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Alright, thanks for the voltage suggestion.
One TL062 was faulty, so replacing that seemed to work.
The other board, where the LED stays permanently on, pin 1 and 7 voltages on TL062 stay stationary at 5.6V, and do not fluctuate up and down between 0.5-7V (depending on rate).  It doesn't seem to be a faulty IC, as I swapped out the one that works.
Any suggestions where to look?
Thanks

OK, so I changed both LEDs, and now the voltages read on one board, 0.3V, on the other 1.85V, both 3mm LEDs.
The one with the higher voltage is working, but is always ON, i.e. it is not pulsing with the modulation rate, and doesn't change with the mod rate increasing or decreasing.
I'll have another look at the one where there is insufficient voltage, but in the meantime, any guesses as to why the LED works, but doesn't 'flash'?
Also, could someone explain via the schematic, how the LED turns on/off?  I can see the mod part of the schematic and how changing the rate effects the LED, but my newbie brain can't work out how the LED turns on/off.
Thanks so much
David

I've now built 2 ZPSDX, but I can't get the modulation rate LED to work on either of them.  I have removed the LEDs to check that they are working, which they are, but once they have been soldered in place, they never illuminate.
All other functions work.
I did a search, but couldn't find anyone else with the same problem.
Please help!
Cheers
David.

Could anyone recommend a build that would come close to the sound of a solid state amp,  super tight high gain sound like a Randall RG100es/Dimebag sound?

I'm going to get on it in earnest ASAP. There's a lot of back-end stuff I need to do/learn up on for the website re-design so that's kinda delaying things a bit.

Thanks Brian. Can't wait. Such a fantastic resource for so many people.

Hey Brian,  any update on the etching projects? I understand you are tremendously busy but I have been checking this post pretty much every day for the last 3 months out of excitement and anticipation 
I'm sure there are many like me who are hanging for any news,  even if is just a teaser.
Cheers
David.

Thanks for the advice.  Datasheet states 20ms increase and 30ms decrease time.  I'll retest light resistance too.  Oh,  and I think I'll order some vactrols.  I was hoping to avoid the expense,  but I may need to in order to get an accurate effect.

Could anyone help advise me how to properly measure photocell resistance to make my ldrs for nautilus and the like?  I bought some GL5549 photocell (100K-10M) and when I test dark resistance it varies wildly. Often the dark resistance will go off the scale even when my multimeter is set to 200M. Are these photocells ok for Nautilus?

Thanks,  musikding don't have any,  so it looks like banzai! Cheers

Neither have them. Obviously i can purchase from OS, but i was hoping for some suggestions from experienced buyers.

I've done a basic search to see where to buy  Mn3205, 3005 & v3205. Apart from eBay (dodgy) and retroamplis,  where else is reliable and reasonably priced. I'm in  Australia. I assume from madbean's project the are no other ic's suitable for this build?
Thanks.