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DIY HiFi Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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DIY HiFi Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: Re: One step at a time. posted by Victor_A on April 14, 2006 at 19:12:58:
I desoldered the 5 diodes on the PS board. they all tested fine.I spent several hours going over every connection in the amp section, rewiring the filament wires, tube connections, ground connections, etc. the amp still hums - left channel is 2.3mV, right is 1.8mV.
Peter - bear with me :) - i'm familiar with what feedback does, but i'm can't figure out which connections are part of the feedback loop just by tracing the circuit. could you be specificy which wires need to be disconnected? also, what is the heater center-tap?
I had previously removed paint at the circuit ground and safety ground. There is continuity between the ground bus and chassis. Resistance between ground bus and safety ground pin of the IEC socket floats between 0-0.3 ohm.
also, i'm confused by your reference to heater wiring on the PWB. are you referring to the filament wires?
btw - in response to your questions from a while back: this is the P-P ella and with choke.
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Follow Ups
- Re: One step at a time. - tokyofist 16:44:29 04/15/06 (4)
- Re: One step at a time. - PeterP 10:00:11 04/17/06 (1)
- Re: One step at a time. - tokyofist 18:50:38 04/18/06 (0)
- Re: One step at a time. - Victor_A 02:55:00 04/16/06 (1)
- Re: One step at a time. - tokyofist 06:32:08 04/16/06 (0)
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