Using Nixie tube DC high voltage power supply for tube based pedal builds?

[Rob Strand]

Transmogrifox indeed made a good effort to make a very nice circuit. I removed some stuff to size it to be "stompbox-friendly", so the performance dropped a lot for higher loads. But since a stompbox usually uses a tube or two, the smps can handle it pretty well.

You have to do what you have to do.   

The DCM design I played with looks very similar to yours except I removed C7 on your schematic.   I'm running at 100kHz and I didn't investigate what changes need to be made if I dropped down to 50kHz.   The devil is in the details with these things (I'm reluctant to post it since I haven't built it and I haven't spent a long time checking it.)

ESR is something local sellers doesn't know a thing. Even online is kinda hard to find low ESR caps. So I had to use a regular cap. Also, my cap bank is way smaller than Transmogrifox's for the "stompbox-friendly" reasons, so the ripple is even bigger.

There is limitted ESR info on those small high voltage caps.   The ESR at 50kHz or 100kHz tends to be a bit lower than the 120Hz specs in the datasheet.

Not knowing the ESR is a problem for smps.  It can be more of a problem on CCM designs like Transmogrifoxes.    The "current mode" chips do help here.   What you can't get around with high ESR caps is the ripple and also the risk of the cap failing early because it heats up.   At light loads it's probably not an issue but as you start pushing the output power the cap suffers more.

[goldstache]

I made an EP 2 preamp some years back. I ran 1 6eu7 as the preamp stage split loaded. Plate feed to mix pot. Cathode feed to a jack out. That jack out becomes a loop send to your favorite 100% delay. The output of the delay comes back into the second half of the eu7 and on to the mix pot.

In essence, an ep 2 just add your favorite delay pedal or delay circuit. As Ling as the delay circuit/pedal you use with it doesn't flip phase of incoming audio it's great. Should you use other circuits that flip phase, simebinverting buffer circuit in the delay feed solves that.

It's nice, kinda insta echoplex.
Was calling it the "battle plan".

-Joe