Analog Delay - Modifying the AD-3208 BBD Stages

[thermionix]

This concept was inspired by the Maxon AD-999 and if anyone can source a schematic for that or better - the pro version please send it my way!!

Sorry for my ignorance, but is there an Ibanez equivalent to the AD-999?  Here's a schematic for an AD-99, don't know if it's the same thing:

http://bmamps.com/Schematics/Ibanez/Ibanez_AD-99_Analog_Delay_Schematic.pdf

[Kevin Mitchell]

Other than a few design differences (very minor differences I'm sure) the AD-99 uses one mn3205 (4096 stage BBD) while the AD-999 uses 8 mn3207 (1024 stage BBD) effectively doubling the delay time - theoretically of course. It says the AD-999 can do close to 900ms of delay but I have trouble believing that given the ratings of the mn3207 chips.

[thermionix]

The extra "9" gives additional delay time, that should have been obvious.

[armdnrdy]

The extra "9" gives additional delay time, that should have been obvious.

Not necessarily so.

The AD-9 uses 4096 stages with 1-MN3205
The AD-90 uses 8192 stages with 2-MN3005s or 4-MN3008s
The AD-99 uses 4096 stages with 1-MN3205
and the AD-999 uses 8192 stages with 8-1024 stage MN3207s

So...adding or subtracting a "9" doesn't get you more or less delay.