How set-up Dr Boogey?

[RaceDriver205]

Anyone know what the trimmers are set 2 on Dr Boogie, and indeed why there are any at all?

[gaussmarkov]

dr. boogey has five j201 transistors in it.  Q1-Q4 all have 100K trimmers on their drains.  these are for biasing the transistors.  jfets seem to be notorious for being finicky so folks don't just drop in some standard resistor value.  the nominal target voltage at the drain is 4.5v for a 9v supply, but you should use your ears to adjust this value.  many people report liking higher values.  if you look at the runoffgroove amp emus you will see the same arrangement there.

hope this helps.

[RaceDriver205]

Cheers, i kind of asked before i finished building though. Once i finished building it it sounded like it wasnt working, until i fiddled with the trimmers a bit and... BEST DISTORTION YET! Seriously, none of this low-gain blues overdrive nonsense, and none of the non-existent palm mute sound of AMZ OD etc. Anyone wants the full experience of maxed out valves, then this is the closest approximation youll get.

[gaussmarkov]

cool!  did you happen to measure the voltages?  if so, what are they?

[Bucksears]

PRAISE THE DR. BOOGEY!!!
I'll tell ya, I'll never buy a Metal Zone again.

I have mine set at 4.5v each, regardless of what my power supply reads; the Ibanez AC109 that I use for playing a single pedal (i.e. testing it out) rates at around 8.85v.

- Buck

[scaesic]

is there a layout for this/jcm800 emu?

[Bucksears]

is there a layout for this/jcm800 emu?

Yep.
http://www.4thlevelmedia.com/stompboxes.html

- Buck

[ildar]

the nominal target voltage at the drain is 4.5v for a 9v supply, but you should use your ears to adjust this value.  many people report liking higher values.  if you look at the runoffgroove amp emus you will see the same arrangement there.

I always wondered about setting the fet drain voltages higher (or lower) than 4.5 on the ROG circuits. Is there a "too high" or "too low"?

[RaceDriver205]

yeah, i didnt measure the voltages, n im not sure if ive reached full possible gain, but if you turn the gain knob to max, and then adjust each of the trimmers until you hear its reached max gain, you cant go wrong. (You really can 'hear' the gain)