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Head-Fi - A Very Compact Hybrid Amp
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Would anyone in/near Australia be interested in a completed CTH amplifier? I made five, and one person pulled out of paying for one.. So I have a spare fully made and tested, with the C3H modification and perforated top (thanks wiatrob!) and the choice between a few different tubes I have. All the rest are working and sounding great!
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Just thinking out loud, would a ripple on B+ cause hum? Has anyone looked at the B+ waveform loaded/unloaded? Of course, make sure your oscilloscope can handle ~100V inputs (or AC couple it). Is VG stable compared to SG? And is it recommended that SG point be connected to anything? I've read that people haven't noticed a change when grounding the pot. Is it worth…
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Quote: Originally Posted by runeight Yes to the first question. You are correct about the buffer. Its Zi is so high that increasing C4 is unlikely to affect the base response. Are you hearing variations in base with different tubes? Excellent. Yes I am hearing different bass with different tubes, I just wanted to check…
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Just two quick questions: With my headphones (MS-1's, 32 ohm), I only have to turn the pot about 1/3rd around to get the maximum volume I'd want. I am using 100 ohm resistors for R18L/R. Would roughly doubling R18 give me more control with the pot? And will this decrease the noise present? Secondly, would increasing the value of C4 improve the bass response? Or is the…
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Question, would increasing the value of C4 improve the bass response? Or is the input impedence into Q4/Q5 sufficiently high that it would not make a noticeable difference increasing C4 to 470nF/1uF?
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I had some hum when using it with my Gamma1 DAC running on DC power. Using USB power eliminates it.
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Quote: Originally Posted by adamus closeup of the suspect area Do you have a photo of the underside too? I'll compare it to one of mine and see if I can spot anything.
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Quote: Originally Posted by zkool448 I also have to build me this A/B box by danobeavis first since it's probably that only way I can distincttively identify their similarities and/or differences. That's the next thing I want to build too! That way I can better compare between different tubes using two CTH's.
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Quote: Originally Posted by Coreyk78 Just for fun I tried replacing C10P with another cap I had, and tried a different tube, just in case that had anything to do with it. Same thing happened though, the e12 switched to green, but I was watching C10 closely and I could see the top of the can start to swell so I quickly turned it…
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Yep, you need D5H. The instructions should maybe say "Do not install D5H yet". If you read on it says to install it in step 5.