oneplustwo Aleph X build thread - Page 16 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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
Reply
 
Thread Tools Search this Thread
Old 23rd February 2013, 03:53 PM   #151
diyAudio Member
 
oneplustwo's Avatar
 
Join Date: Apr 2009
Location: San Francisco
On the aleph vs f5 question, I don't really have enough to go off on. I've never done an AB comparison and I don't have a balanced source at the moment to take advantage of the balanced nature of the aleph x. (Getting an emotiva xda2 next time they go on sale... Sold my xda1.)

I will say that I do love the f5 dcb1 combo. The extra power of the aleph x is nice but I never really missed it before. Sound quality wise, it's a tough call without doing a real controlled comparison. And I am no authority on these things. In my mind, I build because I like to build. And if the sound is good, then I don't worry about the differences so much.

__________________
My Projects
  Reply With Quote
Old 23rd February 2013, 04:13 PM   #152
Eric is offline Eric  United States
diyAudio Member
 
Eric's Avatar
 
Join Date: Nov 2000
Location: Central PA, USA
Interesting that you say you've "lost" your .1 system after moving to DIY. I was looking to make a small, but high quality, 2.1 system for either home or office. I'm debating between an F5 and ACA front ended by a DCB1 driving a set of DIY speakers and a 10" sub. From what I have read, others report the DCB1 has plenty of drive for dual outputs to an amp and a sub amp. I will run the two main speakers full range (they will probably be smallish bookshelf type) and get a good plate amp for a 10-12" driver. I'm aiming for a sealed sub with a small footprint.
__________________
My DIY Basement Theater, Aleph-X Amplifers and Avro Open Baffle Speaker construction pages.
  Reply With Quote
Old 24th February 2013, 12:27 AM   #153
diyAudio Member
 
oneplustwo's Avatar
 
Join Date: Apr 2009
Location: San Francisco
Confirmed with my Fluke 45 that AC ripple is about the same on both channels... about 17mV. I then measured with my new Agilent U1252A handheld DMM (thanks grenert!) and got only 0.5mV. Confused, I whipped out my new to me Tektronix 2465 scope (thanks again to grenert) to see what was going on and saw about 50mV peak to peak which I believe measures to 17mV RMS (Amplitude/sqrt(2)). So I guess bench top DMMs are truly better! And this Agilent DMM is no slouch.

Can someone verify my thinking here?
__________________
My Projects

Last edited by oneplustwo; 24th February 2013 at 12:31 AM.
  Reply With Quote
Old 24th February 2013, 12:30 AM   #154
diyAudio Member
 
oneplustwo's Avatar
 
Join Date: Apr 2009
Location: San Francisco
Sounds like a good plan. I'm thinking about building my F4 for the office with a couple small TABAQ speakers. No need for a sub in the office!

I was going to buy a sub amp, but I was thinking about going cheap and using my chip amp as a sub amp. Just needed a way to get the crossover between it and the mains... thus the DCX2496 on the way to me from djdeals.com. I hope. They seem a little on the sketch side. We'll see.

Anyway, I figured this would also give me flexibility to try bi amping or some other sort of configuration in the future.

Quote:
Originally Posted by Eric View Post
Interesting that you say you've "lost" your .1 system after moving to DIY. I was looking to make a small, but high quality, 2.1 system for either home or office. I'm debating between an F5 and ACA front ended by a DCB1 driving a set of DIY speakers and a 10" sub. From what I have read, others report the DCB1 has plenty of drive for dual outputs to an amp and a sub amp. I will run the two main speakers full range (they will probably be smallish bookshelf type) and get a good plate amp for a 10-12" driver. I'm aiming for a sealed sub with a small footprint.
__________________
My Projects
  Reply With Quote
Old 24th February 2013, 04:04 PM   #155
Eric is offline Eric  United States
diyAudio Member
 
Eric's Avatar
 
Join Date: Nov 2000
Location: Central PA, USA
Quote:
Originally Posted by oneplustwo View Post
Confirmed with my Fluke 45 that AC ripple is about the same on both channels... about 17mV. I then measured with my new Agilent U1252A handheld DMM (thanks grenert!) and got only 0.5mV. Confused, I whipped out my new to me Tektronix 2465 scope (thanks again to grenert) to see what was going on and saw about 50mV peak to peak which I believe measures to 17mV RMS (Amplitude/sqrt(2)). So I guess bench top DMMs are truly better! And this Agilent DMM is no slouch.

