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  1. Sodacose

    Millett "Starving Student" hybrid amp

    If you want to get fancy, the ohmite pins are mounted in a 2.3mm channel. You can easily thread this for a 3mm or 4-40 mounting bolt.
  2. Sodacose

    DIY tube amp for planar headphones

    You can find a write up here: https://wtfamps.wordpress.com/el-bad-hombre-headphone-amplifier/
  3. Sodacose

    New DIY Altoids Tin Amp - The Pocket Class A "Wintergreen Handwarmer" by xrk971

    Weird, I don't know what happened with the link but I just fixed it. Might have been an edit that screwed with the address or something.
  4. Sodacose

    Modern Balanced Tube Amp Build

    I wouldn't hesitate to try any of Rod Coleman's designs. You'll need a gyrator for each channel. The "In" is the "positive" of an RCA and the "negative" should be grounded. I haven't seen how Rod built this amp, but I'm certain that all the grounds are tied together in some way. There are lots...
  5. Sodacose

    New DIY Altoids Tin Amp - The Pocket Class A "Wintergreen Handwarmer" by xrk971

    My pleasure, seriously. It is really interesting to compare the two amps: lots in common between them. I'd say 'great minds think alike' but I'm not so sure about my own :beerchug:
  6. Sodacose

    New DIY Altoids Tin Amp - The Pocket Class A "Wintergreen Handwarmer" by xrk971

    Pic of my build with stock values! And here's a guest post review I wrote up after building this amp: https://audioprimate.blog/2017/07/18/pocket-class-a-diy-headphone-amp-by-xrk971/ All-in-all, it's a great amplifier! Sound is excellent and it pairs really well with what I assume to be the...
  7. Sodacose

    Modern Balanced Tube Amp Build

    Coinmaster, do you have a build/design posted somewhere that I can read about? Out of respect for OP and MrCurwen, we should try to avoid hijacking this thread with discussion of other designs/philosophies.
  8. Sodacose

    Modern Balanced Tube Amp Build

    Very provocative thoughts on the 'weak' buffer driving the cheap OPT :) I was wondering the same thing as coinmaster, but you make a good point. Proof is in the listening, I think. Have you tried any similar experiments allowing the MOSFETs to provide a fixed bias to the output tubes rather...
  9. Sodacose

    Modern Balanced Tube Amp Build

    Thanks for the lengthy responses! All good info. I'd encourage you to revisit the Super Triode topology when you get bored because I'd love to see what you come up with. I don't believe there is any reason they can't be used OTL, differential, or parafeed. With the lowered effective Rp and...
  10. Sodacose

    Modern Balanced Tube Amp Build

    Hi MrCurwen, Thanks for your thoughts. I've also been reading up on TubeLab's A2 experiments and have seen Millett's similar CCS loaded mosfet implementation. Even if not driving the grids to A2, it sounds like your arrangement serves a similar purpose here: dealing with the impedance...
  11. Sodacose

    Tube Amp Component ID and upgrade help?

    I think the Nichicon FG series only goes up to 100V, at least I've only ever used them as cathode bypass for tubes or in SS circuits. Beyond that I use one of their standard series or whatever is cheap from a reliable brand when needed. I bought a bunch of Nichicon GN series snap-in 120u 500V...
  12. Sodacose

    The "Are You Serious" Thread

    That Jolida looks like an SRPP rather than a cascode. Little bit better of a choice as an output driver but still pretty basic. I've heard this preamp a couple of times. It isn't bad but not all that inspiring either. Why they use opamp gain and RIAA stages followed by a tube SRPP output is a...
  13. Sodacose

    Modern Balanced Tube Amp Build

    Wew, nice build! Do you know what the reasoning for the grid drivers is? Are they driven A2 or just there to buffer the previous stage? Very interesting design with the mosfet sandwich and transformer coupled output.
  14. Sodacose

    Tube Amp Component ID and upgrade help?

    Got a schematic of the amp? I don't mind orange drop caps for audio and use them regularly where it makes sense. I even use them for interstage coupling and haven't ever felt like they are a bottleneck. For the 3.3uF, I like the Cornell Dubilier 940C series, but I think they are rated at...
  15. Sodacose

    "Millett Hybrid" redux: NuHybrid headphone amp, using the Korg Nutube

    Killer, thanks for the insight.  I'll be watching for the audioXpress article!
  16. Sodacose

    "Millett Hybrid" redux: NuHybrid headphone amp, using the Korg Nutube

    Hi Pete (if you're still here). Can you talk at all about why you decided to use the Nutube as a voltage gain device? It's an interesting "tube" with some challenges to overcome, so I'm just curious about the overall design goal and how the NuTube fit into it. Seems it has some size/efficiency...
  17. Sodacose

    "Millett Hybrid" redux: NuHybrid headphone amp, using the Korg Nutube

    Thanks for the clarification and reading, tomb. I was referring to the original Starving Student design as found on Pete's website: http://www.pmillett.com/starving.htm
  18. Sodacose

    "Millett Hybrid" redux: NuHybrid headphone amp, using the Korg Nutube

    I bet the lower pot value was a parts availability choice. Hard to find dual gang audio taper in 50k-100k values from digikey/mouser. At guitar parts values (250k+) then you do usually have to start taking into account what it is feeding.
  19. Sodacose

    "Millett Hybrid" redux: NuHybrid headphone amp, using the Korg Nutube

    Maybe Pete will comment, but I don't think there would be major input capacitance with the buffer that follows it to create a hf roll off.
  20. Sodacose

    "Millett Hybrid" redux: NuHybrid headphone amp, using the Korg Nutube

    If you wire it off board, I don't see any reason that a Blue Velvet wouldn't work.
  21. Sodacose

    "Millett Hybrid" redux: NuHybrid headphone amp, using the Korg Nutube

    Haha, aw man.  I just finished a hybrid inspired by your original:   http://www.head-fi.org/t/838886/my-take-on-the-starving-student-el-estudiante   Now I've got to build another?     Thanks for sharing, Pete!
  22. Sodacose

    Millett "Starving Student" hybrid amp

    Here's a Starving Student variation that I finished recently:     It's a different tube, but same basic overall topology (tube voltage gain feeding MOSFET source follower) and same power supply. The tube is resistor loaded single-ended and it's direct coupled to the MOSFET, which is CCS...
  23. Sodacose

    My take on the Starving Student (El Estudiante)

    Thanks for your kind words, 100volttube. Truth is there's very little short of space charge tubes that is going to be linear at 48v B+. From just looking at plate curves though, the 5687 does much better than most. Well enough that a 3x Rp load will let the grid bias negative with a couple ma...
  24. Sodacose

    My take on the Starving Student (El Estudiante)

        The Starving Student was the first tube amp I ever wired point to point. Unfortunately those 19J6s are getting hard to find. Here's another spin on the same 48V tube+MOSFET buffer theme using a 7370 tube (5687 with 40V heaters). As tribute to Pete Millett, I'm calling it El Estudiante...
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