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Old 9th August 2004, 12:05 PM   #1
Stabist is offline Stabist  Slovenia
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Default New MC preamp is comming alive

Hi!

I'm finaly almost finished with the chassis for my MC preamp - the schematic is based on CJ PV 10 MC module - so it's a tube preamp ...

The chassis is divided into two parts - one for PSU and one for circuitry ...

I just have one queston opened yet - where to put the ground conector - as close as possible to RCA's;? as close as possible to power cord;? somewhere else??

I've purchased my first more serious TT combination (Kuzma Stabi/Stogi Reference/benz micro Glider; ofcourse second hand)- so I' don't have proper experiences yet - it has two ground wires - one from the motor and one from MC head - should I connect them to the same GND conector?

The thing is - preamp itself was allready mounted in temporarily chassis - to test it - but the hum was BIG And it dissapeared when I touched the chassis or when I fiddled around the ground connector ..

Oh - btw - should I conect the ground from 220V outlet to GND conector or somewhere else to the chassis?

Thanks in advance for your help!!!

Oh - and I've made some pictures of an almost finished chassis
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Old 9th August 2004, 12:06 PM   #2
Stabist is offline Stabist  Slovenia
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another view
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Old 9th August 2004, 12:10 PM   #3
Stabist is offline Stabist  Slovenia
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and another
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Old 9th August 2004, 12:11 PM   #4
Stabist is offline Stabist  Slovenia
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And the last one ...
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Old 10th August 2004, 09:58 PM   #5
EC8010 is offline EC8010  United Kingdom
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You need the incoming mains earth to connect to the chassis as firmly as possible in order to provide a safety earth bond.

For minimum hum, you want the 0V of your pre-amplifier to connect to chassis by as short as possible a path from the star at the grid leak and cathode resistor. Use twisted pair to go to the phono sockets, and ensure that they do not contact the chassis.

(You would have done better to post this question at the "tubes" forum - it was pure chance that I saw it!)
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Old 10th August 2004, 11:40 PM   #6
Stabist is offline Stabist  Slovenia
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Thanks for advice!

And you're right - this is really more a question for "Tubes" section ...
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Old 10th January 2005, 12:46 PM   #7
Stabist is offline Stabist  Slovenia
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Default Finnaly the chassis is finished :D

FINNALY!!

After more than 5months!!!! the chassis is eloxated ... Well, this was a saga of some kind ...

So - few impressions:
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Old 10th January 2005, 12:52 PM   #8
Stabist is offline Stabist  Slovenia
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The sides will be from cherry wood ... so it's a little bit similar to PD's GC chassis - altough in this case it wasn't his artwork that inspired me - I got the idea before - but my realisation was so slow ...
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Old 10th January 2005, 12:53 PM   #9
Stabist is offline Stabist  Slovenia
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I like the back - I think it looks simple but classy ...
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Old 10th January 2005, 01:43 PM   #10
SY is offline SY  United States
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Some very nice metalworking!
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