After having had lotsa fun with the Polivoks VCF build, what the MB6582 really still misses is a “vintage” analog delay (moar saturation with increased delay times, “deluxe memory man” style), so I´ve looked into some diy analog delay projects…
Using the retro MN3005 bucket brigade chip would be my first choice (i know, there are modern alternatives, but the real thing with 15V headroom would be nice! ;-))
Now, there are some chinese sellers on ebay, but… you know…
Questions:
a) does any MIDIboxer have some leftover stock from an analog delay build (i´d need four pieces)?
b) any recommendations on “reliable” ebay or shop sources, that have these in stock?
Will keep looking for a while, neither the listed shoppe or utsource haz them (asked for a quote), if all fails, will prolly fallback to the “Coolaudio” 3005 clone, that has less headroom, but should work somehow!
The Dirtbag Deluxe (here is the DIY build link: http://www.madbeanpe…rtBagDeluxe.pdf ) is an EHX Deluxe Memory Man clone, an analog delay, based on those old “bucket brigade” delay chips from Panasonic… all “retro analogs” are quite lo-fi, because the high frequencies will degrade the longer the delay time (gives this dark “pink floyd” character), many digital delays emulate that (and I think the rebote does this too with some analog filtering)… I already have a digital “jomox t-resonator” delay+filter, which can do other wild things, so I wanted to build a pure analog one, when there is time… but I have to agree, the Rebote 2.5 sounds really very close to those analog ones, i like it a lot!
Research note, to anyone interested in these delays
As for now, you can still get MN3008 bucket brigade delay chips with half the delay time as the MN3005s from trustworthy sources like smallbear electronics (jojjelito´s recommended link, thx again!). These can be converted into “full” 4096-stage “bucket brigades” by chaining two of these chips - the corresponding circuit is also published on that site.
The other alternative are v3205 chips, which are new pseudo-clones by coolaudio and are available for about 1/3 of the price of two 2048-stage BBDs. But the v3205s are driven by 9V only, have less headroom - and in some delay designs seem to have problems with distorted delays.
Here is a nice “old vs new bucket brigade delay” demo:
As a conclusion, the cost for a “real” -15v analog DIY delay today is less than 100$, which I think is still great for its sound.
The price will probably rise in the future, as the MN3008s may become quite rare, too…
