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Re: Preamp suggestions [message #74181 is a reply to message #74179] Fri, 19 October 2012 22:37 Go to previous message
Shane is currently offline  Shane
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Registered: May 2009
Illuminati (3rd Degree)
SteveBrown wrote on Fri, 19 October 2012 22:17
How about a scratch build? Or must it be a kit? My current favorite is my triode wired 12V6 preamp. Easy to build and sounds great! I use a conventional 6.3v winding and voltage doubler to get 12v for the 12V6's. That means that you can find excellent NOS varieties for next to nothing.


Thanks Steve. The Moebius would be a scratch p2p build. It's a simple circuit and if you build the chassis like Eric it looks very nice as well. The only thing that maybe might put me off is the fact that it inverts phase due to the circuit. No big deal really as songs on the same Cd or vinyl can have different phases.

I've got most of the parts to build Richard Gray's preamp he had a LSAF the last time he attended. It's a single 12AU7 modified off of a Bottlehead foreplay circuit with a chip from one of the old Cd players in it I think. Looked like junk, but sounded very, very good. Everyone talks down on the 12AU7, but there sure were a lot of people listening to that pre commenting on how good the sound was and didn't even realize it was goingin through that unit. It's only downside is you have to have a mute switch when turning on when hooked to a SS amp or it will fry the transistors.
http://www.rollinghillsimagery.com/Electronics/LSAF-2008/i-JLgR7rv/0/L/DSC1370-L.jpg

I'm most likely going to build one of Wayne's passive RDAC units and give it a try first before I decide if I need something active for sure. I'll keep the 12V6's in mind and would love to see a schematic and pics of yours if possible.
 
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