Experience with this DIY DAC ? - Page 153

Bill Fuss · 19th November 2009, 08:02 PM

The secondary RC filter pretty much works independently from the rest of the circuitry.

I know the F5 has a huge bandwidth. If you are already using a 1K/.0022 filter it would be better to limit the bandwidth at the F5s input circuitry. That has been discussed by Mr Pass, I believe even in his original article. 10pf across the inputs comes to mind, but I could be off.

Ryssen · 19th November 2009, 10:25 PM

Tried 10pf and later 20pf,the temprature is a littel better but still a little to much.
How high can I go on the capasistor before it starts affecting the hearing area?

Bill Fuss · 20th November 2009, 12:53 AM

That's a tough question for me to answer. It's best that you post on the F5 thread to possibly get an answer from the master, NP. I built one but I really didn't like it, but don't tell Mr Pass.

Ryssen · 20th November 2009, 02:50 PM

Quote:

but don't tell Mr Pass

Atlplasma · 20th November 2009, 08:37 PM

I thought someone might be able to help me diagnose this issue.

I recently noticed a big difference between playback levels between my Mac Mini (which is outputting to the DAC via USB) and my Oppo 980 player. A few weeks ago I pushed my receiver to clipping (for just a moment) while using the Mini/DAC setup. Ever since, it seems that I have to "crank" the receiver to produce a normal loudness level. As a reference, -20 dB is pretty loud when using the Oppo. The Mini/DAC might need to go to -0 dB for a comparable level.

There's no distortion, buzzing, humming, or odd artifacts during playback either way. The speakers seem fine. The receiver is fine. It's just odd.

wushuliu · 21st November 2009, 08:57 AM

If anyone's interested I'm selling my UTC A20's. $80 shipped in the U.S. $80 plus for international...

brianco · 21st November 2009, 12:28 PM

Vintage NOS UTC TRW A-20 Transformer Tube Amp Pair. Search US Ebaaay!

About 27 Bucks with 12 hours to go!

Bill Fuss · 21st November 2009, 01:24 PM

80 bucks shipped is a great price.

McCrackers · 21st November 2009, 03:11 PM

Quote:

Originally Posted by wushuliu

If anyone's interested I'm selling my UTC A20's. $80 shipped in the U.S. $80 plus for international...

Why?

gabanyayaya · 21st November 2009, 03:49 PM

Quote:

Originally Posted by McCrackers

Why?

Maybe getting bored with 'soft' sound of the A-20.....

Maybe tube stage much better..........

19th November 2009, 10:25 PM	#1522
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	Tried 10pf and later 20pf,the temprature is a littel better but still a little to much. How high can I go on the capasistor before it starts affecting the hearing area? __________________ Regards Åke

21st November 2009, 12:28 PM	#1527
brianco diyAudio Member Join Date: Aug 2005 Location: Scottish Borders - Kelso; on the famous Tweed River!	Looks like a bargain - at the moment! Vintage NOS UTC TRW A-20 Transformer Tube Amp Pair. Search US Ebaaay! About 27 Bucks with 12 hours to go!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
A.O.S - Any experience?	Keltern	Multi-Way	13	2nd August 2011 08:33 AM
my t-amp experience	Eggzy	Chip Amps	35	17th December 2005 07:29 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

19th November 2009, 08:02 PM	#1521
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	The secondary RC filter pretty much works independently from the rest of the circuitry. I know the F5 has a huge bandwidth. If you are already using a 1K/.0022 filter it would be better to limit the bandwidth at the F5s input circuitry. That has been discussed by Mr Pass, I believe even in his original article. 10pf across the inputs comes to mind, but I could be off.

20th November 2009, 12:53 AM	#1523
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	That's a tough question for me to answer. It's best that you post on the F5 thread to possibly get an answer from the master, NP. I built one but I really didn't like it, but don't tell Mr Pass.

20th November 2009, 08:37 PM	#1525
Atlplasma diyAudio Member Join Date: Jun 2009	I thought someone might be able to help me diagnose this issue. I recently noticed a big difference between playback levels between my Mac Mini (which is outputting to the DAC via USB) and my Oppo 980 player. A few weeks ago I pushed my receiver to clipping (for just a moment) while using the Mini/DAC setup. Ever since, it seems that I have to "crank" the receiver to produce a normal loudness level. As a reference, -20 dB is pretty loud when using the Oppo. The Mini/DAC might need to go to -0 dB for a comparable level. There's no distortion, buzzing, humming, or odd artifacts during playback either way. The speakers seem fine. The receiver is fine. It's just odd.

21st November 2009, 08:57 AM	#1526
wushuliu diyAudio Member Join Date: May 2008 Location: Los Angeles	If anyone's interested I'm selling my UTC A20's. $80 shipped in the U.S. $80 plus for international...

21st November 2009, 01:24 PM	#1528
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	80 bucks shipped is a great price.

Currently Active Users Viewing This Thread: 2 (1 members and 1 guests)
Lulu_the_cat