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HeadphoneHamster
0
Feb 18, 2016
My TA-03 definitely runs out of steam trying to power my HiFiman H400S. Has anyone achieved appreciable extra gain by changing the Tubes? I've seen a few comments but since it's been a little while now I was hoping for some updated feedback please. Thanks in advance!
Justin_1
29
Dec 30, 2016
HeadphoneHamsterI have a Mullard K-61 series pre-amp tube and some Russian gold grid NOS tubes on order now. When they come in I'll let you know. And the part numbers I use. The standard 6c19 Chinese tubes are probably fine. It's most likely the pre-amp tube not performing. My best guess/opinion. But I'll let you know. I have the massdrop AKG 7xx headphones on the way and I'll try to re-post once I test everything. Cheapest route is to check Craigslist for a local tube supplier, they will usually test your tubes and offer a suggestion based on what they have on stock. But I live in Dallas smaller cities may not have that option. :(
HeadphoneHamster
0
Dec 30, 2016
Justin_1Thanks Justin, I really appreciate your advice. Will definitely check out CL for a local tube dealer but would love to hear your thoughts when your new tubes arrive. I've tried a few different headphones with varying resistance from 25 to 600ohm but no real difference in headroom or lack thereof. A few other people seem to have had the same issue.
All the best,
Jeremy.
Justin_1
29
Jan 14, 2017
HeadphoneHamsterNoticeable change in output. See my post above for photos and parts I used. Now you do have another choice there is a UK seller on ebay, selling a Telefunken pre-amp tube that from my reading was original meant for computers back in the day with 130-140 milliamps rating. For 58.04$ USD under the title of 6211/ECC802S/12AU7 TELEFUNKEN on ebay. They tend to be a little crisper and you loose some of that old fashion tube sound, but the higher output will go in to the main amp tubes. May provide that extra punch you need. You'd need to research a bit, but it should work just fine to, but weren't original designed for pre-amp sound from what I read. I choose Mullard because most consider them to be the best after Telefunken. But NOS of Telefunken is hundreds of dollars US. So I bought a used tested Mullard. Some sellers will show you the test output readings on the auction. I would only buy a pre-amp NOS or Used only if this testing values are shown by the seller. My opinon mind you. Mostly because they are two channel, so if they are not balanced... well you get the idea I'm sure.
Zackobrien
17
Apr 26, 2018
HeadphoneHamsterTubes are not good for low impedance headphones. Should've went with solid state for a planar instead.
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