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- Users: cfcubed
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Cavalli Compact Tube Hybrid (CTH) Tube & Tweak thread.
Wow, the years go by. Nice arteom…. And hpamdr who’s post from 2015 I just saw 😬, the original breadboard CTH used a pencil tube. I do occasionally pull out a DIY CTH but usually use an Amb γ2 DAC -> Liquid Spark and have for years. Sometimes with a Loki Mini+ in the mix depending. Happy...- cfcubed
- Post #690
- Forum: DIY (Do-It-Yourself) Discussions
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Feedback by 'cfcubed' on listing 'Schiit Saga S'
Good seller. Nice, fast and easy transaction. Saga S came in good shape and works well. Would buy from again for sure. Thanks!- cfcubed
- Feedback
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Comment by 'cfcubed' on listing 'Schiit Saga S'
PM’d. Also curious why it’s rated good; what do you see as any issues. I do see the finish looks odd in the photo; maybe a closer one would be clearer.- cfcubed
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the CTH (Compact Tube Hybrid) Rev A thread...
Thanks for letting me know. Updated a few of the links in my sig. I've built and heard a lot of headphone amps. Part of the reason I stopped building; Too much audio gear & not enough space (or ears:) Though I do plan to someday build out a Bruce Heran 6DJ8 Headwatt I bought the parts for...- cfcubed
- Post #607
- Forum: DIY (Do-It-Yourself) Discussions
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the CTH (Compact Tube Hybrid) Rev A thread...
I still watch this thread. Time flies. Noticed your WTB post, hopefully you'll get a hit. BTW I own both a nice DIY CTH and a Massdrop CTH and rotate both in from time to time. DIY CTH gets play because of its greater tube rolling (voicing) options; I've lots to choose from and find that...- cfcubed
- Post #605
- Forum: DIY (Do-It-Yourself) Discussions
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A Very Compact Hybrid Amp
IG is input ground. You can tag IG wire along with any nearby component's connection to ground (PCB top layer). E.g. R1L resistor's lead/pad right next to IG pad, or nearby R1R lead. You can see their pad connections to PCB top-plane/ground and use ohmmeter to confirm. Note also that IG=SG.- cfcubed
- Post #2,216
- Forum: DIY (Do-It-Yourself) Discussions
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Cavalli cth 1.3 rev a parts list and instructions needed
...). Typed in cavalliaudio.com and the Jan 14, 2011 snapshot (press 18:13:09) looks like one of the "best" to me. Quick look indicates it has all the *text* of the CTH links but little or no images. Maybe you can find better. There are CTH pictures all over (elsewhere) I think." And attached 4...- cfcubed
- Post #3
- Forum: DIY (Do-It-Yourself) Discussions
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Balanced Beta 22 amplifier repair help? I Need mine repaired...Again!
The repaired indicated in the other forum that he did suggest raising the resistor values. So it appears it may have went sort of like this: BTW should correct my statement: All β22s that have passed my way have 1R R34s & R35s. Did this even to a 4-channel/balanced build I sold because...- cfcubed
- Post #15
- Forum: DIY (Do-It-Yourself) Discussions
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Balanced Beta 22 amplifier repair help? I Need mine repaired...Again!
... Originally Posted by amb Note that increasing the value of R34/R35 will impact your output stage bias adjustment. Ohm's Law says V = I * R, so if you want 120mA of quiescent current, and R is 1 ohm, then you need to adjust VR2 to get 120mV across R34 (and R35). Think β22 w/TRS jack...- cfcubed
- Post #14
- Forum: DIY (Do-It-Yourself) Discussions
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the CTH (Compact Tube Hybrid) Rev A thread...
Thanks for the post rds, good to hear your CTH is still serving you well. Though I listen mostly to speakers these days, I do rotate a CTH in every now & then when using cans & still enjoy it.- cfcubed
- Post #593
- Forum: DIY (Do-It-Yourself) Discussions
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Cavalli Compact Tube Hybrid (CTH) Tube & Tweak thread.
Thank you for the detailed info and impressions and its nice that it was worth the effort of doing. A picture might be nice too but maybe its not too pretty:) Sometimes that keeps me from posting them. I guess if one was so motivated they could make a really compact CTH going to SMD and...- cfcubed
- Post #687
- Forum: DIY (Do-It-Yourself) Discussions
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the CTH (Compact Tube Hybrid) Rev A thread...
Had to go back in my archives for this one:) First off I suppose your CTH has a regular 9-pin socket installed.... So maybe use a "9 PIN TUBE SOCKET SAVER FOR 12AX7" or "9 pin Machine made tube socket 12AX7" (w/o center pin) from fleabay to wire the pencil tube into so it can be inserted in...- cfcubed
- Post #590
- Forum: DIY (Do-It-Yourself) Discussions
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the CTH (Compact Tube Hybrid) Rev A thread...
