Now for the boringness... - diyAudio
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Now for the boringness...

Posted 29th August 2009 at 02:33 PM by wintermute
Updated 25th November 2009 at 12:21 PM by wintermute (categorised)

Last night I built an earth loop breaker for my trusty old Series 200 100W mosfet amp. It's been annoying me with Hum ever since I moved to the new place. Combination of having the mythtv HTPC and also cable like TV antena that is shared through multiple units. Well it cut it down but it didn't cure it.. The gainclone is dead quiet... the differece? I used an 12 Ohm resistor on the gainclone, and it is running without a pre, the series 200 one I used a 10 ohm as per Rod Elliot's article (and the connection is through the preamp built into the amp. Tomorrow I plan set up a switch and some new "direct" RCA jacks so I can run the HTPC direct bypassing the integrated pre.... hopefully that'll do the trick. If not I'll probably try bumping the resistor up to 12 ohms...

Today I was going to glue the back baffle on my second MTM but it got very gusty and I thought it would rain (my work space is on the balcony, so not good for gluing if looking like rain). So I only managed to do sanding. It has a nice fit now, and I drilled the holes for securing the rear baffle with screws..... I didn't screw the one last week and had a hell of a time with it slipping around. Thanks to AndrewT for reminding me of the value of screwing

After deciding not to glue that box, I sanded the other one which has been completed. Nice and smooth now. Also filled the screw holes it does have and a gap at the bottom of the front baffle. Will only need a final sand now and should be ready for veneering.

I'm really looking forward to getting something listenable going! after veneering, comes front baffle chamfering, and then some dreaded measurements and work on the crossover... but I know from before I can get something pretty listenable just by putting a cap on the tweeter and letting the midbass' run full range The risk in doing that though is I may never finish them

Posted in Speakers, amplifiers
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