Can someone verify my thinking here?
This sounds about right to me. The "typical" small, handheld DMM doesn't really provide the whole picture - many of them are great, but lack an RMS read. In my CRC, I can measure about 200mV on the first C, I drop about 1.7V across 0R2, and then I measure about 5mV on the last C. I'm running ~22v rails at about 8A bias. The funny thing is that bias changes (lowers) as the amp warms up.

Those 100w monoblocks get large and heavy in a hurry, huh? But they sure do sound nice!
__________________
My DIY Basement Theater, Aleph-X Amplifers and Avro Open Baffle Speaker construction pages.
  Reply With Quote
Old 25th February 2013, 11:13 PM   #156
diyAudio Member
 
oneplustwo's Avatar
 
Join Date: Apr 2009
Location: San Francisco
Yes, very heavy. I still have yet to weigh them, but I'm pretty sure they're close to 50lbs each. Maybe that will be my exercise tonight.
__________________
My Projects
  Reply With Quote
Old 26th February 2013, 03:10 PM   #157
Eric is offline Eric  United States
diyAudio Member
 
Eric's Avatar
 
Join Date: Nov 2000
Location: Central PA, USA
Quote:
Originally Posted by oneplustwo View Post
Maybe that will be my exercise tonight.
Ha- you're funny. A true DIYer is an obsessive compulsive tweaker. Such activities clearly extend beyond a single evening. Thus, you have several weeks of exercise before you (unless your work area isn't the middle of the living room floor after the kids are in bed).

Be careful, or we'll have to revoke your DIY license...
__________________
My DIY Basement Theater, Aleph-X Amplifers and Avro Open Baffle Speaker construction pages.
  Reply With Quote
Old 26th February 2013, 03:28 PM   #158
diyAudio Member
 
oneplustwo's Avatar
 
Join Date: Apr 2009
Location: San Francisco
I'm considering upgrading to jfet front end but I'm not sure I'm up to the task. Instead, I think I'll work on the 10 other projects in various states of completion. Anyone care to vote for F4 or penultimate Zen 4? They're next up. I also need a small speaker project to go with the F4. Was thinking tabaq or some other single driver design. Open to suggestions.
__________________
My Projects
  Reply With Quote
Old 26th February 2013, 03:38 PM   #159
Eric is offline Eric  United States
diyAudio Member
 
Eric's Avatar
 
Join Date: Nov 2000
Location: Central PA, USA
Upgrading the Aleph-X front end is my next project. I've just ordered some JFETs from Spencer and am waiting for them to arrive. Between these and others that I've picked up and matched on my own, I have enough for my Aleph-X amps, an F5 build, and a few DCB1 boards that I have. William and Graeme have been very helpful in helping me understand the process of replacing the 9610s with JFETs. As I begin the actual work, I'll update this section of my web page. Given all of the other things going on in life, this is likely to take another few weeks to months...
__________________
My DIY Basement Theater, Aleph-X Amplifers and Avro Open Baffle Speaker construction pages.
  Reply With Quote
Old 26th February 2013, 03:38 PM   #160
6L6 is online now 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
ZV4 or F4? Wow - those are two designs I really like... It's hard to choose!

The F4 can use your F5 PSU, so it's likely easier to make...

The ZV4 is an older design that hasn't had much attention in a long time -- It could probably use the love!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Loudspeaker Build Thread Hsmeets Multi-Way 67 15th August 2012 01:30 PM
oneplustwo F5 build thread oneplustwo Pass Labs 251 30th May 2012 09:36 PM
oneplustwo DCB1 Black, White and Red build thread oneplustwo Pass Labs 1 26th February 2012 06:11 AM
aikido build thread- nate Tubes / Valves 1 27th February 2009 05:01 AM
Dan's Aleph Build Thread monarodan Pass Labs 19 14th February 2007 11:06 AM


New To Site? Need Help?

All times are GMT. The time now is 04:17 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2