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Head-Fi - Bijou All Tube Futterman Headphone Amplifier
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Quote: Originally Posted by runeight It's like tube rolling. How can two tubes of the same type with exactly the same electrode construction and spacings sound different?? But for some reason we think that they do. So, I don't know . . . Runeight, Regal, thank you! That's an interesting discussion. I'm not sure that I'…
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Quote: Originally Posted by regal Read about caps here, ESR has little correlation with sonics.ecp.cc Regal, thank you. I mentioned ESR because people (and in this thread too) are talking about ESR when they compare the audio quality of different caps. I don't think (as I mentioned before) ESR matters that much (agree…
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Quote: Originally Posted by regal Today a replaced the eletrolytic coupling caps with 80 uF Sprague oil filled can capacitors. It is amazings how much clarity comes thru now. What are the opinions of the Bijou with no NFB powering a pair of 300 ohm Sennheisers? My current headphones are 600 ohm and they definetaly sound better…
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Quote: Originally Posted by amphead Here is a link to the 410uF photoflash caps that I used.RUBYCON PHOTO FLASH / STROBE ELEC CAPACITOR 410UF 300SV - eBay (item 180242991066 end time Aug-12-08 08:48:03 PDT) Here is a link to the 47uF Ruby Gold caps that I used.Ruby Gold Caps 47 mfd @ 500V axial-style capacitor - eBay (item…
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Quote: Originally Posted by amphead Edit: yeah thats good news Rfsam, happy to hear that you have built another great sounding amp! I'm really enjoying the sound too, but just another tweak to see if I can get even more. Amphead, thank you :-) I'll try to reduce the hum by using the grounded wiring scheme proposed by…
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sorry
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Quote: Originally Posted by amphead Did it make a positive change? Uh well yes, can I say Orpheus for the cash challenged? Wow! Nice and plump(like a fat grub from the Australian outback, juicy) signature, with plenty of detail. Fat bass and mids just right. Vocals golden, no distortion. I couldn't be happier with the sound now!…
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Quote: Originally Posted by runeight Pictures look great. I hope that you can finish the casing soon. Alex, thank you! The casing is finished, I just removed the top cover that also hold the back panel. I'm not sure if my casing is optimal. If I would start from the beginning I probably would go with externally mounted…
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Quote: Originally Posted by runeight These numbers are not so bad and if it weren't for the heater voltages, things would run happily at 122VAC on the 110VAC windings. An alternative is to go back to 120V operation and simple set the B+ to 240V. I think the amp will sound about the same. Another alternative is to run at 110V and…
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Quote: Originally Posted by runeight I agree with regal. The tube is not necessarily bad, but it is fairly far away from the norm. You could try letting it break in for a while to see if the emissivity of the cathode increases. I have ~20 hours on those JJs. Quote: Originally Posted by runeight…