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EICO 635 Tube Tester





Select or type a tube name to get specific settings for the Eico 635 Tube Tester.

Sort columns values by clicking their titles - A → Z or Z → A

ID Tube 1 2 3 4 Socket Short Test
251 4BC5 A 7 D 1 L 2-6
252 4BC8 A 3 D 2 A -
253 4BC8 A 8 D 7 A -
254 4BE6 A 2 D 1 L 2-6
255 4BK7 A 3 D 2 A -
256 4BK7 A 8 D 7 A -
257 4BL8 A 7 D 2 A 2-3
258 4BL8 A 8 D 9 A -
259 4BN4 A 1 D 2 L -
260 4BN6 B(S) 1 D 5 L 2-6
261 4BQ7 A 3 D 2 A -
262 4BQ7 A 8 D 7 A -
263 4BS8 A 3 D 2 A -
264 4BS8 A 8 D 7 A -
265 4BU8 A 1 D 7 A 2-2
266 4BX8 A 3 D 2 A -
267 4BX8 A 8 D 7 A -
268 4BY6 A 2 D 1 L 2-6
269 4BZ6 A 2 D 1 L 2-6
270 4BZ7 A 3 D 2 A -
271 4BZ7 A 8 D 7 A -
272 4BZ8 A 3 D 2 A -
273 4BZ8 A 8 D 7 A -
274 4CB6 A 2 D 1 L -
275 4CE5 A 2 D 1 L 2-6
Important
Note A: Set all switches before inserting the tube in its socket.
Note B: First test for shorts before making quality test.
Note C: If "shorts-grid leakage" indicator glows when tube is inserted in its proper socket do not test for quality. Damage to the circuit of the tube tester may occur or you may damage the tube.
Note D: Tubes listed with a "#" next to it is read on diodes OK scale.

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Last modified: Jun 5, 2026 20:40
Cape Old Radio - Since Nov, 1996
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