audio-talk

Mike H wrote: ↑

Tue Nov 12, 2019 7:28 pm

Jeez wish I never mentioned it LoL

You have my sympathy.

I assume because the choke isn't shielded from the steep dV/dt slopes from the rectifiers, the choke sees greater current swings, and hence the max flux it has to cope with must rise. Hence bigger core required. Probably also higher insulation rating, if that requires any change, though I suspect mo...

Topical subject -
http://hifiheroin.blogspot.com/2019/11/ ... l-etf.html

Vic bits below. As I remember it, I took it out of use because the floating carrier for the arm was rubbing against the channel in a couple of places. I suspected the ali channel had warped slightly due to being epoxied to the wood. I wondered if a bit of a re-grind using the carrier and some carbor...

Stop donating LP's to Oxfam then, that's disgraceful.
They overprice their stock as well, any that have any value.

Further fettling has yielded some rewards. I managed to get some 1mH air-cores with 1mm wire ( 0.4R) Now I have a slightly lower high-pass on the ribbons , with 3.9uF/1mH into them, About 3kHz I think, the slope is transitional in that it's 1st-order around 3kHz but steepens to 2nd-order lower down....

Top notch !

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"[URL=https:///][/URL] upload image



Nope, not getting this to work.

Nice today managed my usual 17 mile out & back. This time with pictures !
..or not, can't get the links from imggmi to work. It was easy last time I tried this on tinypic.

I'll take a photo later , it's not as good as the later one Ant showed, but might be OK for experiments.

Acrylic is a good material , go for that if you can get it at a reasonable cost. On the motor, just think about what you need from this. It needs to be smooth for HiFi, low-cogging, it's not just about torque. ps. if you want any bits from an old air-bearing arm I used, early version of Vic's trans-...

Winter has started here - Not been out on the bike then! Funny you should say that.. I have intention to venture out on the bike tomorrow if it is dry as suggested. To be fair the snow is a few miles out of town here. However the neighbours have just come back from Oswestry where there was snow at ...

Ah, very good. I seem to remember that years ago when I built my first series-reg supply for the main amp, I had a problem like that.

Winter has started here -