DIY Hybrid poweramp noise and hum problem - diyAudio
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Old 30th April 2006, 08:28 PM   #1
maxpou is offline maxpou  Canada
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Unhappy DIY Hybrid poweramp noise and hum problem

Hi everyone,
i have diy hybrid power amp no feedback with tube 6922 input circuit SRPP and 6 output mosfets IRF130, 9130 class ab. My power supply for output stage 1 transfo by each channel and 20000uf by rail. PS for tube is regulated by this circuit (see this adress)
High Voltage regulator PS
i have a noise and hum how i place my GND? thank you!!!
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Old 30th April 2006, 09:10 PM   #2
jleaman is offline jleaman  Belgium
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Can you show us an pictures how you have it connected now and have it running. ? what about a full schematic ?
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Old 2nd May 2006, 12:21 AM   #3
maxpou is offline maxpou  Canada
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Hi Jleaman, thank's for your answer.
here the schematic of my poweramp.

description of wiring gnd:
1- input rca gnd is on resistor input to gnd
2- all gnd of tube circuit is on my transfo CT
3- low voltage gnd is on transfo CT and there is a aluminium jumper which connect each channel and ground tube circuit.

thank you!!!
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File Type: jpg poweramp schematic.jpg (50.8 KB, 345 views)
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Old 2nd May 2006, 06:06 AM   #4
jleaman is offline jleaman  Belgium
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Is this all on a bread board or is it on a circuit board ?
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Old 2nd May 2006, 11:36 PM   #5
maxpou is offline maxpou  Canada
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Hi Jleaman,
i have three boards, one for my power supply, one by channel with small circuit bias for mosfet. i don't have a board for my big cap because it's a cap with screw. thank you!!!
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Old 7th May 2006, 04:37 PM   #6
maxpou is offline maxpou  Canada
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Hi,
somebody can help me to find my hum and noise problem? thank you! Maxpou
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Old 7th May 2006, 04:53 PM   #7
Ryssen is offline Ryssen  Sweden
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You don´t have a schema with all the components values on,and any data on the amp?
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Old 7th May 2006, 04:55 PM   #8
rdf is offline rdf  Canada
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Let me begin by stating I'm a solid state 'idjit', but if someone handed me that circuit to diagnose the first thing I'd do is remove the tubes and clip a couple thousand ohms across the interstage switch to see if the hum disappears or changes. The output stage gates don't appear to have any reference to ground.
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Old 7th May 2006, 05:26 PM   #9
SY is offline SY  United States
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rdf: It looks to me like they do via the PS rails. Nonetheless, I don't see how that bias scheme could be stable.
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