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In Reply to: Re: Nice job, show us some pics under the hood posted by deafbykhorns on October 26, 2016 at 18:47:06
I have taken any of the new amp yet. The new amp has only been running for a few hours. I don't want to jinx it. cheers.
Follow Ups:
Hi DAK,
Looks very well built and well laid out. Kudos.. I like the corner brackets too.. Did you use K&K audio pcb's for the LL1544A? I have a pair myself in an old DAC with diy pcb's a friend made for me years ago. I want to re-use them in another app like yours one of these days but for SE as step ups.. Do they still have good bass response with a highish line level signal from a preamp? Thank you.
Regards....
hi Fred, and thank you for the kind words. The chassis is made from aluminum, probably home made, that i acquired with some Dynaco a450 outputs. The builder gave up on the project. I need to use the brackets to reinforce the rigidity which was poor since the sides of the amp were just bent and not welded. The corner braces made the chassis 10x stronger.
The input trans and the circuit board are from K&K and to me they perform invisibly. The only thing is the gain is halved which because of the preamp is not an issue. Although, this particular trans can be configured for more gain 2 or 3 times, but Kev suggested that since i am using a preamp for the best sound quality use it as straight split.
Since i based the amp on a SE circuit that i like to use, with each SE amp driving 1/2 of the split phase, i wanted to know what effect the cancelled 2nd order harmonics would have. I also wanted to know what is the "sound" of the phase splitter. I always felt that the tube phase splitter introduces some coloration since there is no perfect phase splitter. To me the sound from this amp is more coherent and very much like SE but "cleaner" with more subtleties coming through. cheers, Dak
Hi DAK,
Thanks for the detailed response, and sharing your thoughts on the Lundahl trafo as input phase splitter.. What type of preamp do you use with it?
Best regards...
It is an Audio Electronics AE3 made by Cary. It is a simple linestage preamp with SS rectification and 2 6sn7 for the tubes. Nice and neutral preamp.
Thanks DAK..
I remember Cary/AES 6SN7 preamps.. Iirc, one variation uses a 6CA4 series psu reg w/ ss rectifiers.
Regards..
Right. In fact the chassis has a hole for that but mine doesnt so it is covered.
I rebuilt an AE3 with a blown power trans, in which i used a potted transformer and i used a 6x5 rectifier tube. I think it sounded a little smoother than the SS rectified version.
Very nice, clean and neat! Love those AB pots, darn they're expensive now!
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Buy Chinese. Bury freedom.
I have a box full of the AB's, but they are all high value (5k+). Any way to use them?
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