Philips Audio Tubes
(Valvo Amperex Mullard)
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The GZ34 Gallery 5AR4 |
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Many rectifier tubes have been made by the Philips company. All I know are of outstanding quality. Many tubes from which I knew that they worked for many years still test as new tubes. All tubes have the following common charecteristics (except where otherwise noted):
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6 square holes in each plate - 5 pin connector on octal socket |
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| Tubes from Dutch and Belgium Production | |||||
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Code: rsB 54 Identified by: - No hole in guiding pin - one closed getter - no plate holes - Straight plate sides Comment: One of the first GZ34 tubes made. |
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Code: f31 X8X Identified by: - Two D Getters - code from below - not on glass - Straight plate sides Comment: 1958 type made in Brussels. |
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Code: rs1 55A Identified by: - No hole in guiding pin - Two D Getters - no plate holes - Straight plate sides Comment: Very early version. |
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Code: f33 L0J Identified by: - Two D Getters - no plate holes - brown base Comment: Made in 1959. Rarer than metal base. Click here!!! |
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Code: tv1 56H Identified by: - Two D Getters - Straight plate sides Comment: Last version of the metal base GZ34 until 1957 (as tv2 coded). |
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Code: f32 X9G Identified by: - Two D Getters - flatter top - Straight plate sides Comment: Another 1959 type made in Brussels. |
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Code: f33 L2H3 Identified by: - Two D Getters - Straight plate sides Comment: Early 60s type made in Brussels. |
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| Tubes from British (Mullard) Production
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Code: f32 B5B3 Identified by: - Two ring getters - only 8cm heigh - 4-ribbed plate side Comment: Later mid 60s type made in Blackburn, U.K. |
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Code: f32 B6I1 Identified by: - Two ring getters - 4-ribbed plate side Comment: Quite similar to the left tube, but slightly larger. |
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Code: f32 B3J1 Identified by: - single ring getters - 7-ribbed plate side - red shining plate borders Comment: Early 60s version - found in many stereo HiFi tube amps. |
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Code: f32 B7F4 Identified by: - single ring getters - 4-ribbed plate side - red shining plate borders Comment: Late 60s type from England. Found in many later Leak stereo amps. |
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GZ33 Code: rS1 B4C5 Identified by: - base ring getter Comment: Just to compare. |
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