Sorry I did not mean to offend, sounds good - an O2 build is a good warm-up:) Good to confirm any questionable sub parts as you are doing. But concentrate on Description field value in CTH XLS BoM when an exact part # is not available from your source(s). E.g. in the Digikey BC550CGOS-ND...- cfcubed
- Post #588
- Forum: DIY (Do-It-Yourself) Discussions
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the CTH (Compact Tube Hybrid) Rev A thread...
...either BC550CTA (ammo/tape) or BC550CBU (bulk/loose). Curious, how many builds do you have under your belt? The CTH is an intermediate level build, *lots* of parts in a tiny space, and misplacement / misalignment of any can ruin your day. IOW IMO would not recommend CTH as a first project.- cfcubed
- Post #586
- Forum: DIY (Do-It-Yourself) Discussions
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the CTH (Compact Tube Hybrid) Rev A thread...
R4H & R5H are resistors you'd only purchase & use if you wanted to support more than (popular) 12.6v & 6.3v heated tubes. Most builders use a SPDT toggle 12.6v/6.3v (thus not needing R4H & R5H). See also: http://cavalliaudio.com/diy/cth/main.php?page=schematics/psschematic- cfcubed
- Post #583
- Forum: DIY (Do-It-Yourself) Discussions
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the CTH (Compact Tube Hybrid) Rev A thread...
Agreed... That's what I meant in the post I linked to, that TI's TL08xCPs are suitable subs for STMicro TL08xCNs part #s in the BoM. Part #s in BoM XLS are/were for ordering convenience of parts from Description field (e.g. TL081, TL082, etc).- cfcubed
- Post #581
- Forum: DIY (Do-It-Yourself) Discussions
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the CTH (Compact Tube Hybrid) Rev A thread...
A post I made about TL08X alternatives: http://www.head-fi.org/t/398839/a-very-compact-hybrid-amp/2205#post_11422879 For the cap(s) bet a search for "Aluminum Electrolytic 10uF 10volt" or similar would turn up some (16 volt is OK too of course). Nothing special about C1L & C1R but (try to)...- cfcubed
- Post #579
- Forum: DIY (Do-It-Yourself) Discussions
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Newbie - Alessandro/Grado Recabling question
Not a cable guy myself but a couple thoughts/opinions FWIW: * ebay & elsewhere have nice plastic pieces for Y coupler * secure the wire within the ear cup well. I used a zip tie in the repair I did on mine. Rising from a chair with headphones on while stepping on their cable has been known...- cfcubed
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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post your grado mods....
Not a mod but a fix, did a quick search & didn't see any photos of this. Got these years ago for a good deal because of loose/intermittent connection in one of the cups. While expanding the C retainer to perform the fix it snapped (of course:) where the plastic side pin is. Used a miter saw...- cfcubed
- Post #6,161
- Forum: Headphones (full-size)
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A Very Compact Hybrid Amp
...proto). Otherwise sticking with (J)FET input stage opamps, with same/"standard" pin-out, and comparable datasheets should ID others. BTW *if* RS keeps any stores open or maintains website sales (& follows through with such sales:), they appear to have TL082s...- cfcubed
- Post #2,213
- Forum: DIY (Do-It-Yourself) Discussions
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A Very Compact Hybrid Amp
Others may know better but I'd focus on rail splitter then output buffer sections - see CA DIY orig CTH site. Swapping out the chips in those sections with known-good ones could be the easy/happy path but wouldn't be surprised if you'll have to go after TO-92s as well (RS then OB). TLE2426...- cfcubed
- Post #2,211
- Forum: DIY (Do-It-Yourself) Discussions
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A Very Compact Hybrid Amp
Could you also please take a look at CTH debugging link in my sig & respond to anything else it might query?: http://www.head-fi.org/t/398839/a-very-compact-hybrid-amp/2175#post_7837361 When something goes wrong on this small of a board, with this many parts, it can be difficult & painful...- cfcubed
- Post #2,209
- Forum: DIY (Do-It-Yourself) Discussions
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Cavalli Compact Tube Hybrid (CTH) Tube & Tweak thread.
See you found it & edited your post about the CTH Rev A BoM: http://cavalliaudio.com/diy/ctha/main.php?page=parts/excelbom Looking at BoM reminded me that "single resistor" in my post means single resistor in parallel with R1H:- cfcubed
- Post #684
- Forum: DIY (Do-It-Yourself) Discussions
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Cavalli Compact Tube Hybrid (CTH) Tube & Tweak thread.
It is not a dumb question. The values you've sourced may be the closest to the "calculated" values I came up with (& probably rounded to 0.1k). IIRC the actual resistor values in CTH BOM did not exactly equal the calculated/ideal and had to be tweaked in-circuit. Think it best to stick...- cfcubed
- Post #682
- Forum: DIY (Do-It-Yourself) Discussions
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the CTH (Compact Tube Hybrid) Rev A thread...
Reviewed what info I could find and that looks like a decent sub to me for what it's used for in the CTH (relay latch). Only issue would be (unwarranted?) suspicion of it in a build that had output relay latch issues.... Which is a symptom of many things that could be wrong with a build. If it...- cfcubed
- Post #572
- Forum: DIY (Do-It-Yourself) Discussions