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This look OK? Also, how 'bout draining those pesky caps on shut down?? BTW, looking fwd to the DIY AB763 coming our way!!!!!!!!!!

I can mount the tube on a standoff and stick a "master ground" there or underneath one of the jacks. But no GRD run transits thru another component to get to ground. They may share a common wire, but all converge on pin 3 of V pot which I can run to the "master ground". But this is exactly...

This is something @vigilante398 and I have discussed offline. It is a layout for a Fender blackface preamp. I would appreciate any feedback. It will be built off of Sushi's HV-PSU. I think I have the basic circuit routing, etc., but I'm particularly concerned about having the unit grounded...

JJECC83S tube. Pics attached. I scrubbed everything down with alcohol when done. I was using an exacto knife to be sure there wasn't any "spill over" on the solder joint adjacent to the bottom terminal of the IRF740. It scratched the brown surface of the PCB and it appears that there is...

Got things rectified (amplifier joke??) with the IRF740 and when the GAIN is turned up a little over half way I get a "warble" (sounds like R2D2 from Star Wars) followed by a high pitched screeching the rest of the way up. Its roughly a high frequency multiple of 60 hz cause it is enharmonic...

You mean the line that's on the opposite side of where I have it installed????? 😫

Just finishing wiring up my SH. Is there a proper orientation required for the IRF740? I don't see any indication on the PCB.

Is Space Heater designed to yield a FLAT response curve so it renders a "faithful" signal of what's coming into it?

Gotcha, thx! I believe you said that 22 or 24 gauge hookup wire is sufficient for wiring up your pedals. . . please confirm? BTW, that Echo Foxtrot looks mighty tempting (I call her Voxy Lady ;)).

I've seen references to the Space Heater "buffer board". Nathan has mentioned that he hasn't had issues with impedance or signal levels coming of his pedals into downstream devices. What does this refer to?

I got your High Voltage PSU and have a couple of questions: 1. Heater leg is 6.3vdc, therefore (+) to pins 4&5 and (-) to 9? 2. You have two 9vdc & Grd eyelets side by side. Is one to provide a 9vdc leg to operate LED's? 3. As far as ON and OFF is concerned would you effect that simply by...

Helps if you speak German.

I was thinking about buying an MXL770 in order to pull the circuit board to understand the physical constraints or requirements for PCB design. I found this schematic on the web. Any of it make sense?

Vig - Every few months I try to pull my head out of my arse and look around to see what's going on. I did this morning and just realized that you have your own dedicated thread. . . go figger!!! I'll monitor the progress on my blackface Fender preamp here. But having a place to be informed...

I notice we've got a headphone amp PCB. How 'bout circuit upgrades for condenser mic's? Microphone Parts (among others) sells diy PCB upgrades for inexpensive mics like MXL, etc., but they're pretty pricey as they supply the electronic components as well as the PCB. Anybody aware of a source...

That bad, huh?

The PA2 schematic calls for 4/ea - 49.9K resistors & 1/ea 499K resistor. I see that those values exist, but Tayda doesn't carry 'em. Will the world end if they are 50K and 500K respectively????

I'd be interested as to what else might be out there.

Maybe the question I should be asking is whether or not the piezo requires an on-board preamp. Is there enough signal strength to run a "naked" piezo pup thru a standard guitar cable to a pedalboard mounted preamp? Anybody have any info on the output levels of piezo undersaddle pups?

I found this on the internet: This pcb layout appears to be to scale and designed around 1/4 watt resistors, etc (forgive the ghost images to either side). In talking to some of the experienced members of the forum I'm surprised as to how cheaply PCB's can be made in small qty if you know the...