Question About Audio Research Preamp Specs
audioconnection That’s more truth than fiction, we have a very good power amp maker here that has 1kohm input, and yes his preamp is 10ohms, so any other preamp sounds like **** into it but his doesn’t. But the 1k input resistor on the amp is socketed and if removed the input becomes 68kohms, but he doesn’t advertise this, and any preamp/tube ss/or passive will drive it then. Cheers George |
1: If you own the AR pre, tell me the size (uF) of the output coupling cap, (it will be the big ones near each output) and what the poweramp input impedance is you want to use it with, and i’ll calculate at what low frequency it’s at -3db for you.The reason ARC didn't do this initially was simply because the larger you make a coupling cap the more coloration no matter what type of construction. Larger caps start to get considerably higher inductance so even if you have the best Teflon its still going to be an audible degradation. A secondary reason might also have to do with space. Adding long leads to make a part fit in a place that wasn't designed for it is a good recipe for noise pickup. |
The reason ARC didn't do this initially was simply because the larger you make a coupling cap the more coloration no matter what type of construction.Take that with a grain of salt. I do prefer direct coupling (no cap), best cap is no cap mentality. But dsper OP one of the best tube preamps hailed even by many tube and solid state preamp manufactures as being the best tube preamp ever made is the Aesthetix Calypso preamp, and it has massive output coupling caps, as shown in this pic circled in red. https://ibb.co/4Jb0bSV Cheers George |
