A
6CA7/EL34
6DJ8/ECC88/7308/CV2493/6922/E88CC
6L6/7581/5881/KT66/EL37/5932
6U8A
6V6/G/GT/GTA/5992
7027/A
7189/A
7199
7581
7591A
7868
8417
EF86/6267/EF806
EL34
EL37
EL84
EZ80/6V4
KT66
New Production Tubes
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12BH7
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12DW7/7247
2A3/5930
5687
6C10
6C4
6CA4/EZ81
6CG7/6FQ7
6EU7
6K11
6K6GT
6SC7/GT
6SJ7
6SL7/5691/6SU7
6SN7/5692/VT231
6SQ7/GT
6U10
6X4
801/801A/VT62
6BM8
6AN8A
6350
6X5GT
6D10
7119
7355
6J5
6AT6
6AU6

NOS Tung Sol 6550 Matched Pair

NOS Tung Sol (labeled and boxed as RCA) 6550s

ST "coke bottle" shape in good original RCA boxes .
In-stock

$475.00