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One and a half

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About One and a half

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  1. Who said large corporations don't innovate...? Honda has made a limited number of AC power inverters, where the source is lithium ion batteries and has a similar frame to their classic fuel generators made since 1959. The sine wave output is of interest and Honda made a model specially for Japanese Audio enthusiasts, the LiB-AID E500 for Music. The rating of 500VA from at 100V output would support a system capable of 200W output power. For how long...? The inverter is capable of switching to either 50 or 60 Hz intended for the regions of Japan, which for export is very handy, 60Hz belt drive sync motors for turntables come to mind. The LiB-AID E500 for music is priced at USD2482 (JPY270,000) with only 200 made for the Tokyo motor show as concept models. The translated Japanese to English review is attached to this post from Phile Web. Honda's Website info. Lib-aid 500 Review.txt
  2. Beauty of this situation is noise generated from added equipment would be next to nothing, cause of the low impedance from the power amplifier. Agree with @sandyk with a suitable relay, 10A should be plenty, most can switch 230V ac with no issue so 24-120V speaker voltage is fine. To prevent oxidation, find a two c/o relay with silver contacts, less voltage drop across the contacts as well, however small relays have rather limited current capability, just depends on the relay. Add a 4A diode across the coil (Anode to -Ve on the relay) to prevent turn off spike. Recommend 12V relay as they are common as well as PSUs for them. A DIY solution will still take some effort as drilling out the box for the connectors takes a bit of time. my guess with some care would take a day or more, finding the drill bits or holesaws may take a great deal of that time up let alone procuring the parts. Find it odd that there's only one output on the power amp, must be an exception, even a lot of Vintage amps have 2 sets of switchable speaker terminals.
  3. Oh, just saw on a computer screen instead of a iPhone screen @philbin, see on the drawing of the amp are numbers in red latters and italics. These are reference voltages that you can measure at these points. Black lead to a chassis ground and the red lead on the identified component. If the voltage measured is not right, the culprit is close by (sometimes).
  4. This would contain crud and avoid a ground loop, or more importantly retain the double insulation properties of the SMPS, unless it has that rotten X cap fitted. For balanced AC, I've found that grounding both ends of the shield benefits, in that case, a strict star pattern for the mains cables is essential.
  5. It's almost as if the mains cable optimisation depends on the type of load. For example to stop RF crud from say an SMPS load, use a shielded mains cable. For a linear power supply, which draws current in lumps, the cable should be increased in conductor size to suit. If the load is a source, the power draw is not so significant, so a smaller than AWG12 is plenty. To cater for both circumstances, recently have used a DIY approach mainly for 3m+ cable in the form of this cable from McMaster Carr. This is a shielded only 18 AWG PTFE, Silver Plated Copper capable of 4.5A, 600V at 148C, more than current enough for sources, 120V or 230V.
  6. To edit your post to make it pertinent and avoid clashes.... "Increasingly, it looks like the real goal when posting is increase enjoyment of music playback" Oh and this: "This consumer protection / saving people from themselves is very misguided. It just doesn’t work and causes more problems than it solves. It’s also presumptuous that those reading want to be saved and that the comments can save them. Live and let live. Nobody is claiming HiFi gear will cause autism. "
  7. Agreed these two are the first to look at since they are involved with a reference.
  8. I’ve been watching 12voltvids on you tube quite a lot Lately and the most common problem for vintage amps are leaky caps (electrolytic) open resistors shorts on the + - rails caused by leaky caps leakage on T01 type transistors the protection relay may turn on prematurely due to a combo of the above. The signal from the source would have to be measured and compared with the rated maximum of the preamp especially and for modern devices is 2V , in those days 0.775V or 1V was common. If the amp hasn’t Ben serviced for quite some time, it’s worth to recap and weed out suspect transistors. Marantz receivers now have a long history of what fails over the years, a service wouldn’t cost that much in time, and gives peace of mind for the next 10 years or more.
  9. Please google super best audio friends. I would bet the experience lasts less than 10minutes.
  10. Erm, steady sine waves are boring, and for me don't prove a point unless driving a speaker or amp for power levels testing. Packet data is where it's at, why didn't Amir play something close to a sine wave like anything from ZZ TOP, where the switch actually has to do some work and not sit around measuring no traffic, don't see the point. Hanging streamer on the end of the EtherRegen would also be relevant and measure what he likes. Testing singularities is useless, need to look at the whole picture.
  11. Thanks to @Cable Monkey, @elan120, @Dutch, @Ehsu for inputs with the JCAT NET Femto. Certainly doable.
  12. Oh, I see the JS2 isn't available until mid Jan 2020, there are only so many hands, huh? Pity you're not in the shoe business, can put you in contact with a crew of elves...
  13. What a bizarre set of photos. Equipment does have ratings labelled for good reason, even car tyres have a maximum pressure rating. Inflating a tyre to double its maximum will have predictable results, same with these outlets, and the cable/connectors.
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