PT2399 delay time

[LaceSensor]

Hi everyone

Long time no see.
I recently picked up an old SnazzyFX  Wow&Flutter.
Its a broken tape deck simulator which basically has an envelope control over the delay time - its super rad.

The question I have is.... which component(s) around a PT2399 set the max delay time ? Is it as simple as the actual delay potentiometer resistance?
This pedal has a B50k for the delay time control and the max delay feels about 300ms. Figured you could get double that or more out of a PT2399?

Looking at an archetype like the Rebote and Deep blue, they are also B50k.... so its probably something else.

Any comments appreciated (!)

[matmosphere]

I've never taken a deep dive into it, but I do recall seeing this a while back:

https://www.electrosmash.com/pt2399-analysis

Best of luck!

[Govmnt_Lacky]

Looking at the datasheet, it lists the resistor in series with the delay pot at Pin 6. Mind you that the datasheet says "External Resistor having a value of 10K to 50K ohms may be used. On the datasheet they list a 20K pot with the "External Resistor" so I do not know if you have to account for the pot's max value along with the external resistor.
Mind you that the higher you go, the higher the THD goes too. 

[LaceSensor]

cheers

[matmosphere]

Just remembered about the mod taggboard added to the depeofundis

https://tagboardeffects.blogspot.com/2014/04/grind-customs-fx-deprofundis-delay.html?m=1

Worked pretty well for me

[LaceSensor]

thanks again. maybe ill try some mods!

[culturejam]

50K should give a LOT of delay time (like at least 600ms). Are you sure there's not a resistor in parallel with that pot to knock it down a bit?

The other component that sets the time is the resistor on the same pin as the delay pot. Don't go below 2K2 as the PT might "lock up" on startup.