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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Anyone compare these? posted by Winston Smith on October 29, 2016 at 12:31:11:
I just checked out the ad for those Phillips tube and I am surprised that he would have these listed as "5ar4/5u4g. It is rather loose tube cross referencing. Those tubes will all "work" in the socket that can use any of those tubes but the specs are different. The 5u4 requires 3A current, while the r4 and ar4 only need 2A for the heaters. The u4 and r4 have directly heated cathodes whereas the ar4 is indirectly heated hence the ar4 has a "slow warm up" while the other 2 rectifiers will have a huge voltage surge before the tube starts rectifying and the B+ settles down to normal. I would call it irresponsible for him to cross reference a 5r4 with a 5ar4 since a newbie would not know the difference and might blow up his capacitors if the amp is designed for a 5ar4 and the caps are only rated to 450 or even 500vdc.
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Follow Ups
- RE: Actually 5r4g is not the "same" as 5ar4 - DAK 15:42:24 10/30/16 (4)
- RE: Actually 5r4g is not the "same" as 5ar4 - Eli Duttman 17:14:14 10/30/16 (3)
- RE: The seller is certainly "knowledgable" - DAK 18:26:54 10/30/16 (0)
- RE: Actually 5r4g is not the "same" as 5ar4 - FenderLover 18:13:59 10/30/16 (1)
- Outstanding! Very helpful. Thank you very much! (Nt.) - Winston Smith 19:46:28 10/30/16 (0)
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