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DCR at pins 4-5 should be around 2.4kΩ, if you're reading more than that then it could indicate damage to the transformer. An open primary would certainly result in a very low/thin XLR output. I'm all out of transformers at the moment but I'm expecting to get a bunch more in about 2 weeks, I...

I held off on the order to get another design in with it, expected delivery date for the boards is tomorrow, I will certainly find out and report back.

Not yet, I should probably get going on that.

I'm curious enough to try a couple of the Haufes out, so I asked them if I could make a small batch order for evaluation. I'll let everyone know if it works out and I can make a handful available for those that are also curious.

So apparently Haufe was just waiting for some hack masquerading as a company to shoot them an email. They sent me a datasheet this morning. My suspicion was correct, the ST-8161 is basically a D.I. transformer, which if you run it "backwards" becomes a mic input transformer. The frequency...

This is going to sound unorthodox, but I've always enjoyed using a Klon to boost a Rat.

Very well could be. Hopefully someone in such a position will come along and pose such a question to Haufe a few minutes ago.

The oscillation issue is only an issue with the gain high, so lower gain tubes would definitely help. 12AU7 probably wouldn't sound great though. The buffer footswitch takes care of it though, and you should be able to run it with 12AX7 with no oscillation if you're using the buffer footswitch.

Fair enough, so I guess the next question is how much would they charge for 100 units, and would they then include the datasheet if you were to purchase them?

Looks like it's essentially a D.I. transformer. THAT1512 is a mic preamp IC so it needs a balanced input, which the 1/4" isn't. The XLR jack is already balanced, but because they wanted the XLR and 1/4" to share the -20dB pad (and as you speculated possibly for some tonal characteristics) they...

I like 3PDT PCBs as an opportunity to reduce offboard wiring and solder them straight to headers on the main PCB. Sure it's more solder connections, but it's less wire used and saves time overall. Even without header pins though, they help to keep the innards tidy and despite being more solder...

Yeah I get that people like testing things to be sure, but if I didn't trust the manufacturer to print the write value on the resistor, I just wouldn't buy from that manufacturer. Checking one or two here and there is fine, but if I had to test every single resistor I used I would be up all...

There are a couple pictures in this thread and suspicions that the "Ska" is based on an Electra, but nothing conclusive.

Two-channel Dumble ODS preamp. Hopefully this one is cool.

I may have been looking at something else and/or typing with my eyes closed, apologies for the confusion. 0.25mm is a good start, but if you're doing something on the higher end of the gain things you'll definitely want more than that.

The Unagi should hopefully be back in early April. I thought I had plenty on hand to last until then, but Sushi Box production shares transformer stock with C2CE, and with a new run of Neptunium the transformers quickly started disappearing. The last few orders only took 6 weeks to build, but...

General note: if you're going to be doing a ground fill, don't bother drawing ground traces. It takes up space that could be used for other signals and can cause unnecessary vias and sloppy routing to go around things that aren't going to be there permanently. When I'm doing 2-layer boards with...

270Ω + 470Ω gets you to 740Ω In that spot in the circuit the value isn't super critical though, anything in the ballpark should be fine though, either 680Ω or 820Ω should work without issue.

Back when I was auditioning transformers the only place I was able to find them was direct from Jensen, and I had to reach out to a sales rep and get a quote and stuff. Aliexpress seems to have a knockoff JT-DB-EPC for $17, I'll have to grab one to try out.

I put mats on my benches at home, but I almost never strap in. I'm in a humid enough place and the stuff I work with isn't super sensitive, but the mats are nice to work on and easy to clean, and I like having the option of strapping in if I ever feel like it's necessary.