Hartman Flanger clock noise

[sjaltenb]

Hi!

Just received my Hartman Flanger (mistress clone). I ran it guitar-pedal-amp with a one-spot adaptor to test it out, sounds awesome! So i gutted it and installed it in my multiFX board running at 12V in a bypass loop.

Problem: NOISE. Clock noise I guess...but its not a tick, its more like lasers....swishh swisshh swiishh or something like that. Right now it is sharing a power supply with a Phase90 (the p90 has no noise)

The Hartman has a Bias trimmer (see below)  which I can turn that eliminates the noise, however it also stops flanging. There is a PT-80 a few inches away, but has an entirely seperate transformer and power supply. I think thats the only other clock on the board. (CE2/pt-80/vibe/p90/?)

I have also heard that a JFET buffer in front of the old original EMs can cuase the clock noise to become audible. Well my main input is a JFet buffer that never gets bypassed. Could this be the culprit? I tried placing the enclosure around the pcb with a clip to ground. No effect. It must be interfering another way, not some kind of EMF thing. Its definitely not hum or hiss either.

Any ideas?

http://www.theohartman.com/hartman_flanger_trims.pdf

The bias knob is what erases the clock noise but the flange also. The three other trimpots do not have any effect on the noise. They are just set to 'preference' (except feedback, which is just dialed in enough to keep it from feedback at full Color

[sjaltenb]

I started thinking about it and decided this should be my troubleshoot. Any recommendations are appreciated:

1.1) Unplug the Phase 90 which is currently sharing a power supply with the Flanger.

1) Bypass everything and input guitar directly into the Flanger's bypass switch, output directly to amp to determine if it is the pedal chain or input buffer that has an effect. Work backwards towards input and forwards towards output to find a potential culprit.

2)Rebuild the unit back into its original enclosure (sans the switch, etc. a quick rebuild) and realign all trimpots to work correct in a 'regular environment'. Test the pedal at all settings to understand exactly how it reacts.

3)Insert the assembled pedal into the multiFX, and power the enclosed pedal with the board's power supply to see if that has an effect. Still using the pedals input and output jacks to and from the guitar/amp. Nothing else in chain.

4) Tap the boards bypass system into the assembled pedal (by inserting wires through the switch hole) and see if this has an effect. Now the assembled pedal is essentially part of the multiFX, just still in a boxed enclosure.

I think at this point, if the pedal is working properly, but simply needs to be isolated, I will then just need to buy a blank enclosure and bolt it to the inside of the board, drilling a wire to feed the power, gnd and in/out.

If the problem is somehow coming from power, ground, other pedals, etc, then I will submit my findings and we can go from there.

[tonysamperi]

Hello Guys,

I hope you can read me!

I came across this post a few weeks ago.

I decided to customize the Hartman a little bit so, after marking the default trimpots positions, I made some changes.

After that, my Hartman Flanger started doing that noises, so I had to put the trimpots in their original position.

But...guess what? I discovered those noises are totally normal!!

And this is really astonishing, because it make me think about how much faithful this reproduction is!!!!!

https://youtu.be/fNhFudQ6nRY?t=4m35s

Here you can listen at 4:35 - The link should make the video start from there.

I'm looking forward to hear from you!

Cheers from Italy