audio-talk

Well, no, all it shows now, is that whilst the simple depiction of loops can be helpfull, in reality they are just helpfull constructs and not anywhere near what is actually going on. That's exactly what they are; helpful constructs. Helpful in a way so that we do see there is more to this and so u...

Hi Nick,

If I re-drew it like below, would that remove some of the ambiguity you were referring to?

cheers,

Stephen

Tho' I'm still not clear why you think the input and output modules need to share a common ground plane, however? I would have though they would be better separate. They need to see the exact same reference point AC wise not contaminated by PSU DC and noise or any noise picked up on long wires. The...

Yes, but all I am suggesting is that the choice of input creating or output sampling can be done at any part of the RIAA circuit. (and in fact given the nature, will vary with frequency). OK, if I understand you right, then you are saying that say for HF EQ, the loop might be slightly different to ...

Hi Nick, The AC signal has to travel through the EQ in the loop I've drawn to generate the signal across the EQ output so the input of the following stage can sample it with it's input. The output of the first stage comprises 3 elements in parallel. The valve, the anode resistor with PSU cap and the...

Hi Andrew, I think of the layout in terms of AC loops. I try and make the AC loops unambiguous. To attain this, the AC signal should only have one clear path where possible and should be seperated from any DC loop. There should, for any input and output, be one clear reference point. This is an aim ...

Hi Andrew, Yes they are. I have them at 1:20 but I've never experimented with loading or a different ratio. I'm a bad analog person :oops: Mainly coz it looks like a very painful thing to alter the ratio so lazy me hasn't. I think the reflected load would be about 117R and that's about right from wh...

The whole box thing is soooo over-rated :wink: . Nice if you can do boxes but there's really no need. But our projects have to be acceptable and safe if to be used in public/family spaces so I use "breadboard in a box" style. It always sounds better on the bread board and it's so dishearte...

The whole box thing is soooo over-rated :wink: . Nice if you can do boxes but there's really no need. But our projects have to be acceptable and safe if to be used in public/family spaces so I use "breadboard in a box" style. It always sounds better on the bread board and it's so dishearte...

I feel your pain Andrew. Recently I thought I could liberate some space in the audio case of my phono by moving the last set of HT chokes to the power supply box. For the first time in years, I got hum. No matter how I oreintated them, they still picked up stray fields from the other chokes and tran...

The SpeakOn series is rated at 250V AC which is 350V peak so I believe good enough for 350V DC.

cheers,

Stephen

I use SpeakOn connectors and find them great

cheers,

Stephen

And another opinion to throw in the mix http://www.audioasylum.com/forums/KandK ... /6742.html

cheers,

Stephen

Hi Steve, Looking at the voltages for the 5687, it seems you're running about 3mA or so down each one. That looks a little low to me and looking at the datasheet, it would seem the valve is runnung down in the curvy part of the plate characteristics. At low currents, they might indeed be a bit dark ...

Hi Simon, Looking first at the HT supply in your first post, that looks a good place to start. I actually also added 4 No. 1R 3.3uF RC sections which aren't shown; two per stage, one per channel. This part got me a bit confused. If you mean you fed each stage/channel with these RC combos, then I wou...