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Teac Reference Line UD-501 USB DAC "DSD" - Page 22

post #316 of 323

Has anyone perhaps compared this UD-501 to the UD-301? Used purely as a DAC, other than the filters and 384khz capability, are there any differences (functionally or sonically)?

post #317 of 323
Quote:
Originally Posted by xenithon View Post
 

Has anyone perhaps compared this UD-501 to the UD-301? Used purely as a DAC, other than the filters and 384khz capability, are there any differences (functionally or sonically)?

The major difference is in headphone amp section, UD501 seems to have dual op-amp units for each channel, while UD301 seems to have only single op-amp unit for each channel. 

post #318 of 323
Quote:
Originally Posted by fb24601 View Post

The major difference is in headphone amp section, UD501 seems to have dual op-amp units for each channel, while UD301 seems to have only single op-amp unit for each channel. 

No, UD501 only has one dual op-amp per channel in the head amp. This stage immediately follows the analogue stage after the dac and is in fact one of the three output options that follow ie RCA, XLR and the head amp. This means the quality of the head amp is affected by the I/V filter op amps and output caps and then it's own op amps and output caps.

The UD301 has capacitor-less output head amp so one less thing to worry about. It also seems from the teac website the UD301 head amp has an additional op amp stage making it two op amp ics per channel. Could be the buffer for cap less output?

The website also says only two muses op amps are used whereas in the 501 four are used, two per channel for the I/V. Voltage rails are + and -12V with each channel powered by a separate transformer. The 301 only has one transformer so maybe the voltage swing is less, and only one Muses used?

I changed out all the op amps in my 501 as well as the output caps, voltage regs and power caps. The head amp can drive T1's to deafening levels at less than half way up the volume knob with its op amps changed to dexas.
Edited by 37mil - 1/30/15 at 9:43am
post #319 of 323

I just looked up some 301 internal pics on the net and saw it does have 3 dual op amps per channel. Oddly, it seems the muses are placed at the I/V stage mixed with one 5532 followed by another 5532 filter output.

The 501 had two muses for the I/V followed by the 5532 per channel.

Maybe an expert can clarify?

post #320 of 323

How does this unit sound compared to iDSD Micro, Geek Out 1000, Oppo HA-1?

post #321 of 323

Can the UD-501 drive Alpha Dog well?  Thanks!

post #322 of 323
Quote:
Originally Posted by apichetk View Post

Can the UD-501 drive Alpha Dog well?  Thanks!

I'm not sure about Alpha Dogs but it can drive T1s pretty damn fine. Definitely nowhere near maxing out the volume pot at listenable volumes.

I changed the op amps with dexas and it's pretty nice.
post #323 of 323
Thanks for your response!
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