Messages

I used the GRs in my prototype. These specifically:

https://www.mouser.com/ProductDetail/757-2SK209GRTE85LF

Thanks!

[2SK209 IDSS classification:]

Wanted a preamp at the end of my chain that could both go the the amp and PA, so I whipped up this pre/DI box based on the Roland JC-120 clean channel and combine it with an active DI.

Hi storyboardist, I'm putting together a parts buy and wanted to possibly include the Paladin (if I can find the parts). For the 2SK209/2SK117, which Idss bin does the build require? I don't see it in the build doc, but maybe I missed it.

2SK209 IDSS classification:

• Y: 1.2-3.0 mA
• GR: 2.6-6.5 mA
• BL: 6.0-14 mA

Thanks!

Hi guys,

I recently built a RoughCut Optical Compressor, VFE Bumblebee Swell-Compressor, & a VFE White Horse Optical Compressor. The first two work great, but I'm struggling to get the White Horse to get it's squish on. Even with the Sustain knob cranked, I get only subtle compression. I also can only get the blue LED to illuminate with the VFE switching board 20k trimpot at it's highest setting, and even then it's quite faint.

I've tried a few different colors/types of LEDs. My blue LED is not the exact one listed on the built doc, but has a Vf in with the same specs. Red/yellow/green LEDs illuminate well at lower trimpot settings & are much brighter. Changing the type of LED and/or the trimpot setting doesn't seem to effect the amount of compression.

I went through and confirmed that the resistor & pot values are correct. I am using the photo of the v5.0 board from the build doc.

I took voltage measurements to compare with those from the build doc. I've attached a photo with my voltage readings, taken with the pedal on & the switching board trimpot at MAX:

• V+/V- are OK coming from the switching board & on the quad IC.
• I also took voltage readings of the positive power rail that feeds the LED anode of the NSL-32SR3 vactrol, through 2.2k R8, then A50K response pot, and 2.2k R17, where it feeds the collectors of the 2x 5088s & the cascaded BS170s.
• My test voltages on the White Horse's 2N5088s & the first BS170 are lower than those listed on the build doc (4.73V vs 7.28V on the build doc). Keep in mind, they are listed for the v4.2 PCB, whereas my board is v5.0.
• The gate of the last BS170 (which feeds the LED anode) is a bit lower (2.34V vs 2.53V on the build doc), and is right in the middle of the forward voltage range listed for the LED.

I've kinda run out of ideas, so any help would be greatly appreciated! If anyone has answers to these questions, that would great as well:

• I soldered in the BS170 & 2N5088 transistors, should I go back and socket them to see if that helps?
• Does anyone have voltages for the v5.0 board, or are they the same as v4.2?
• What should the knob/trim pot positions be when taking voltage readings?

Hey Blue,

Did you ever end up doing this? How did it work out?