Hi all This amp has distorted audio via RIGHT channel.
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Re: 3020e, NAD amp schematic/advice please
I ran an input via CD/AUX plus Tuner, & then signal via tape out to another amp.
Both channels crystal clear.
Not sure what this proves, except possibly part of the pre-amp working.Attached Files -
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Re: 3020e, NAD amp schematic/advice please
Very strange, after I tested again RIGHT channel fine.
Took a chance & checked all the electrolytic caps, replacing a few mildly suspect ones, plus reflowing many solder joints on the main board.
Also cleaned all switches & controls.
Now working on test.
Wish me luckComment
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Re: 3020e, NAD amp schematic/advice please
Bad connections on the soldering pads are common to most Nad and Proton devices. A recap would be a good idea.Comment
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Re: 3020e, NAD amp schematic/advice please
I have a Proton AM455 Pro - I noticed it has numerous small value electrolytic capacitors (1uF - 10uF 50V for example.
Would it not better to recap these with non-electrolytic same value that are now available, especially those in the signal path?Comment
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Replaced the 2 STK0039 chips , plus swapped the left & right pre-amp drive boards , with no change in symptoms. -
My tv will work for a while and change channels with the remote as it should but then it will stick on one channel only and work ok but it won't change channels. I have tried unplugging it for hours and whilst unplugged pressing the power button on the tv to reset it.
The volume button on the remote still works but it just won't change channels once it decides to stick on one channel
It has built in basic freeview tv here in the uk, I've tried doing an automatic search to reset the tv but nothing works.
I have to turn the tv off and then on again with... -
Anyone run memory speed tests with an old X58-based triple channel 1st gen or any other >2 channel board? The one I have is a Gigabyte I think.
Anyway I had four 4GB DDR3-1333 modules in the 6 memory slots and got around 11GB/sec memory speeds assuming that it went dual channel since it didn't have enough modules for triple channel. Now I stuck in two more 4GB modules, but they are DDR3-1600. I'm still getting 11GB/sec speeds according to memtest86...
Just wondering, anyone do memory speed analysis on these triple (and higher) channel memory boards? Are there any... -
Hi guys,
I need a help with my Marantz pm6005. It started to have weaker the right channel a few months ago, than it got back to normal and now it has lost sound completely on the right channel. At the final stage it was loosing the channel for a while and than it returned. After it has disappeared completely I could forced it back by unplugging the source form CD (which I normally use) to phone and back. It would then work for a few minutes and died again. Now it is possible power up and all function works normally (apart the right channel ) on all inputs, except the phone both channel...01-30-2023, 12:11 PM -
Hi all forum members,
Fyi, i have been working on this old model PCT-4082 (4 channel car amplifier). The owner said only one channel is working.
My initial finding is this amp originally use Toshiba 2SA1943 and 2SC5200 transistor for its output but after opening the top casing i found it used Toshiba A1941 (pnp)and C5198(npn). I desoldered all the 4 pairs transistors and found 1 piece A1941 open(tested "OL" on all legs) and replaced the 1st pair with 2SA1943 and 2SC5200, thats why you can see in the picture it is the bigger size transistor. The other A1941 and C5198 all...
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