[eddie_ruff_]

Hi,

Does anyone have a Valley People Dynamite compressor (19" rack version with silver edges)? I purchased one and noticed some oscillation/noise on both channels. I opened it up, and I'm a bit troubled by the PCB. I see two jumper wires and several cut traces per channel...was this factory?

Pictures are here https://drive.google.com/drive/folders/11wg5FtlcXyYY-atHXNgB7ATeoVIVXWTp?usp=sharing

[eddie_ruff_]

After probing everything out and checking the schematic it appears to in fact be factory modifications. Interesting...

[scott2000]

Old Mytek converters are the same deal ....  Guess they were figuring stuff out......

[Monte McGuire]

Sometimes people get PCBs wrong and don't catch it until they've already manufactured some. Cut traces and jumpers aren't a guarantee of problems, and maybe only an indication that you have an early rev. of the device. Sometimes the early rev's of a device are preferable, since the cost cutting process hasn't yet been applied to the device, which may actually degrade its performance compared to the original design.

Good luck in your troubleshooting!

[eddie_ruff_]

Replaced all the electrolytics with Nichicon caps and upped the PSU filtering to decrease the ripple...just tested on some drums and all appears to be well. Nice n quiet too   

Still need to clean up some scratchy pots and maybe swap out some opamps...

[pvision]

The power transformer on those is tiny. I'm having a real problem finding a 220 volt replacement that will fit in the small cutout in the PCB

I haven't found a source for replacement pots ether - IIRC they have 1/8" shafts

The respond very well to recapping!

Nick Froome

[eddie_ruff_]

Yeah i thought about rebuilding the power area with an AnTek toroidal transformer laying flat. But it is working great as is!

[scott2000]

I haven't found a source for replacement pots ether - IIRC they have 1/8" shafts

There are a few small pots scattered in here... not sure what you're looking for though.....

https://www.eyguitarmusic.com/Potentiometers_c_93.html

[pvision]

I thought of using an external power supply but then then I'd have to fit some kind of latching power connector. The back panel is plastic - and very brittle - so I worry about damage

One of those laptop-style Meanwell 15-0-15 power supplies might be ideal

Nick Froome

[thecr4ne]

The power transformer on those is tiny. I'm having a real problem finding a 220 volt replacement that will fit in the small cutout in the PCB

In the original schematic (available in the manual on valley people's website) the PSU specs a DST-4-36 transformer, which is available from Digi-key, and there are plenty on ebay. It's a PCB mount style, but has split primary for 110/220V. Secondary is 36V center tapped, not sure if other mods would be necessary to accommodate it in the later rev PSU.

[thecr4ne]

...upped the PSU filtering to decrease the ripple...

What value did you replace the filter caps with?

Also,  if you ever open this up again, could you take a pic of how the ribbon cable interfaces with the PSU? I got a unit missing the power supply and am trying to recreate one as best I can. Finding pics of these opened up has been a challenge.
Cheers.

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