Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

A guide to building the Pass F4 amplifier.
A guide to building the Pass F4 amplifier.
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 May 2017, 09:46 AM   #951
Benji90 is offline Benji90  Italy
diyAudio Member
 
Join Date: Oct 2014
Location: Trieste
Thank you Zen Mod. I have a tube pre with, from what I understand, lot's of voltage swing but not may current capabilities, so I thought that a higher input impedance could help. I have no idea about my cables capacitance. Anyway it can be quite an interesting experimentation!
  Reply With Quote
Old 23rd May 2017, 09:48 AM   #952
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
A guide to building the Pass F4 amplifier.
just try it and - don't forget to have fun

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...Đ by Mighty ZM
  Reply With Quote
Old 23rd May 2017, 01:46 PM   #953
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by Benji90 View Post
Thank you Zen Mod. I have a tube pre with, from what I understand, lot's of voltage swing but not may current capabilities, so I thought that a higher input impedance could help. I have no idea about my cables capacitance. Anyway it can be quite an interesting experimentation!
The input impedance has virtually no effect on the cable capacitance effects.
It's the Source impedance that most affects the cable capacitance effects. This becomes a low pass filter, which you can use to attenuate RF interference if you know the impedances

The Receiver impedance does affect the high pass filter effect created by the DC blocking capacitor.
__________________
regards Andrew T.
  Reply With Quote
Old 17th June 2017, 11:26 PM   #954
anystereo is offline anystereo  United States
diyAudio Member
 
Join Date: Apr 2005
Location: watertown, ma
Question about matched pairs of 2SK170/2SJ74 for the F4 amps. I have a bunch of each of these that i bought a few years ago for the burning amps etc, they are A's . The matched pairs of 2SK170/2SJ74 from the diystore are out of stock. Should I wait for them to come back in stock or just make up pair up pairs from the A series that i have? Am I gambling on performance?
  Reply With Quote
Old 18th June 2017, 12:00 AM   #955
KevinHeem is offline KevinHeem  United States
diyAudio Member
 
KevinHeem's Avatar
 
Join Date: Nov 2007
Location: Hudsonville, MI
A guide to building the Pass F4 amplifier.
What's the Idss of your grade A pairs?
  Reply With Quote
Old 18th June 2017, 12:18 AM   #956
anystereo is offline anystereo  United States
diyAudio Member
 
Join Date: Apr 2005
Location: watertown, ma
both the 170's and the 74 A's are 2.6-6.5
  Reply With Quote
Old 18th June 2017, 12:33 AM   #957
KevinHeem is offline KevinHeem  United States
diyAudio Member
 
KevinHeem's Avatar
 
Join Date: Nov 2007
Location: Hudsonville, MI
A guide to building the Pass F4 amplifier.
i mean the actual Idss as tested
  Reply With Quote
Old 18th June 2017, 12:57 AM   #958
KevinHeem is offline KevinHeem  United States
diyAudio Member
 
KevinHeem's Avatar
 
Join Date: Nov 2007
Location: Hudsonville, MI
A guide to building the Pass F4 amplifier.
http://www.diyaudio.com/forums/attac...urement-v1.pdf
  Reply With Quote
Old 25th June 2017, 10:08 PM   #959
anystereo is offline anystereo  United States
diyAudio Member
 
Join Date: Apr 2005
Location: watertown, ma
Thanks for the link, I guess I got a do the set up and test them to do it right
  Reply With Quote
Old 20th July 2017, 09:38 PM   #960
webercarbmann is offline webercarbmann
diyAudio Member
 
Join Date: Feb 2002
Location: Roskilde, Denmark
Default PSU voltage

Hi all is you.
I have an F4 that I would finish. Question: Would it be a problem to use 2 x 16V AC transformers for these amplifiers. It should give a lower power output but besides this, anny problems? Best regards. Peter Jensen
  Reply With Quote

Reply


A guide to building the Pass F4 amplifier.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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
An illustrated guide to building an F5 6L6 Pass Labs 986 29th July 2017 06:20 AM
A Concise Guide to the Published Amplifier Circuits of Nelson Pass rsdio Pass Labs 50 1st May 2017 03:56 PM
My,PASS ALEPH J and f4 xr000 Pass Labs 1 25th December 2009 03:20 AM
Idiotīs guide to building Pass amps? judge Pass Labs 3 19th December 2004 11:33 PM


New To Site? Need Help?

All times are GMT. The time now is 01:00 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki