Recent content by mrhk13
  1. mrhk13

    the CTH (Compact Tube Hybrid) Rev A thread...

    Hm, that all makes sense, especially since I ended up using a 10k pot - couldn't find the 50k one. I'll see what I have left in terms of resistors - or get a few at 200 or so. And when next I feel brave enough to take the whole thing apart again... Thanks Mullet!
  2. mrhk13

    the CTH (Compact Tube Hybrid) Rev A thread...

    Quick question for Mullet on gain of the CTH. I'm using Sony MDR-SA3000 headphones, 70 Ohm impedance, sensitivity of 100 dB/mW. I find that with the 12AU7 tubes I barely make it to 9 o'clock on the volume; with the 6-series I can just about do 8 o'clock. Based on your last post, should I...
  3. mrhk13

    the CTH (Compact Tube Hybrid) Rev A thread...

    Here are some pics of my stock CTH. Front shows on/off switch, voltage switch. And yes, I did do a fuse and on/off switch: I'm not yet that confident in my soldering skills! I'm annoyed I mis-measured the hole for the power plug. I still need to drill holes in the top plate, mostly trying to...
  4. mrhk13

    the CTH (Compact Tube Hybrid) Rev A thread...

    Another satisfied customer! I finished the build (finally!) last night and had nice sound from the left, and a loud hum from the right. Turns out my wire at IR had broken during boxing it up. D'oh! Fixed that earlier today and now there's sweet music. First impressions are that it sounds...
  5. mrhk13

    Switching source between headphone and speaker amplifier

    I'm working on a CTH (yeay!) which is nearing completion. Doesn't mean it'll work, but still, I have high hopes . I would like to be able to switch my source (CD player) signal from the headphone amplifier to the speaker amplifier without having to undo cables. Can I just connect the CD player...
  6. mrhk13

    the CTH (Compact Tube Hybrid) Rev A thread...

    Thanks Mullet... This morning I checked RevA schematics rather than the original schematics on the Cavalli Audio site and d'oh! I feel a bit of an idiot. It makes more sense now. I need to look back at my board: more possible voltages must mean more pads to connect a three-way/four-way switch...
  7. mrhk13

    the CTH (Compact Tube Hybrid) Rev A thread...

    I've finally started my build, so far there's not enough on the board to do any testing, so it must be going great!   As I was looking for various things, I realised I didn't get R5H. I'm probably missing something on the CTH website or in this thread - but what value should it be? I...
  8. mrhk13

    DIY speakers - a question

    I was thinking of doing a make-your-own speakers project with my father-in-law: he's a woodworker, and I'm getting into diy audio. Since he has little interest in high quality stuff and currently has really cr*p speakers, I figured it's a good way of getting my feet wet, bond with him, and not...
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