russell-w
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There was mention of adding another 8 DAC chips to the unit. Is this possible? What would accomplished by doing so?
Valab NOS DAC - subjective listening and modifications
- Thread starter PatOMalley
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r8833
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russell,
you can add 8 more chips but you have to change the I/V resistors to 180R,
deal with heat sinking/ cooling of the dac chips and also the heat from the power supply because of the extra current
you can add 8 more chips but you have to change the I/V resistors to 180R,
deal with heat sinking/ cooling of the dac chips and also the heat from the power supply because of the extra current
hifi2001
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Quote:
Actually, from a power supply perspective, the "luxury" DAC's power supply sits between the original version and the DC-30W external power unit.
Original version power supply section used:
on board power transformer, ordinary caps, and off the self voltage voltage regulators.
Luxury version power supply section used:
R-Core transformer, AC input filters, ordinary caps, and off the self voltage regulators.
DC-30W power supply used:
R-Core transformer, AC input filter, better caps, and power transistors to deliver higher current-sink voltage output.
In brief, if you are looking to purchase a Valab/TerDak DAC, and have no soldering skills the luxury version is a good way to go. On the other hand, if you have some soldering skills, I think the older Valab/TerDak DAC and DC-30W is a better way to go specially if you decide to remove the on board power transformer and voltage regulators which free up lots of room for the large output film caps.
Norm
| Originally Posted by MikoLayer /img/forum/go_quote.gif The luxury version it is, then. This is to serve as a guiding post to other clueless souls like me drifting into this thread : PatOMalley highly recommends you the 'luxury version', the difference is worth it! |
Actually, from a power supply perspective, the "luxury" DAC's power supply sits between the original version and the DC-30W external power unit.
Original version power supply section used:
on board power transformer, ordinary caps, and off the self voltage voltage regulators.
Luxury version power supply section used:
R-Core transformer, AC input filters, ordinary caps, and off the self voltage regulators.
DC-30W power supply used:
R-Core transformer, AC input filter, better caps, and power transistors to deliver higher current-sink voltage output.
In brief, if you are looking to purchase a Valab/TerDak DAC, and have no soldering skills the luxury version is a good way to go. On the other hand, if you have some soldering skills, I think the older Valab/TerDak DAC and DC-30W is a better way to go specially if you decide to remove the on board power transformer and voltage regulators which free up lots of room for the large output film caps.
Norm
gfontes
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Well, I finally received the DC-30 PS and hooked it up yesterday. I immediately noticed that the bass is much more tight and focused then w/the stock PS. I assume it will improve w/burn-in as I have less then 24 hours on it.
Has anybody noticed a decrease in volume w/the DC-30? It seems that my pre needs to be at higher levels to get to the sound level that I usually listen to.
Thanks
Has anybody noticed a decrease in volume w/the DC-30? It seems that my pre needs to be at higher levels to get to the sound level that I usually listen to.
Thanks
MikoLayer
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I see. Still looks like a good compromise, too many things have gone wrong in the past when I tried to get things done myself
PatOMalley
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MikoLayer,
I'd like to know what you think of it vs the Monica 2 when you get burn-in over and done with.
I'd like to know what you think of it vs the Monica 2 when you get burn-in over and done with.
NedeUneddyBit
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r8833
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Got one of these on order ..looks like a real nice transport for 130.00 shipped
QA-550--SD Card WAV Digital Audio Player
QA-550--SD Card WAV Digital Audio Player
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Quote:
If you set volume levels by ear, you may be re-acting to background noise, so you turn up the volume to return to the original perceived level. Then the neighbours start banging on the wall. I speak from experience, I couldn't hear them ringing the doorbell!
| Originally Posted by gfontes /img/forum/go_quote.gif Well, I finally received the DC-30 PS and hooked it up yesterday. I immediately noticed that the bass is much more tight and focused then w/the stock PS. I assume it will improve w/burn-in as I have less then 24 hours on it. Has anybody noticed a decrease in volume w/the DC-30? It seems that my pre needs to be at higher levels to get to the sound level that I usually listen to. Thanks |
If you set volume levels by ear, you may be re-acting to background noise, so you turn up the volume to return to the original perceived level. Then the neighbours start banging on the wall. I speak from experience, I couldn't hear them ringing the doorbell!
donunus
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Just turned on my valab 3 hours ago and I feel they are already getting better since the moment I turned them on. Even the hum is going down in volume
Newk Yuler
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Quote:
Has anyone seen jitter test data on the cheap clocks like the one in this thing and the Teradac/Valab hardware?
Bill Allen and others (including myself) are using unquestionably very high quality reclockers from Empirical Audio with Valabs. I have a March 09 version that has only one of these cheap clocks behind the USB circuit that I don't use. I'm glad I have one of the last versions that doesn't put one of these clocks in the path of a signal I already know has a nearly (if not utterly) reference grade reclocking. I mentioned the newer second clock in the Valab to Steve Nugent when they were introduced and he commented that it's possible they introduce their own jitter.
I find it disheartening that we keep seeing these cheap clocks popping up in new hardware with advertised specs assuming greatness with no real test data and leaving no alternative to avoid them.
- Rand
.
| Originally Posted by r8833 /img/forum/go_quote.gif Got one of these on order ..looks like a real nice transport for 130.00 shipped QA-550--SD Card WAV Digital Audio Player |
Has anyone seen jitter test data on the cheap clocks like the one in this thing and the Teradac/Valab hardware?
Bill Allen and others (including myself) are using unquestionably very high quality reclockers from Empirical Audio with Valabs. I have a March 09 version that has only one of these cheap clocks behind the USB circuit that I don't use. I'm glad I have one of the last versions that doesn't put one of these clocks in the path of a signal I already know has a nearly (if not utterly) reference grade reclocking. I mentioned the newer second clock in the Valab to Steve Nugent when they were introduced and he commented that it's possible they introduce their own jitter.
I find it disheartening that we keep seeing these cheap clocks popping up in new hardware with advertised specs assuming greatness with no real test data and leaving no alternative to avoid them.
- Rand
.
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