Millenium Problem - Slow LEDs

[ClenchedTeeth]

Sorry if this has been posted elsewhere, I am sure I have heard of this problem before but I couldn't find any mention of it.
I just mad a dual SHO/2in1 clone and used two millenium 2 circuits for the LEDs. It works as it should, except the LEDs turn on far too slowly (fades in over say 5 seconds), and the behaviour is exactly the same on both channels. I have checked the wiring/layout and parts orientation and everything. I've built the circuit many times before using the same veroboard layout and never had a problem. I'm using 2n7000 and a 2n3904 for the low leakage diode. I presume the 100k output resistance on the effect is enough to work with the millenium?
As I say, I'm sure I've heard of this problem before so if anyone wants to just link to an explanation elsewhere that would be a great place for me to start.

[R.G.]

The high leakage diode (1N914 or 1N4148) is not quite leaky enough. Put another one or two of them in parallel.

[ClenchedTeeth]

Thanks! Will try that tonight. Seems strange though since they are from the same batch as all the others that I have made, and I happen get two of them at once. Will report back.

[ClenchedTeeth]

Well, I came home and fired it up and the problem had disappeared. The LEDs are still a little slow to turn on, but certainly fast enough to be usable. This might be because I used a fresh battery however. I will report back if the problem pops up again.