Well the torpedo runs its LEDs at about 0.5mA (low efficiency types like yours). If you're happy with voltage you get In practice using these LEDs at low current thn that's fine, just don't necessarily expect it to match what your theory suggests... When it comes down to it it's reality that counts

I'd try to avoid running LEDs under 3mA as their Vf can be a bit variable in low current situations. But I have seen some amps running them at ~1 mA but they require more matching iirc. I just saw this thread as I've been away from the forum for a few days. I too would urge you to try the amp...

That's a linear pot, you can tell by the B marking, theoretically you could use it but your volume control would not seem very natural 

If you're powering your CMOY from an a DAP through it's standard headphones port, ,it'll be fine, however if you're coming straight from a DAC it may be a bit dodgy depending on the output power of the DAC and if it has any buffering.   I doubt it'd be an issue and personally I would just...

It's done.   I just connected from the power jack to the case by connecting a jumper to the side of the connecter and clamping it between the case and rear panel. The amp is silent all the way to the noise floor of my usb powered DAC :) I did a quick RMAA and all it really shows is that my...

I've almost finished the casing on this amp using a slightly taller box so I don't have to worry about the height of the to220 packages. However I have some hum since putting the amp into a metal enclosure, the noise level increases a fair amount if I touch the pot, but I can't really see a way...

Sorry, not meaning to hijack this thread, but I'd be interested in an output cap-free crack mod. A cursory 5 minute google search didn't reveal any such page. Any chance you could post a link Duncan?   on topic: +1 for the Beezar amps, If you were happy with a hybrid amp, then I bet you...

I think it could become useful resource. IMHO for beginners it may be a good idea to include hybrids as they are more approachable, but for your thread the decision is of course yours. I've just finished what I believe to be quite an interesting hybrid that I'd be happy to document in said...

I'd be happy to provide the knowledge and advice that I can to such a thread. It's always nice to have more solder slingers building projects. I've really enjoyed following your thread over the past few weeks. :)

It is a slight mod, the bias point for the MOSFET and valve heater has to be moved slightly. Here's the page for the mod with the schematic: http://diyforums.org/SSMH/SSMHvariants.php This amp sounds good on its own, but if you want a slightly blacker background (also increases the gain...

That did it!!!   I put the SMPS module between the 2 rails (still set to 12.6V) with the heaters in parallel. (Screw the dissipation for this test!), with my most sensitive headphones there's only a slight pink like noise in the background.    Thanks so much for all you help chaps! I'll...

I'm just about to try stringing them between the two rails, I've returned to the smps (cheap lm2596 module) to regulate their supply and it was actually quieter than a resistor, leading me to believe that it is related - at least in part - to loading. Before I poked around too much I had to...

I installed a ground loop breaker as soon as I heard how noisy the amp was, however I didn't, and still haven't installed the diode bridge. From what I've read the resistor and capacitor make the loop breaker and the bridge is there for safety in high power amps. This isn't very high power and I...

Well, I spent a whole day on this, and around lunchtime I had it to a point where I was pretty happy with it, but I decided that some of the noise was coming from the heater cables, so I replaced them with shielded ones and moved a few things around, now it's much worse than it was. I tried...

Thanks for the link, I'll read the paper tomorrow. Yes,everything is in the same chassis (1.5mm steel plate) and I have a ground loop breaker installed :)