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2 Questions on tube replacement

I am using an Icon Audio PS-1 MKii phono stage.

My record suddenly stopped making any sound at all. I noticed that one of the three output tubes was not firing, so I am going to try replacing it.

The phono stage takes 3 ECC83/12AX7 tubes.

My two questions are:

1 — Can I substitute ECC803 for the ECC83s?; and

2 — Do I need to switch out all three or only replace all one at a time?

Thanks in advance.

saulh

Showing 1 response by yogiboy

yogiboy's avatar
yogiboy
5,792 posts
 

1-yes

2-no

All these tubes can be substituted for a 12ax7!!

Direct Replacements

  1. ECC83: This European equivalent of the 12AX7 is virtually identical in terms of electrical characteristics, mechanical dimensions, and heater requirements. It provides a seamless transition and is often used interchangeably in audio equipment.
  2. 7025: This is a high-quality, low-noise version of the 12AX7 that offers improved performance in terms of reduced microphonics and hum. This tube is an excellent choice for audio equipment that requires low-noise operation.
  3. 5751: Another directly replaceable tube with slightly lower gain than the 12AX7 (approximately 70% of the 12AX7’s gain). This tube provides a slightly different tonal characteristic, making it suitable for those seeking a cleaner, more transparent sound.
  4. ECC803S: This is a premium, long-plate version of the ECC83, known for its exceptional sonic qualities and high reliability. This tube offers improved microphonics and stability, making it an excellent choice for demanding audio applications.
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