Has any one tried the Boss pre-emphasis/de-emphasis with a PT2399 delay circuit?

[Groovenut]

Just curious if there has been anyone who's tried this and what their results were. I'll try and breadboard it soon, but thought it'd make for an interesting thread (or not if no one's tried it yet ).

Thanks!

[Chugs]

Dirk posted something along those lines at the other forum a few years back.

[sergiomr706]

i remember seeing something like this in the other forum, maybe here too

[Fender3D]

I used the MXR flanger's pre-emph/de-emph in my echoverbo...


.. but I didn't test it without...
actually it's dead silent (no true bypass) even if it includes Belton brick too..

[Mark Hammer]

Scott Swartz's PT-80 goes a step further and uses companding.
http://www.generalguitargadgets.com/effects-projects/modulationecho/pt-80-delay/

[pinkjimiphoton]

i built a companded 2399 delay project i found on ebay. not quite the same thing, i didn't like it. it made it noise free, but the delays were kind of anemic... in a weird way. like, they didn't get quieter as they faded away, they just kinda got wimpier and more lofi.

that may be a PLUS, i guess, for some folks

[samhay]

This has been discussed here before and the concensus was the typical high (audio) frequency pre-emphasis/de-emphasis is not likely to be optimal for the PT2399. Instead, it was suggested that a flat (frequency) boost and then cut would give better s/n.
I have implemented this previously with switchable amounts of boost/cut and it does help. Can't say I've done a head-to-head with companding or anything else though.

[anotherjim]

We don't necessarily want delays to be perfect clones. I think most of us like delays to be progressively distorting in some way. And I mean "distorted" in the basic sense of changed somehow. That just might mean duller or thinner.

Compression into the delay is probably worthwhile, however, I'm not sure if expansion of the output is absolutely necessary

[amz-fx]

It is not very useful to use the pre/de-emphasis circuit since the output of the PT2399 is low pass limited by design. With the stock 0.1uF on the demodulator pins, the output signal starts rolling off at 1kHz and is down 10db at 4kHz. The hi-freq noise is already severely attenuated, which is probably why the pre/de is not used much with the PT2399.

Best regards, Jack