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Send new message to groupFrom: Ian Thompson-Bell - 22 Apr, 14:09
I have just been working through the math for shunt derived shunt applied NFB around an amp and Ican't get the expected result. Imagine an inverting amp with an open loop gain of -Ao with a feedback resistor from output to input of Rf and an input resistor from signal source to the input of Ri. I get a closed loop gain of: An = Ao/(1+(Ri/Rf)+(Ri.Ao/Rf))...
20 Posts. Last post send by: Ian Thompson-Bell - Tuesday 22 Apr
From: Iain Churches - 21 Apr, 11:30
Both Tynan and Eeyore seem to have disappeared. Perhaps into a thermionic vacuum:-) Does anyone know the state of play with the RAT tube mixer? -- Iain
69 Posts. Last post send by: Iain Churches - Monday 21 Apr
From: dg - 21 Apr, 10:58
I need a schematic for Fisher x100-a. Thank you
1 Posts. Last post send by: dg - Monday 21 Apr
From: BretLudwig - 21 Apr, 05:56
Mercury-Vapor Rectifiers in Audio By John Atwood >>"Lynn’s Mercury Vapor rectifiers One of the more eye-catching features in a lot of home-built “extreme” tube audio amplifiers are mercury-vapor rectifiers. Their hazy blue glow that is modulated by the current draw of the amplifier adds to the organic life that attracts people to vacuum tube...
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From: Fred Jones - 21 Apr, 02:07
I nicked the 1 inch gold foil strip that runs down one side of a brand new PT .. Have I done any damage ? I ohmed various pri/sec leads coming on the xformer and I didn't find any that connected to it.
5 Posts. Last post send by: Fred Jones - Monday 21 Apr
From: Tube747 - 20 Apr, 13:42
Dear all, After reading all you guys' postings, I decide not go for the 300B push pull with multi output valves! I'm rather go for a much simple approach -- SE amplifier with 300B XLS output tube. This is actually my friend's suggestion. I want to use a WE 437A driver tube and then transformer coupled to the Emission labs 300B XLS with parafeed output...
1 Posts. Last post send by: Tube747 - Sunday 20 Apr
From: Steve - 20 Apr, 03:09
Pictures on alt.binaries.pictures.radio So far no one has been able to figure out who made it, model number, or when it was made. Maybe someone here knows. TIA Steve
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From: 33-45 - 19 Apr, 04:49
Going cheap...search carefully http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&Item=130215858375&Category=14998
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From: Patrick Turner - 19 Apr, 03:29
I've just finished installing a pair of replacement Hammond OPT into a Jolida 502 amp and have Svetlana winged C 6550 outputs. Aahhh, music. I had been testing an old Akai and an old Sonab all week to to make sure they were OK after their repairs, but of course the tubes were refreshing to return to. I mentioned in my other posts about what i did to...
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From: WB - 19 Apr, 03:21
The only rectifier tube I have is 5u4g, and it seems like a real over kill for a 18w project I have in mind ( 2 x el84). The heater current alone is 3 amp .. I take that is *peak* current when b+ is drawing 350ma (max)? Is it safe to assume running 100ma load will draw 1.5 heater current ?
4 Posts. Last post send by: WB - Saturday 19 Apr
From: Ted - 19 Apr, 00:50
http://www.starturl.com/Marantz8B
1 Posts. Last post send by: Ted - Saturday 19 Apr
From: Jon Yaeger - 18 Apr, 16:38
Two photos of work in process: www.yaegeraudio.com/bass_amp_frt.jpg www.yaegeraudio.com/bass_amp_btm.jpg I added a couple of terminal strips to accommodate the extra parts (e.g. Grid resistors, etc.) Transfer lettering was used, followed with a coat of protective acrylic spray. I regret that the folks who make DataKote have discontinued the matte finish...
1 Posts. Last post send by: Jon Yaeger - Friday 18 Apr
From: diecasthoop - 18 Apr, 04:01
I found an old amp that has a 6L6 and 5Y3. The other two sockets are empty. One has the wire that would plug on top of the tube. If any one knows what model this is I can try and find a schematic. How do I figure out what tubes to use if I can't find any info? Thanks, Al http://i138.photobucket.com/albums/q276/bondo3/HPIM0171.jpg http://i138.photobuck...
1 Posts. Last post send by: diecasthoop - Friday 18 Apr
From: aristogeiton@audio-tube.com - 17 Apr, 08:52
Hi there, just look for seller id aristogeiton to check out what is available this week on Ebay (such as ECC32, ECC35, GZ34 metal base, Raytheon 2A3H, WE 102F etc.). Thank's for looking aristogeiton
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From: Soundhaspriority - 17 Apr, 00:52
I always knew Crazy Robert Morein was, well, "crazy". A crackpot. A nutbasket. Two burgers short of a Big Mac. Fudged in the head. You know, "cuckoo" <insert ring around the ear gesture>. Ever since Crazy Bob turned into Mark David Chapman and started believing he was me, and signing his messages with my name, I became convinced this guy was a "lunatic among lunatics"...
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