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Old 5th August 2012, 11:40 PM   #261
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Just read an article where Nelson explained how the name of the adcom GFA came about.
Hint: it contains an expletive
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Old 6th August 2012, 05:04 AM   #262
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aha

got that

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Old 6th August 2012, 11:19 AM   #263
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So, even my 5400 is a GFA
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Old 6th August 2012, 11:58 AM   #264
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The name says it all
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Old 7th August 2012, 05:25 PM   #265
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Well, it looks a litlle like an N.P. design, a little but not much. It's 3 stage, with a diff amp input w/tiny IRF FETs, the same FETs as VAS but, cascoded in the VAS, and an F4 looking output with .56 ohm Rs. Kinda BA-2 looking circuit I guess. Extra biasing and shut down and safety stuff. Wimpy PSU with 1 12,kuF cap. Output bias is aB, (maybe 60mA/FET Iq w/3Pr.). They say it gets warm??? I don't think so. They atribute that to classA? Nota! But it is good for bass. I use it with a(1) JBL2226 in a open baffle U box. I would by another but the Nedymium(SP) magnet thing made 'em go from $330. to $500. I'll think about it sumore...
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Old 7th August 2012, 05:31 PM   #266
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O.K. Back to the regularly scheduled pgm... What about the 085??? I think I can put together a test circuit of the SRP type... I want to drive some resistive looking ribbon tweeters??? 6 ohm??? high output Z should not bother me right? but the sweet sounding Mu follower i might like. I'm deaf in 1 ear and can't hear outa the other. I've loved ribbons ever since I could hear! I'll invite friends over...
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Old 7th August 2012, 05:34 PM   #267
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I hope, with hope being the key word, to be listening to r085 version of F2 tonight. Got ALeph CCS and SRPP in the queue. Absolutely swamped with fet distribution. I need to ask Nelson for a better version of the R085 curves. Need more V and I on the graph. I gotta here OB, although i dont currently have tthe room for it. THe F5T will be doing my down low duties in active setup. Multi output version has such great control. THis is part of my search for top side amp. Got some ADC interstage for F6 attempt with R085. since F6 doubles gain, should allow for low Rs and feedback.
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Old 7th August 2012, 06:25 PM   #268
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Hey, buzzforb, As long as no ones complaining about OT stuff. Am I on your list some where fore FETs? I just think I'm getting lost in all this F5X and FET GB stuff... I'm just wondering if I'll get a PM sometime. I can wait, but, I don't want to find out in the end I was looking at the wrong list or something???
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Old 7th August 2012, 07:30 PM   #269
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I have a print out of the list which breaks it down into pages. I am doing them a page at a time. Somehow the list got sorted alphabetically, so the people who signed up first are not necessarily at the top of the list. Good news is that i believe you are on the second page, which i am about to start. Shhould get an email tomorrow about details.
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Old 18th December 2013, 11:09 PM   #270
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Quote:
Originally Posted by buzzforb View Post
I hope, with hope being the key word, to be listening to r085 version of F2 tonight. Got ALeph CCS and SRPP in the queue. Absolutely swamped with fet distribution. I need to ask Nelson for a better version of the R085 curves. Need more V and I on the graph. I gotta here OB, although i dont currently have tthe room for it. THe F5T will be doing my down low duties in active setup. Multi output version has such great control. THis is part of my search for top side amp. Got some ADC interstage for F6 attempt with R085. since F6 doubles gain, should allow for low Rs and feedback.
Buzz,

Well, how did this come out? What was best?
Was the amp a keeper?

Rush
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