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| The JAN-Cetron 5R4WGB tube is a industrial version of the 5R4 tube. |
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| Replaces 5R4GYB or 5R4GY tube types. Assorted brands in stock. Availability: Usually ships within 24 hours. |
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| Replaces 5V4 tube types. Assorted brands in stock. |
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| This 6Z4 is a Chinese rectifier type. Note: This is not equivalent to the American 6Z4/84 tube. |
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| The Mullard GZ37 / CV378 tube is a indirectly heated full-wave vacuum rectifier. Although it is not a direct sub to the GZ34/5AR4 tube or 5U4G tube, it can be used in many of these circuits. Audiophiles have known for years of the GZ37/CV378 tube and it's wonderful sound quality. Owners of hi-end amplifiers such as Jota, Diavolo, and PX25 by Art Audio use these in the unique dual-mono power supplies. |
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| 5931The 5931 tube is a very robust 5U4-GB tube variant. It has a large diameter base and is considerably taller than a standard 5U4GB tube. Because of it's wider base diameter, the 5931 tube may not fit into all 5U4 tube applications. |
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