- Jul 2, 2017
Yes Dan's AKA Poctop's bodies are the best I know of. The Phaedrus Audio tube solutions are excellent IMO and their customer service is quite good.
I have used the Phaedrus solution in multiple builds and I am quite happy with the result. The EF800 is IMO the best actual vacuum tube alternative to the VF14K. The EF800 does require filament voltage and obviously is a totally different socket. One nice thing about the Phaedrus approach is that if you ever stumble across an actual usable (now unobtainium) VF14K you can just pop it in the mic.
The phaedrus is not the only FET based solution on the market for VF14 replacement. Andreas Grosser makes one but at last inquiry would not sell it unless you let him install it in the mic. Their are also Tube solutions by Telefunken, and Saturn sound are made I only mention them as they are there IMO these are not the answer.
Two notes that I noticed in your build photos. In your PSU the resistors you are using in the filter circuit are they the right wattage they look rather small to me. They get very warm. I myself use wire wound types in this area and use a case that acts as a heat sink. The drop down resistor that gives the filament voltage gets warm and needs to be properly installed so that its heat is dissipated into the mic body. The Phaedrus VF14M does not like excessive heat. I built a copy that is overstuffed with vintage parts and had to move the drop down resistor into the PSU as I could no longer get the heat to a low enough level to not cause problems. My website has some info in the blog section
Accopean power supplies makes a regulated UL listed PSU that I use and it works great. Yes I know part of the sound is down to the unregulated nature of the supply but I opted for safety and consistent voltage and I have not noticed a truly tangible sonic difference. If anything IMO the regulated supply makes for a bit more presence in the sound.
Conserve space with mini-modules as small as 2.3" x 1.8" x 1.0". Models with outputs ranging from 1 to 75 volts, and from 30 mA to 2.5 amps are available. All feature excellent regulation and ripple parameters, and are short circuit protected.www.acopian.com
Glad to hear more praise of the Phaedrus tube!
Yeah, I'll be using 5w resistors. If you're referring to the 4th picture down, that just an example of what I was thinking for how I might build the PCB.
Good to know about the heat issue. Dan uses these 10w HS10 style heat-sinked resistors in his builds and my mic body even comes with a block pre-drilled and tapped for one. The issue I'm having is that I can only find a 1.5k. In fact, I've noticed Dan has a 1.5k in his examples. No idea how he's making that work or what tube he's even using. I may need to just email him and ask.
Oh man. That regulated PSU is really tempting. I like the idea of building my own, but I also like the idea of a regulated and consistent power supply. Which model did you purchase? Since it's regulated, I'm assuming I don't have to worry about the volage spec changing under load, so 105v?