Audionerd Posted October 24, 2018 Share Posted October 24, 2018 (edited) Item: Musical Surroundings Fosgate Signature MM/MC All Tube Phono Amp Location: Melbourne Price: $2850 Item Condition: Like new with original carton & manual Reason for selling: Sacrificing analogue for digital funds Payment Method: Cash, Bank Transfer or Paypal Extra Info: This legendary Top of the Range phono stage has now become a collector's item, the best that US phono specialist Musical Surroundings can offer. Truly a superbly musical and ultra-quiet performer with both MM and MC cartridges, with easily adjustable impedance settings for various cartridges. It was purchased directly from the importer and retailed for about $4500. I would not be parting with this beautifully made piece of analogue history if money didn't matter. Original packaging means that postage is not a problem. Pictures: Edited October 24, 2018 by Audionerd Link to comment Share on other sites More sharing options...
BugleBoy Posted October 24, 2018 Share Posted October 24, 2018 Does this have a built-in SUT? Link to comment Share on other sites More sharing options...
Gryffles Posted October 25, 2018 Share Posted October 25, 2018 12 hours ago, BugleBoy said: Does this have a built-in SUT? No, it's all tube. Excellent phono stage Link to comment Share on other sites More sharing options...
Audionerd Posted October 25, 2018 Author Share Posted October 25, 2018 Sorry about the delayed response. Hopefully a more detailed description below makes sense. This model is the culmination of over 100 different circuits built by legendary designer Jim Fosgate since the 1970s, and more sophisticated than MC transformer based designs. It's all tube in push-pull configuration for the best possible linearity, while minimising noise and distortion. There are no solid state devices or transformers in the signal path, with a tube also being used for the high voltage rectifier. There are also no regulated power supplies. The unusual power supply contributes to its high performance, each tube stage powered by a separate oversize storage capacitor that acts like a battery. The power supply simply holds the voltage across the capacitors like a "trickle charger". PCB layout is dual mono, each channel located on opposite sides in near mirror image with a row of dual triodes down the centre. Importantly, the first stage has no negative feedback to interact with the cartridge. Second and third stages are enclosed in a single feedback loop using both positive and negative feedback. The RIAA network is divided into 2 sections, one passive and one active. The upper half (above 1 Khz) is accomplished with a passive network between stage 1 and 2, the lower half with an active network around stage 2 and 3. Link to comment Share on other sites More sharing options...
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