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Old 25th August 2010, 01:16 PM   #1201
AndrewT is offline AndrewT  Scotland
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I agree with Ud, remove chassis and layout the modules in a string, Mains at one end, then through the stages, to the input RCA at the other end.
Couple up and power up.
Is hum or buzz heard and/or measured.
Connect as a stereo pair. Test again, measuring the hum or buzz.

Remove the source leaving the RCAs unterminated.
Does the noise measure worse?

Now that you know what the system can achieve, start casing it up.
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Old 25th August 2010, 01:16 PM   #1202
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Quote:
Originally Posted by udailey View Post
pmchoong, please make sure of these things:
1: As with the other gentleman your rcas should be insulated from the chassis. (its okay that they touch but it can cause ground loops which will buzz)
2: Do you have signal going to signal or do you have signal and ground switched around on your RCA plugs?
3: this buzzing can be caused by bad solder joints and if you made your own RCA cable there could be bad joints there or you could have bad joints in your input RCA jacks on your chassis.
4: solder joints could be bad at signal input to amp boards.

....That covers bad solder joints I guess. .... Wiggle the wires, touch the volume pot, touch the heatsink. Does the hum/buzz change when you do this?

Uriah
1) I have removed the rca from the chassis
2) Signal wire going to signal and grd wire going to ground
3) will check
4) will check

Thanks. Yes...wiggle the wires (that connects the rca and the board) and the buzz gets real loud....depending on how gentle or rough you wiggle them.
Will check again on solder.
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Old 25th August 2010, 01:45 PM   #1203
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do i need to connect the 'chg' from main board to the chassis? Did this and resolder the joints, now the buzz is less but when connect to preamp, the output from source (my radio for testing) is very faint.
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Old 25th August 2010, 01:47 PM   #1204
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"With dual mono version though, you will run a ground wire from CHG (chassis ground hook up point on each amp board) to chassis." post 168 from peter
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Old 25th August 2010, 02:31 PM   #1205
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connected the cg
hg to the chassis...resoldered joints....still buzz when connect to preamp. sound from radio is very faint.
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Old 25th August 2010, 02:37 PM   #1206
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now when i wiggle the rca wires....the buzz remains at same loudness. the buzzing sound is much lower now...but constant....sound from the radio is at background...can be heard when turn preamp volume to maximum.
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Old 25th August 2010, 02:43 PM   #1207
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Are you using dual mono or stereo setup? Do you have buzz with only a single channel connected to PS?
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Old 25th August 2010, 02:44 PM   #1208
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i am using dual mono....buzz in both mono
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Old 25th August 2010, 03:04 PM   #1209
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Is there buzzing when signal connected to one channel only (the other channel completely disconnected)?
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Old 25th August 2010, 03:10 PM   #1210
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ehhh....i use the same transformer to test each individually
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