audio-talk

just at my last post versus Scott's before it - who says audiophiles only listen to Norah Jones and the Floyd?

Discovered this earlier in the week - it is the best performance of La Boheme I have ever heard, period. Just bought an early mono pressing of it. https://i.discogs.com/OMMVHoCARxUM5RYP0HSh9_jdbE7skwwMfFcbtPpevlw/rs:fit/g:sm/q:90/h:600/w:599/czM6Ly9kaXNjb2dz/LWRhdGFiYXNlLWlt/YWdlcy9SLTI5OTMy/MjAtMTQ...

Dammit I wish I'd seen this before COB on Friday as I may have been able to take the day off. Bugger.

I just bought this bad boy. The idea is to design a mono power amp and power supply around it, specifically for playing Meredith's 78rpm records and other early mono stuff, probably into a big single-driver corner speaker. (Mr Cresswell Jr you will likely have mail soon). Cost me less than I thought...

Downloaded and installed KiCad 7 to my desktop and getting it sorted out so that it's ready to go for the next project. I have to say, much as I love it, the library management protocol is terrible, especially if you are trying to configure it to be usable with a cloud drive across more than one dev...

That's rather adventurous. The paradise was a bjt version of the same idea and certainly sounds good. I think PCB layout will be a big part of the work. I do note that the article suggests that the first stage can drive <600 but that's far from saying that it should. They then load it with a 20k ne...

Well, I've managed to get the response a lot flatter than before. I got my Spice sim of the circuit up and started to experiment to see if dropping any of the resistor values would act to bring up the missing top end. Practically, this would mean I'd only need to solder an additional resistor in par...

Okay, so after much pondering I've decided to take a chance and go down the current-input route with the Proteus circuit (Erno Borbely and Sigurd Ruschkowski, Linear Audio Vol 6, Sept 2013), but with LCR RIAA lovelyness in the middle. From the research I've done, it has a very good chance of working...

Depends on the cartridge. It's not a totally universal solution and only for MCs. A bunch of commercial stages do this. I think my current cartridge is about 16 ohms coil impedance, but the one I'm buying this year has a coil impedance of about 3 ohms. Seems ideal to me. Naturally I'm doing lots of...

Not discounting any design options at this stage (cos I still effectively have a clean sheet) I'm currently studying a Linear Audio article I purchased a couple of years ago with a current input design for MC cartridges, where you get around the need for a step-up transformer by taking advantage of ...

I feel that as the availability of a lot of these things tends to zero many of the traditional choices and designs will become impractical. This is why I'm still periodically getting cold feet over this - I don't want to put a whole heap of effort and expense into something that I can't use after 5...

Forget the number but there is a Russian high GM pentode that works as well. But I remember measuring some and finding two sets of curves as if there were two construction types. Yeah, the 6J52P - I think I saw a post from Kevin of K&K Audio mentioning those, that he also found them all over th...

izzy wizzy wrote: ↑Thu Feb 23, 2023 5:31 pm D3a last for ages. In the end they are vfm.

Rated to something like 10k hours IIRC?

Ha ! How about £25 each nowadays ? I should have bought more :roll: More than that, at least the two I've bought were. And this is a perennial worry because I didn't get in when they were cheap. I found some NOS Siemens for sale from a Netherlands supplier at a reasonable price that seemed perfect,...

Nick wrote: ↑Thu Feb 23, 2023 8:40 am 5687 CF is about 100R output impedance, and it does have feedback wrapped around it. I would check if its a problem before you try and find a solution. But YMMV.

Ah yes, that's the feedback into g2 of the D3a isn't it, I should be able to work that one out.