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- Users: dsavitsk
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"Millett Hybrid" redux: NuHybrid headphone amp, using the Korg Nutube
Hfe on those is max 300. At the 10mA running through these, the base current will likely drag the voltage too much. A darlington (2N6426 perhaps?) might work.- dsavitsk
- Post #37
- Forum: DIY (Do-It-Yourself) Discussions
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Millett "Starving Student" hybrid amp
Could they? Sure. Should they? Probably not. You have neither sufficient voltage nor current in the SS application, the heater's need a lot of current and are too low voltage, the mu is too high, and they are tricky to work with.- dsavitsk
- Post #7,044
- Forum: DIY (Do-It-Yourself) Discussions
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A very simple single-ended parafeed design
Nice design :) I am a little concerned about the unbypassed cathode resistor - you are adding ~2500 Ohms to the plate resistance with it, which sort of defeats the point of the low Z tube. I have a write up of such designs which might prove useful...- dsavitsk
- Post #12
- Forum: DIY (Do-It-Yourself) Discussions
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ECP Audio - DSHA-1, L-2, Black Diamond
Here is a quick rundown of what is upcoming ... DSHA2 is a small, direct coupled, transformer gain amplifier for use with balanced headphones. DSHA3 is kind of the default amp, meaning that if you ask me which one I recommend, this is usually the answer. It uses transformers for gain, and it...- dsavitsk
- Post #250
- Forum: High-end Audio Forum
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What's the best amp for HD800
There is an ecp thread? I didn't even know. Do you have a link? I'm not trying to ignore anyone, I just haven't seen it. I am a fan of the headphone power amp concept - basically, for people with a DAC that has a volume control, or for people who are going to just drop the amp into a rack...- dsavitsk
- Post #400
- Forum: High-end Audio Forum
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Torpedo III Build Thread
There was a time when single ended amps were only used because they was cheaper to build and good enough for low end equipment.- dsavitsk
- Post #226
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
Push-pull is a large catchall that is not very descriptive. Yes, it is push-pull, but this does not mean that it is very closely related to many other designs that can also be described as push-pull. It is a differential circuit, which is a better description here. The output impedance is very...- dsavitsk
- Post #224
- Forum: DIY (Do-It-Yourself) Discussions
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Official New York Spring Meet Saturday June 11 2016
I may make it if Todd picks me up on the way.- dsavitsk
- Post #65
- Forum: Local / Regional Head-Fi Meets, Parties, Get-Togethers
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Diy phono valve pre-amp
A phono stage is probably the most difficult audio component to build. A tube phono stage is the most difficult variant. Here's one I built a while back, though there is not much more there than a schematic. Bottlehead makes several fine kits if that is more up your alley. Otherwise, pick up...- dsavitsk
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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Tube Amp Noise
You mean grid stopper. Unlikely the issue unless it has always been there.- dsavitsk
- Post #9
- Forum: DIY (Do-It-Yourself) Discussions
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Tube Amp Noise
That sort of noise is consistent with something oscillating. If it just started recently and happens regardless of the tubes used, that suggests that a part has gone bad -- likely a capacitor somewhere.- dsavitsk
- Post #4
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
If the amp is running as expected, they have around 150V across them. At startup, or if the tube is not conducting for some reason, they'll have 225V. And if the regulator fails, they could see close to 300V or so. If one fails, you still have the transformer between you and the high voltage...- dsavitsk
- Post #205
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
Plastic is good. I think you'll be surprised at how good the box caps are. But if you aren't, the best option is likely a small (0.1u?) bypass across the top of the box cap. Otherwise, you might look for 4.7u/300V caps that will fit and use 8 of them.- dsavitsk
- Post #196
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
Do those have metal bodies? Nope.- dsavitsk
- Post #194
- Forum: DIY (Do-It-Yourself) Discussions
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Iron transformer standoffs / platform / risers
If you are investing this much effort, upgrade to the equivalent 300 series. You can remove the endbells and replace them with brackets. https://www.edcorusa.com/brackets- dsavitsk
- Post #5
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
2006? You guys are a bunch of neophytes. As for the transformer - It would certainly not be the first noisy Edcor we've seen, but checking for DC offset is a good idea as a first step as replacing these is not trivial. The buzzing is mechanical? That should not translate into harsh sound. Are...- dsavitsk
- Post #181
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
R3, D3, D4, and D5 form a voltage divider. D3-D5 will always drop a fixed (~225) voltage as they are Zener diodes, and that's what Zeners do. R3 drops the remaining voltage and limits the amount of current flowing through the diodes. That 225V biases the gate of Q1, and the source stays at a...- dsavitsk
- Post #156
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
The safety ground wire should be soldered to the via right next to the power inlet that is labeled "SG" and then connected to the case. There is a large hole in the PCB through which you can insert a socket wrench or a screw driver to tighten it. Please note that you must scrape away some of...- dsavitsk
- Post #147
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
The pot grounding wire should be soldered to the small pcb via right next to the pot. It is in the space between the pot, the output transformer, and the edge of the board. It is labeled "PG" for "Pot Ground."- dsavitsk
- Post #146
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
I think it is too high, so I would not use them.- dsavitsk
- Post #144
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
Pick up a thermometer to be sure that you are not overcooking the caps. Tubes can run quite hot. And wrap the leads in teflon if you didn't already.- dsavitsk
- Post #132
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
Now available: https://squareup.com/market/ecp-consolidated-productions-llc/headphone-amplifier-parafeed-transformers-pair- dsavitsk
- Post #113
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
I believe Tom will be offering pre-build T3's once he has time to build some.- dsavitsk
- Post #111
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
I will have the individual transformers for sale on my site. I just need to actually put them there. Give me a day.- dsavitsk
- Post #95
- Forum: DIY (Do-It-Yourself) Discussions
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Torpedo III Build Thread
I've got plenty more. No worries -- I'll drop them in the mail to Tom on Monday morning :)- dsavitsk
- Post #90
- Forum: DIY (Do-It-Yourself) Discussions