DIY reverb without springs

bugbrand · Posted: Tue Jan 03, 2006 3:06 pm Post subject:

&, oh yeah - on the subject of the Rebote Delay --> thats using the PT2399 chip (one of the cheapest digi delay chips I think?) which I've used for VCDelay for my modular whatnots.. Aiming to write up details of that somepoint soon.. I quite like it for delay (especially clocking it waaaaay down - you can get a noisy 4+seconds delay out of it if you push it!), but don't reckon it's too hot for reverbs. . . . . But, then again, I'm not too keen on synthesised reverbs other than for wierdy effects (and then I would probably go for springs)

Scott Stites · Posted: Wed Jan 04, 2006 8:45 pm Post subject:

Bugbrand,

If your into the PT239X devices, check out Ryan Williams' page:

http://www.sdiy.org/destrukto/vc-echo.html#pt2396

I got heavy into the PT2399 back in '02 - I had a crazy circuit with two PT2399's cross-regenerating, with both under voltage control. It was a blast. Actually I could run them in parallel or series. In series, you can get some pretty clean long delays.

You can clean up the long delays somewhat with a compandor, depending on how long you want them.

High regen controlled by S&H is a *great* effect, BTW.

Cheers,
Scott

bugbrand · Posted: Thu Jan 05, 2006 2:53 am Post subject:

Cheers Scott! - yeah, haven't had a 2395 ('cos of availability and the external RAM) - shame the delay time setting on the 2395 is totally different to the 2399 'cos my circuitry is still a little bit shakey and I could do with more pointers!

I love the dirtied quality, but I do have a tube of SA571 compandors that I've never gotten round to using, so.....

Scott Stites · Posted: Fri Jan 06, 2006 3:49 pm Post subject:

revtor · Joined: Oct 05, 2005 Posts: 79 Location: NewJersey, USA

hey guys... great forum here!

I believe the oilcan delays used a rotating aluminum disk, with two brushes contacting it it to induce a charge and then read it back. The disk was oxidized so the minute oixde particles would act as tiny caps.. The oil was used to help keep the charge on the plate, until it spun aroud to the pickup head..
iirc : )

I had one years ago, never got it working 100, I think I tossed it : ( oh well ....

cheers
~Steve

mosc · Posted: Mon Feb 27, 2006 9:47 am Post subject:

Here's a good old topic about DIY plate reverbs.
http://electro-music.com/forum/topic-80.html