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I'm not sure if these have entered production yet or not but here's the new 900W monoblocks from Bob Carver.[/quoteHi Steve and all Audio Circle members.Have a look at Bob Carver's website. (Link below)http://bobcarver.com/default.asp]Guy 13
I'd rather use a tube socket. Interesting fact: The GI-7B is used in grounded-grid configuration 99% of the time. The 'fingers' which hold the tube in rest on the grid contact (a circle of metal) and go directly to ground through the chassis. Grounded grid configurations like this are always cathode biased. For audio: The socket could be insulated from the chassis then it could be grid biased and modulated. I would most likely use 572B's for my first attempt at a push-pull high power amp.
I'm not sure if these have entered production yet or not but here's the new 900W monoblocks from Bob Carver.
Building humongous tube amps seems crazy, at least to me. There just isn't any real life application for them. If you own a speaker that requires really large amounts of power, something is really flawed in its design. Use smaller amps in multiple with dedicated crossovers. Solid state amps, either dual differential AB or perhaps ICE D units, can be used on woofers, saving tubes for the mid and high frequencies. I guess I don't appreciate being so wasteful of expensive tubes.The new Carver is basically a design exercise. Bob is a brilliant guy, with a bit of PT Barnum showmanship thrown in. I would like to know what the heck his 'restorer' circuit is though. Steve
Cathode biased is bad?? or something unsual?The Russian QRO site suggest use the GI-7B without socket, the socket creates interferences, a bare wire connection can be seen in the ham radio video:http://qro-parts.com/product_info.php?products_id=94These are coaxial microwave tubes are capable to generate on VHF. Any spurious capacitances, inductances and resistances imported Socket can cause it. Russian electronic industry interposed these tubes directly into devices. And it was the best solution!The english text above is some clumsy, but I undestand the socket is not recommended.
I guess tube rolling won't be happening much with those amps, with 40 output tubes to replace in a stereo pair. Wonder what THAT costs. As they say, since I have to ask, you know I can't afford it
Quote from: FULLRANGEMAN on 5 Sep 2012, 02:18 amSolder the leads to a new tube is annoying indeed, but this GI-7B Triode should last a long time, the plate can handle 350W in micro-wave range, then in audio frequency must withstand a 200W as maximum, so using it with 100W plate dissipation, it may delivery around 30 healthy W and last forever.Really strange that this new ''Amazing'' are using lots of the Carver small ribbon tweeter and Gilmore Audio continues using the wonderful Carver planar fullrange driver in glorious 60 inches... I do not understand this move of Bob.Gilmore even cut the price +50% for the big Model 2, from $12,950/pair to now $6,000/pair.
Solder the leads to a new tube is annoying indeed, but this GI-7B Triode should last a long time, the plate can handle 350W in micro-wave range, then in audio frequency must withstand a 200W as maximum, so using it with 100W plate dissipation, it may delivery around 30 healthy W and last forever.Really strange that this new ''Amazing'' are using lots of the Carver small ribbon tweeter and Gilmore Audio continues using the wonderful Carver planar fullrange driver in glorious 60 inches... I do not understand this move of Bob.Gilmore even cut the price +50% for the big Model 2, from $12,950/pair to now $6,000/pair.
The new driver group can handle a lot more power. The tweeter isn't a ribbon, but a planar magnetic made by HiVi. Carver says he is the original designer, and I'll take his word on that one. I've been using that same tweeter for years. I once used a group of four with Eminence mid-woofers and a 6DB crossover. I also remember trying a 24DB acoustic crossover, but it didn't blend as well. A LOUDspeaker any amp could drive. Carver's flock of mini-woofers probably sound very nice. You would need a pair of subs, but I'm sure he has a couple of deluxe models ready to go.Steve
Quote: Have you noticed that many hi-end audio web sites, never mention the prices for their equipment.Guy,For factories that had dealers this is a bit usual, but for factories that sells direct this is strange indeed, but what annoys me most are the manufacturers that do not inform the data sheet of technical equipment.
