audio-talk

can you run a spice sim with a 74 series logic library? I did only simple things with spice. Would probably need some time to get useable results. if you have a trigger at +- 40v, then that will also trigger at +250v? If the problem is the voltage limit of the solid state relay, why not use a mecha...

Nick's mention of Mike's E-choke project reminded me that I have a couple of the boards in my spares box - I might just dust them off and use them in my 300B HPA project. It will improve things as it has been shown on the Tentlabs page but it's not the same as the SLB. I think the active bridge rec...

Ray, I can see that you use 3 psus for your DAC. How did you resolve the problem with different potentials of the ground planes? Any minor hum or not fully "open" sound? And how will you resolve this when you use the tube output stage? I had to struggle with my DAC for a while to clean eve...

For full-range drivers like these, the cone(s) will be bending all over the place. Correcting for that by altering the signal at the voice coil would be immensely difficult. You are right. I was under the impression that Backes& Mueller active speakers would have used in the 90ies already some ...

To control mechanical cone breakup would need a tiny mic mounted on the cone which measures the velocity/acceleration and sends back data for controlling the amp. I have such a thing in my active Velodyne sub. But I was thinking rather along the lines of this discussing like taming some small freque...

As far as speakers are concerned there was pretty much nothing W.E., RCA, Stromberg & others didn't do, apart from digital, network synthesis design method and some of the material developments of the past 50 years. That's what happens when you get some of the best engineers in the world and gi...

Yes, Ray. Standard build, heat sinks like in the picture (get warm after hrs but not hot).

This is the circuit: and this is how it's connected :

SLB circuit.png[/attachment]

I knew that even a little bit of hum can already modulate the music signal with some negative effects but I didn’t expect such a dramatic change. The difference between the original CRC psu and using the SLB is like watching a movie on VHS tape on a 4:3 TV vs. a Blu-ray DVD on a 16:9 flat screen TV....

Ray, there are these nice positive surprises like the Maida regulator or the SLB which are like an island in the middle of struggling with strange phenomena or resolving problems. It was fun to work with these high quality PCBs. The power transistors get hardly warm at 0,8A and there is only about 1...

I don't think you will face any problems. The original circuit (6SN7/6C33)has enough input sensitivity and gain. It depends of course also on the amount of NFB you are planning to use.You can always adjust the 13E1 B+/idle current to your needs which should be easy as it has a lot of reserves to pla...

Ray, I don't have any DC offset issues any more as I tried to explain already because of the better power resistors I use and how I use them. I also don't need the SLB because of any voltage drift or DC offset issues. I need it only for lowest ripple current which should result in the darkest possib...

I forgot to mention that the next lower value (using Avel toroids) would be at 50VCT which would lower DC per rail for about 8V. Don't think that would make much difference regarding thermal issues but would probably throw off the balance I have achieved with DC offset,idle current and sound.

On your Inverted OTL project, wouldn't it be good to minimise the thermal aspect of the DC offset by not having to burn off lots of volts? With a cap multiplier like the SLB you don't need to do that for ripple reduction. If you run separate 'right sized' transformers for each side of the output po...

The SLB is really the best input for me at this moment and I have to study more details now in order to figure everything out. On your Inverted OTL project, wouldn't it be good to minimise the thermal aspect of the DC offset by not having to burn off lots of volts? With a cap multiplier like the SLB...

I will try this, Ray. Thanks! It looks to be ideal for this job considering amps,voltages, heat if I can make it work with the resistors/(smaller value) cap/chokes. Do you know the max input voltage for these boards? I simply couldn't find this information. The thermal issues/DC offset fluctuations ...