Re: 5687 substitute recommendations

Posted by Seán on June 13, 2005 at 10:34:26

In Reply to: 5687 substitute recommendations posted by Srajan Ebaen (R) on June 12, 2005 at 15:21:12:

I use the 5687 in a Border Patrol SE300B, where it drives the 300B by means of an interstage transformer. In this application, the 7044 and the E182CC may be substituted. Some diyers on this asylum, I recall, have expressed a preference for using the 5687 at a higher plate voltage, something in the order of 250v; I am not at all sure such plate voltages would be apposite to the substitutes, particularly, the E182CC, but, perhaps, someone is qualified to pronounce on this. Anyway, I would be surprised if the ModWright operated at such, higher voltages. I have always found the 5687 preferable in the Border Patrol, though, on a number of occasions, I have heard from others, Gary Dews (the designer of the Border Patrol) among them, their preference for the E182CC, speaking of greater drive, higher resolution. I have not been able to confirm such reports: for some, possibly, the qualities alluded to result from the higher gain of the substitutes, the Mu of the 7044 being 21 and that of the E182CC being 24 against the 18 of the 5687. I note, also, that in the new Border Patrol Control Unit, Gary has utilized the 5687; this does not contradict his earlier expressed preference for the use of the E182CC in the three-stage SE300B, for the application is quite different.

I have acquired, '54 Tung Sol, l50s Raytheon, cryogenically treated 60s Tung Sol (from ATSI), l50s/e60s bronze plate Tung Sol, inter alia, but current favorite for its compromise of qualities - came upon without recommendation, indeed, stumbled upon â€” is the GE5687 5 star, production sometime after '62 when the plates were perforated with two holes on each triode â€” I believe there is a clearly discernible, but subtle difference between this type and other GE5687 5 star.

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Follow Ups Full Thread

Topic - 5687 substitute recommendations - Srajan Ebaen (R) 15:21:12 06/12/05 (16)

Re: 5687 substitute recommendations - Peter Qvortrup 06:58:44 06/14/05 (1)

Re: 5687 substitute recommendations - JG2 09:12:32 06/14/05 (0)

Re: 5687 substitute recommendations - mattybumpkin 14:47:14 06/13/05 (0)

Re: 5687 substitute recommendations - Seán 10:34:26 06/13/05 (0)

Re: 5687 substitute recommendations - Shakey 21:15:29 06/12/05 (0)

Re: 5687 substitute recommendations - Eli Duttman 21:13:32 06/12/05 (0)

Try Head-Fi and the recomendations for use in the Raptor? - braillediver 19:35:01 06/12/05 (0)

Re: 5687 substitute recommendations - jcoe 18:30:14 06/12/05 (2)

Re: 5687 substitute recommendations - jcoe 18:33:59 06/12/05 (1)

Re: 5687 substitute recommendations - Peter Qvortrup 07:09:41 06/14/05 (0)

Re: 5687 substitute recommendations - Homer Jay 15:34:14 06/12/05 (5)

Re: 5687 substitute recommendations - Peter Qvortrup 07:00:31 06/14/05 (0)

Re: 5687 substitute recommendations - Srajan Ebaen (R) 16:53:12 06/12/05 (3)

Re: 5687 substitute recommendations - GuyL 21:05:31 06/12/05 (2)

Second the 7119 - Joe Appierto 12:16:59 06/13/05 (1)

Thanks guys, for all your suggestions - Srajan Ebaen (R) 14:06:51 06/13/05 (0)

Follow Ups

Re: 5687 substitute recommendations - Seán 10:34:26 06/13/05 (0)

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