Anyone built or heard an Alley Oop amp?

Posted by vinnie2 (A) on September 18, 2016 at 07:43:54

At least that's my nick name for it. I have started going through my collection of SP magazines again like I do ever few years. Last night I was looking at issue Vol. 2, #1 and saw J.C. Morrison's article on his design for the dinosaur amp. I noticed that he advocates running the chinese 845 tubes "low and hot". Low voltage and high current. For the dinosaur he suggests operating points of 500 vdc plate volts, 88 mA plate current and -50 vdc grid volts. I am thinking I just might give that a try on the 26/26/845 I have on the bread board as the power tranny I am using can get there and I think I have caps rated high enough. Wondering if anyone has run a 845 at these operating points before? JC claims this is a good way to get great sound from the 845. It sure puts you in a linear region of the plate curves from what I can see.
Setting it up on SE amp cad it appears to be well below the max dissipation curve for the 845.
I would be interested in hearing of anyone's experiences along these lines.

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Topic - Anyone built or heard an Alley Oop amp? - vinnie2 07:43:54 09/18/16 (19)

At 500Vdc the output of the 845's should be..... - Cougar 21:10:20 09/20/16 (6)

RE: At 500Vdc the output of the 845's should be..... - vinnie2 03:11:20 09/21/16 (5)

I still have all my parts... - Cougar 07:37:37 09/21/16 (4)

They do indeed sound heavenly (nt) - Naz 05:19:24 09/22/16 (3)

I'm ready to go start that 845 amp build now - Cougar 15:16:16 09/22/16 (2)

RE: I'm ready to go start that 845 amp build now - Naz 16:15:07 09/22/16 (1)

I just need to get the high voltage wire.... - Cougar 23:44:30 09/22/16 (0)

RE: Anyone built or heard an Alley Oop amp? - Ivan303 14:05:09 09/18/16 (1)

RE: Anyone built or heard an Alley Oop amp? - vinnie2 15:33:33 09/18/16 (0)

RE: hmmmmm - vinnie2 13:48:07 09/18/16 (9)

RE: hmmmmm - drummerwill 21:11:52 09/18/16 (8)

RE: hmmmmm - vinnie2 04:49:54 09/19/16 (6)

RE: hmmmmm ...here's a thought .. - drummerwill 12:29:25 09/19/16 (5)

RE: hmmmmm ...here's a thought .. - vinnie2 15:06:16 09/19/16 (4)

RE: hmmmmm ...here's a thought .. Well vinnie.. - drummerwill 15:44:56 09/19/16 (3)

RE: hmmmmm ...here's a thought .. Well vinnie.. - vinnie2 17:09:26 09/19/16 (2)

RE: hmmmmm ...here's a thought .. Well vinnie.. - drummerwill 19:02:29 09/19/16 (1)

RE: hmmmmm ...here's a thought .. Well vinnie.. - vinnie2 04:48:53 09/20/16 (0)

RE: hmmmmm .... Oh yeah .... - drummerwill 21:15:01 09/18/16 (0)

Anyone built or heard an Alley Oop amp?

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