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In Reply to: RE: Anyone built or heard an Alley Oop amp? posted by vinnie2 on September 18, 2016 at 07:43:54
Well I went ahead and dialed it in, and I can't say I really heard that much difference from the version using plt 430, grid 51 and current 62 mA. There was a bit more gain of course, and I think the bass might have been a tad cleaner, but nothing really earth shaking. Soooooo, that leaves me with the question if I can change the operating points by that much and not really hear much difference, how critical are they?
Follow Ups:
Yo Vinnie Here's my 3 stage Low voltage stereo 845 amp. It's 6sn7 Directly coupled to a 2A3 and IT coupled to the 845. It run at 600VDC on the 845's at about 72ma. I didn't want to use a higher B+ than 600VDC.
It sounds very nice, like a Big 45. I have to use a preamp to get it to play at loud volumes. But fun!
I prefer my 26-26 DC 45 amp !!! JMHO !
Willie
Hey Willie
Nice looking amp. I wanted to stay with all dht as I have been captivated by their sound. I have been A/B ing my 26/26/45 against the 26/26/845 with a mono source by hooking one channel of each to my preamp and switching back and forth between them with the volume controls. To me they are quite close, but I like the overall sound of the 845 just a little bit better I think. I could be happy with either though.
....maybe if your 26/26/45 amp were a better build, you might like it more !
I'm just saying!
Have fun
Willie
I'm curious Willie, what makes you think it isn't?
Edits: 09/19/16
its all about the build. Ver.#1 got me hooked.
Ver.#2 is at this stage is the "Bomb" dynamics galore ,pace, and purity of tone ... Yes, Yes, Yes...
It's all about the build I'd like to think this is a better build than the Ver. #1 ...... It shows up in the sound
Have fun
Willie
I think this is a pretty good build don't you?
...Yeah looks nice ......But it doesn.t look like it's built for "Speed " !
Willie
You are going to have to do better than that Willie.... details if you don't mind.
You might want to contact Jeff, he had a 2 stage Low power 845 design.
Willie
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