RE: PX-25 or PX-4

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Questions about tubes and gear that glows. FAQ

In Reply to: RE: PX-25 or PX-4 posted by setamp on January 19, 2015 at 12:13:02:

In that case happy hunting although I would question the use of PX25 . This type has higher Ra than 300B/PX4/2A3 and requires not only a rebias but a higher impedence output transformer . I have one low mu PX25 called the AC/PX25 , which bias up similarly to 300B but these are extremely rare . There are others such as DO26 but again very rare . I don't know if modern PX25 are based on the originals with mu of 10 or upon 300B with mu of 4 . Osram PX4 are very nice . I have several sets of these which I'm keeping for a rainy day . KR PX4 are supposed to have a slight edge on the originals , although I have never tried these

Al

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Follow Ups Full Thread

Topic - PX-25 or PX-4 - setamp 08:05:41 01/19/15 (4)

RE: PX-25 or PX-4 - Al Noakes 10:41:54 01/19/15 (2)

RE: PX-25 or PX-4 - setamp 12:13:02 01/19/15 (1)

RE: PX-25 or PX-4 - Al Noakes 12:27:50 01/19/15 (0)

RE: PX-25 or PX-4 - andy evans 08:57:36 01/19/15 (0)

Follow Ups

RE: PX-25 or PX-4 - Al Noakes 12:27:50 01/19/15 (0)

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