Search found 18 matches

by Ageagainstthemachine
Mon Jun 10, 2024 7:15 pm
Forum: DIY
Topic: Grounding arrangement for dual mono passive pre
Replies: 6
Views: 6340
Great Britain

Re: Grounding arrangement for dual mono passive pre

Daniel Quinn wrote: Mon Jun 10, 2024 7:07 pm You think there is a right and wrong answer .., go figure .
There's several ways you can go about it which is why I thought I'd ask the experienced and knowledgeable members of the forum.
by Ageagainstthemachine
Mon Jun 10, 2024 6:22 pm
Forum: DIY
Topic: Grounding arrangement for dual mono passive pre
Replies: 6
Views: 6340
Great Britain

Re: Grounding arrangement for dual mono passive pre

I suspect NVA will call such knowledge commercially sensitive although I don’t know . My advise would be to try various methods and listen . There isn’t no substitute for empirical knowledge I'd be surprised if they did as it's not special tech but a simple grounding layout. I'm sure someone with e...
by Ageagainstthemachine
Mon Jun 10, 2024 5:31 pm
Forum: DIY
Topic: Grounding arrangement for dual mono passive pre
Replies: 6
Views: 6340
Great Britain

Grounding arrangement for dual mono passive pre

I'm currently in the process of making a dual mono passive pre and would like advice on whats best for grounding, should I tie the inputs to the outputs and should they be grouped together or ground individually? I'm using the elma 48 position mono attenuators, should they be grounded, if so to whic...
by Ageagainstthemachine
Sat Sep 09, 2023 5:04 pm
Forum: DIY
Topic: Attempting to solve hum on p80/s300
Replies: 23
Views: 28430
Great Britain

Re: Attempting to solve hum on p80/s300

What about noisy mains ? Is the humming more or less at certain times of the day or on certain days ? Fridges, freezers, washing machines ? Industrial usage in your neighbourhood ? Solar panels ? All things that RD used to moan about as NVA amps are sensitive to that. I have an open living room/kit...
by Ageagainstthemachine
Wed Sep 06, 2023 11:21 am
Forum: DIY
Topic: Attempting to solve hum on p80/s300
Replies: 23
Views: 28430
Great Britain

Re: Attempting to solve hum on p80/s300

20230906_110826.jpg I spent the day moving things around. This is about the best I can do for component separation, any cables that have to cross have been crossed at 90 degrees.. my digital gear is to the right of the pic but the hum is still there. When I next get chance I will play around with a...
by Ageagainstthemachine
Sun Sep 03, 2023 1:36 am
Forum: DIY
Topic: Attempting to solve hum on p80/s300
Replies: 23
Views: 28430
Great Britain

Re: Attempting to solve hum on p80/s300

I also have a Topping D30 in use and it is a very basic (but surprisingly good) little DAC that can generate unwanted 'noise' when idle. My recommendation would be to get a newer-generation Topping or similar (SMSL, Sabaj, Loxjie etc.) unit that will improve your SQ and have a better build with reg...
by Ageagainstthemachine
Sat Sep 02, 2023 11:47 am
Forum: DIY
Topic: Attempting to solve hum on p80/s300
Replies: 23
Views: 28430
Great Britain

Re: Attempting to solve hum on p80/s300

To save starting another post can anyone advise on rca interconnect length? I'm thinking about separating most if my sources and my DAC has a high output so I'm thinking about a 5m cable... Would this be OK? I would also run longer lengths from the cassette player but I use a buffer with it so that ...
by Ageagainstthemachine
Fri Sep 01, 2023 7:44 pm
Forum: DIY
Topic: Attempting to solve hum on p80/s300
Replies: 23
Views: 28430
Great Britain

Re: Attempting to solve hum on p80/s300

Thanks again for all the replies. I had another play earlier and found that it is a mixture of environment and noise on the mains. I took the earth cable connected to the phono earth on the back of the pre and touched the rca cables that came from my cassette player (which was unplugged from the mai...
by Ageagainstthemachine
Fri Sep 01, 2023 11:09 am
Forum: DIY
Topic: Attempting to solve hum on p80/s300
Replies: 23
Views: 28430
Great Britain

Re: Attempting to solve hum on p80/s300

Thanks all for the replies. I tried the amp this morning with just the speakers connected and no pre and I Unplugged both the TT and DAC power supply it was quieter, the main buzzy sort of hum has gone but I am left with a very quiet hum if I put my ear right next to the speaker. I am wondering abou...