Guest " " Posted June 26, 2006 Share Posted June 26, 2006 Anyone know of a tube pre-amp or other device that can be used to bridge two stereo tube amps to operate as two mono blocks. During the late 80's I had an SAE P101 pre-amp that had preamp out puts labeld A+ A- B+ B-. connecting stereo amps to these connections and connecting speakers to just the + terminals of each of the bridged amps accomplished this. Any such options for tube amps? Quote Link to comment Share on other sites More sharing options...
SET12 Posted June 26, 2006 Share Posted June 26, 2006 Not that I know of unless you use a balance out then converted to single-ended and remember that it will take to 4 ohm taps to in series to make an 8 ohm connection Frank VanAlstine had a inverter for such use he may still sell it. SET12 Quote Link to comment Share on other sites More sharing options...
Edgar Posted June 26, 2006 Share Posted June 26, 2006 See section 11.20 of http://www.gatago.com/news/answers/16950855.html Also http://www.avahifi.com/root/equipment/bridge/index.htm Also search for "bridge" at http://www.nleindex.com/index.php?pID=HTDI&sID=BrowseIndex&tID=E/891 Great American Sound made a transformer-coupled bridge in the late 70s, but I've never actually seen one. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted June 27, 2006 Share Posted June 27, 2006 thanks, will followup later today. Quote Link to comment Share on other sites More sharing options...
Rocketman4274 Posted June 28, 2006 Share Posted June 28, 2006 My BAT preamp has two main outputs to run two amps.I know Mcintosh offers preamps that you can drive two amps.I am sure these are not the only ones.My BAT is a fully balanced,front to back,tube pre.Unless this is not what you are talking about. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted June 28, 2006 Share Posted June 28, 2006 My BAT preamp has two main outputs to run two amps.I know Mcintosh offers preamps that you can drive two amps.I am sure these are not the only ones.My BAT is a fully balanced,front to back,tube pre.Unless this is not what you are talking about. if the two outputs offer placing the second out of phase, then yes. the ss pre-amp I had that did this had normal "in-phase" out puts for left and right, and a second set of "out-of-phase" outputs for left and right. You would need any 2 stereo amps to use the bridging feature. All you need to do is hook up each amp to a "in-phase" as well as an "out-of-phase" set of outputs, connect a set of speakers across just the positive terminals of each amp (nothing connected to the negative terminals at all), and the result was a pair of bridged amps. I was wondering if any tube pre-amps have this feature. Quote Link to comment Share on other sites More sharing options...
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