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9th March 2003, 06:31 PM
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#1 |
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diyAudio Member
Join Date: Nov 2002
Location: Viña del Mar, Torreon
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417A Line Amp
This is a 417A line amp using Ladder attenuators. Power supply is SS with independent mosfet regulators with only one voltage reference.
It will be modified with output transformer to have an Euridice type circuit. |
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9th March 2003, 07:05 PM
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#8 | |
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diyAudio Member
Join Date: Nov 2002
Location: Viña del Mar, Torreon
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Re: Diyer at its best!!!
Quote:
Jorge, The photos were taken at the end of the construction proccess and since I have made some changes. The screws of the band brace were to big and had some interference with the att bracket so change them with some nice steel couplings, custom made. I should take some new photos. |
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9th March 2003, 10:07 PM
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#9 |
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diyAudio Senior Member
Join Date: Aug 2002
Location: Belgium
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417A
Hi,
Nice job. I don't know whether RS Components have an outlet in Mexico, but they do have shaftcouplers. That should save you the time to make your own. Happy with the sound of the pre? Cheers, 
__________________
Frank |
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9th March 2003, 11:30 PM
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#10 | |
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diyAudio Member
Join Date: Nov 2002
Location: Viña del Mar, Torreon
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Re: 417A
Quote:
There is a RS Components around this small City but they carry very few parts and have not restock since at least a year!!! Little interest in electronics arround town, only students. Monterrey and Mexico City is another thing. Sound?. Well still tweeking, What I can say is that is has a much more control over the 10K load than with the 6922 previously used. Note also that it is more neutral on overall character, and better high freq. Have change the plate load resistor which were carbon film (and magnetic) with a couple 1/2 W carbon comp. (the only ones I had at hand) the sonic improvement was like night/day but unfortunatelly the power dissipation was way bellow what I needed (at least 2W) and so after a couple of hours they began to get noisy. At this point I'm stuck with what to use as Plate load R since I can't get others than carbon or metal films around town, all magnetic. So in the mean while will install some 2W X2 wire wounds (sandy non magnetic) and see what happens. Other tweeks I've made are on the HT regulators, bypassed the zeners and series output devices with good quality 0.01u polyprops and in some cases adding also a 0.47u. This addition smoothed the sound but still have some gritiness at high feq, not much. Suggestions to gritiness other than tube series regs? |
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