NOS and Used
Vacuum Tube Products and Price List.
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TUBE SUBSTITUTION LIST
4A6 - 4S

* These are parallel filament circuits.
# In series circuits, this tube doesn't need any form of regulated warm up time.

TO REPLACE	USE
4-125A	6155, 4D21
4A6	4A6G
4A6G	4A6
4AU6	4BA6, 4BC5 { This might not work in some circuits. } 4BZ6 { This might not work in some circuits. } 4CB6 { This might not work in some circuits. } 4CE5 { This might not work in some circuits. } 4CF6 { This might not work in some circuits. } 4DE6 { This might not work in some circuits. }
4AV6
4B31	RK4B31, CV3510
4BA6	4AU6, 4BZ6 { This might not work in some circuits. }
4BC5	4AU6 { This might not work in some circuits. } 4CB6 { This might not work in some circuits. } 4CE6 4CF6 { This might not work in some circuits. } 4DE6 { This might not work in some circuits. } 4DK6 { This might not work in some circuits. }
4BC8	4BQ7A, 4BS8, 4BX8, 4BZ7, 4BZ8, 5BK7A
4BE6	4CS6
4BL8	5CQ8 { This might not work in some circuits. } 5EA8, 5U4
4BN4
4BN6
4BQ7A	4BC8, 4BS8, 4BX8, 4BZ7, 4BZ8, 5BK7A
4BS8	4BC8, 4BQ7A, 4BX8, 4BZ7, 4BZ8, 5BK7A
4BU8	4GS8, 4HS8, 4KE8, 4MK8
4BX8	4BC8, 4BS8, 4BQ7A, 4BZ7, 4BZ8, 5BK7A
4BZ6	4AU6 { This might not work in some circuits. } 4BA6 { This might not work in some circuits. } 4CB6 { This might not work in some circuits. } 4CF6 { This might not work in some circuits. } 4DE6 { This might not work in some circuits. } 4DK6 { This might not work in some circuits. } 4JH6
4BZ7	4BQ7A, 4BS8, 4BX8, 4BC8, 4BZ8, 5BK7A
4BZ8	4BQ7A, 4BS8, 4BX8, 4BZ7, 4BC8, 5BK7A
4CB6	4AU6 { This might not work in some circuits. } 4BC5 { This might not work in some circuits. } 4BZ6 { This might not work in some circuits. } 4CE5 { This might not work in some circuits. } 4CF6, 4DE6, 4DK6
4CE5	4AU6 { This might not work in some circuits. } 4BC5 4BZ6 { This might not work in some circuits. } 4CB6 { This might not work in some circuits. } 4CF6 { This might not work in some circuits. } 4DE6 { This might not work in some circuits. } 4DK6 { This might not work in some circuits. }
4CF6	4AU6 { This might not work in some circuits. } 4BC5 { This might not work in some circuits. } 4BZ6 { This might not work in some circuits. } 4CB6 4CE5 { This might not work in some circuits. } 4DK6
4CM4
4CS6	4BE6
4CX7
4CX250B	7203, 8621, CV6137, FU-251F, RE025XA
4CX250F	7203, 8621, CV6137, FU-250F, RE025XA
4CX250F/G	7203, 8621, CV6137, FU-250F, RE025XA
4CX250G	7203, 8621, CV6137, FU-250F, RE025XA
4CX250K	8245
4CX800	GU-74B
4CX800A	GU-74B
4CY5
4D21	4-125A, 6155
4DE6	4AU6 { This might not work in some circuits. } 4BC5 { This might not work in some circuits. } 4BZ6 { This might not work in some circuits. } 4CB6 4CE5 { This might not work in some circuits. } 4DK6
4DK6	4BC5 { This might not work in some circuits. } 4BZ6 { This might not work in some circuits. } 4CB6 4CE5 { This might not work in some circuits. } 4CF6, 4DE6
4DT6	4DT6A
4DT6A	4DT6
4EH7	4EJ7 4HM6 { This might not work in some circuits. } 4HT6 { This might not work in some circuits. } 4JC6 { This might not work in some circuits. } 4JC6A { This might not work in some circuits. } 4JD6 { This might not work in some circuits. }
4EJ7	4EH7 4HM6 { This might not work in some circuits. } 4HT6 { This might not work in some circuits. } 4JC6 { This might not work in some circuits. } 4JC6A { This might not work in some circuits. } 4JD6 { This might not work in some circuits. }
4ES8	4KN8
4EW6	4GM6
4FS7	4HG8
4GJ7	4GX7
4GK5
4GM6	4EW6
4GS7	4LJ8
4GS8	4BU8, 4HS8, 4KF8, 4MK8
4GW5
4GX7	RGJ7
4GZ5
4HA5	4HK5#, 4HM5, 4HQ5
4HA7
4HC7
4HG8
4HK5	4HA5, 4HM5, 4HQ5
4HM5	4HA5, 4HK5#, 4HQ5
4HM6	4HT6, 4JC6, 4JC6A, 4JD6
4HQ5	4HA5, 4HM5, 4HK5#
4HR8
4HS8	4BU8, 4GS8, 4KF8, 4MK8
4HT6	4HM6, 4JC6, 4JC6A, 4JD6
4JC6	4HM6, 4HT6, 4JC6A, 4JD6
4JC6A	4HM6, 4JC6, 4HT6, 4JD6
4JD6	4HM6, 4JC6, 4JC6A, 4HT6
4JH6	4BZ6
4JK6	4EW6, 4JL6
4JL6	4EW6, 4JK6
4KE8
4KF8	4BU8, 4GS8, 4HS8, 4MK8
4KN8
4KT6
4LJ8	4GS7*
4LU6
4MK8	4BU8, 4GS8, 4HS8, 4KF8
4S	2S / 4S

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