My F4 Build - Page 6 - 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 11th March 2013, 09:57 AM   #51
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
caps with hot glue .......

solution good for prototyping , but not for permanent use

both clumsy and unsafe

use some veroboard + wire or raw pcb material , and exacto knife to form traces ( in that case - more fields than traces )
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 11th March 2013, 12:02 PM   #52
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
I had thought about using PerfBoard and just running bare 16awg solid I have.
  Reply With Quote
Old 11th March 2013, 12:15 PM   #53
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
yup

Perfboard = veroboard ( this side of big splash)
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 12th March 2013, 07:30 PM   #54
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
200va is too small for stereo. Get two or wait for bigger ones to arrive.
  Reply With Quote
Old 12th March 2013, 11:00 PM   #55
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
I will stick to the 300VA.
  Reply With Quote
Old 18th March 2013, 01:26 AM   #56
diyAudio Member
 
The Space Egg Corp's Avatar
 
Join Date: Sep 2010
Location: London & Miami
Blog Entries: 13
I stuck to a 300VA once...

...but was using 'super-glue' not hot-glue.

Mmmm...

Cheers

Si.

( nice one Einric ! )
  Reply With Quote
Old 9th June 2013, 10:54 PM   #57
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
Alright, The ball is rolling once again.
I was thinking since I will be force cooling this amp should I use a 400VA transformer so I can have more overhead on the bias?
Or will the 300VA Antek be suitable up to 400mV bias?
I know the build guide shows 300mV being the "Sweet Spot" but with forced cooling I should have more bias ability.

I will be ordering all the P/S parts in the next few hours, HAPPY FATHERS DAY TO ME!!!!
  Reply With Quote
Old 9th June 2013, 11:30 PM   #58
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
400mv =.4
Across a .47ohm is (.4V/.47R) = 0.85A per device,
With 23V rails .85*23 = 19.6Watts per device.

19.6*12 = 234W of standing bias. That's quite a bit to ask from a 300VA transformer. (And awfully hot as well...)

Use a 400VA.

Also, the distortion gains when biased past 300mV were very small compared to the current required. However, if you have the power and heatsinks, by all means try it.
  Reply With Quote
Old 9th June 2013, 11:38 PM   #59
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
Sweet! 6L6 you have always been a valued source of insight.
400VA it is, The size is only .1" larger so it shouldn't cause any space issues.
I will order the AS-4218 as soon as supper is over.
  Reply With Quote
Old 9th June 2013, 11:40 PM   #60
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
The AS- series is fantastic, they are shielded, which is totally worth the extra ten bucks.

I have two sitting on a shelf waiting for a special project. (I don't know what yet...)
  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
Between F4 and F5 Joshua_G Pass Labs 28 26th November 2011 11:41 PM
Sharing my build progress of the F4 and Aleph 30 eeyore Pass Labs 2 9th May 2011 12:42 AM
first watt f4 help me!!!! mosfet1 Pass Labs 2 18th May 2008 06:44 AM
Any F4 PCBs left for a new wanna-build-one? giacomo_pagani Pass Labs 8 12th May 2008 11:06 PM
F4 and DAC? Flecko Pass Labs 9 23rd February 2008 09:57 PM


New To Site? Need Help?

All times are GMT. The time now is 01:31 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