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24th February 2010, 01:06 PM
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#172 | |
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diyAudio Member
Join Date: Feb 2005
Location: Bucharest
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Quote:
VISHAY SILICONIX|SST404-E3.|JFET | Farnell España |
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20th May 2010, 09:27 PM
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#174 | |
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diyAudio Member
Join Date: Jan 2007
Location: Berkeley, California
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Quote:
Have you been successful on locating dual JFETs? SST404 is a low gm device and 2N3954~8, LS843~5 and 2SK30 (single) fall into the same group (2~3 mS @ 1 mA, something like that). Gluing together two 2SK30 whould be the cheapest solution but the DC drift can be a nuisance. Good luck! Satoru |
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9th September 2010, 01:30 PM
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#175 |
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diyAudio Member
Join Date: Jun 2009
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eti 5000 rebuild with exicon`s
i have the amps running with exicon fets ..only the 125 watt ones yet to try the 250 watt ones yet if you want the detailed mods i did to the amp to rebuild it please email me and i would be glad to help you with everthing {i was the manager of the kit dept from 1983-1987...sparkey@hotkey.net.au
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17th April 2011, 01:16 PM
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#177 |
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diyAudio Member
Join Date: Jun 2009
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from sparkeey ,,i have looked at your amp pic`s very nice i must say ..on the otherhand i have been building the eti 477 amps mow for 27 years ..i can do it blindfolded... although i have made quite a few with exicons now and was wondering if the 470 pf by pas caps on the drain sorce need to be alterd in capacitance i also changed the gate resistors to 680 ohm and have made a few other mods with the help of ian ...regards brian ..sparkey@hotkey.net.au
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3rd June 2011, 01:36 PM
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#178 |
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diyAudio Member
Join Date: Aug 2007
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if any one interested, the SST404 is found at Future Electronics (is a Calogic distributor)
Search result for : sst404 - Future Electronics |
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17th August 2011, 11:13 PM
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#179 |
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diyAudio Member
Join Date: Aug 2003
Location: 3370 Vikersund
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I have vistit this adress:A HiFi Power Amp
I find this amplifier very interesting. In her schema I do wonder what are connected to T7, 8,9,10 and 11?? I wrote Suzie a mail, but have not got any answer. Any one who knows?? Eivind Stillingen |
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18th August 2011, 06:06 AM
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#180 |
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diyAudio Member
Join Date: Jan 2006
Location: Sydney
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I thought it was obvious, so didn't explain in the text.
They allow you to run the input stages off a different power supply to the output stages. The latfets have ~10-12V Vgs, which means that in order for the output to pull hard to the rail, the gates have to be pulled beyond the rail. The idea was that you could run the output stage off +/- 56V @ 200+ W, and the input stages off +/- 65V @ 5 odd W. That way you'd get a little more than the usual 140W into an 8 Ohm load. In practice I just bridge T7-T8, and T9-T10, and leave T11 unconnected. |
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