I just brought the beyer dt 800 Prem 600 OHM. When i'm using the aune t1 to listen to music there alot of distortion. Is there a way to fix it or something? its bothering me >_<
Aune T1 USB Tube DAC+Amp Discussion Thread ***See first post for FAQ*** - Page 215
Gear mentioned in this thread:
- Alps RK097 Volume Control and On/Off Switch
- Bass Boost Toggle Switch
- DC Auxiliary Power Jack
- Automatic On/Off (senses headphone cord)
- Texas Instruments OPA2227 Opamp in Gold-Plated DIP Socket
- Texas Instruments TLE2426 Precision Virtual Ground (2x optional)
- Decoupling Capacitors on All IC Supply Pins
- Custom 2-Layer PCB: Compact Layout with Ground Plane
- headamp board transistors are B649 / D669
- Headamp board opamps are NE5532
- PCM1793 DAC + TE7022
- DAC opamp OPA2134
I know I have asked it already but has anyone tried or willing to try rolling opamps or maybe even h-amp transistors (for example like in case of indeed/bravo tube amp)? :P Sorry if I told something wrong, I`m total noob about opamps ;D
I'm talking about just the amplifier circuit itself, not the DAC portion or the buffer portion. The CMOY circuit can be built many different ways, it does not necessarily require an OPA2227 or TLE2426. The CmoyBB implementation is just one of many. I've built at least 3-4 different implementations myself over the years.
To put it in more generic terms, the amplifier section itself is a pretty simple op-amp based headamp.
Rolling the op-amp may be an option for the advenurous, but being that it's SMT, it would require careful de-soldering / re-soldering and would run the risk of lifting trace(s) on the board.
If you'd like to get into DIY and roll opamps it might make more to sense to build an external amplifier with a socketed DIP opamp(s), which would make rolling a lot simpler.
Some that come to mind that _may_ work.
Make sure the supply voltage that the T1 is providing falls within the spec of the op amp as well. Also check the current draw, as if the power supply can't supply what's needed for the replacement opamp, it could cause other failures. Some opamps can be prone to oscillation and are harder to just drop in without other mods.
If you're not familiar with electronics, I would suggest doing plenty of reading/learning before just dropping anything in.
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From what I can tell after taking apart the T1, the amp section is basically a CMOY with switchable gain. For 600 ohm cans, it may make more sense to use the T1 as a DAC/buffer to feed an external amp. I've been playing around with it feeding my Lyr and it is a significant improvement over the internal amp.
Yeah. Any tubes u recommend or know where to buy?