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.

F6 Illustrated Build Guide
F6 Illustrated Build Guide
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 26th November 2018, 01:37 PM   #1271
jonbon is offline jonbon  Norway
diyAudio Member
 
Join Date: Nov 2015
Ok, I'll seek out some grade Bs.

Back to the hum(still have one working channel):

Should I hear ticks at the output when I touch the chassis with no input connected?
To me it sounds logical since ground is chassis bound. (Although elevated by CL60).
Should putting your hand between the jensen and input lead (mid air) produce groundloopy noises at output? Any measurements for poor connections to check?

Hum remains with shorted input, but is a bit lower.
  Reply With Quote
Old 10th December 2018, 01:29 AM   #1272
meanie is offline meanie  Singapore
diyAudio Member
 
Join Date: Jul 2018
Location: Singapore
My newly built F6 has been running for a week with no issue so far.
However the supply rails are much higher than what is shown in the schematic.

I m having +/- 25.2v , but schematic printed +/- 23V.

My PS board is stock original from DiyStore, did i do something wrong ?
  Reply With Quote
Old 10th December 2018, 01:31 AM   #1273
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
F6 Illustrated Build Guide
You are testing the PSU with no load at the moment.



Normal
  Reply With Quote
Old 10th December 2018, 01:36 AM   #1274
meanie is offline meanie  Singapore
diyAudio Member
 
Join Date: Jul 2018
Location: Singapore
Ok, thanks.

Let me go and get a pair of an 8ohms dummy load resistor and perform the full load test.
Wonder how much watts before clipping can i get.
  Reply With Quote
Old 10th December 2018, 01:40 AM   #1275
Bare is offline Bare  Canada
diyAudio Member
 
Join Date: Dec 2001
Location: vancouver
No.. 25 v seems fairly common. It's what mine does
I wouldn't waste time worrying over it. OR trying to 'fix' it
  Reply With Quote
Old 10th December 2018, 02:10 AM   #1276
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
F6 Illustrated Build Guide
If your power supply is actually making +/- 25v with the amplifier boards connected, that's wonderful!!

You don't need to change a thing and everything will run beautifully. (And you'll get a bit more output power as well. )

22.5 seems to be most people's rails under load.
  Reply With Quote
Old 10th December 2018, 02:18 AM   #1277
meanie is offline meanie  Singapore
diyAudio Member
 
Join Date: Jul 2018
Location: Singapore
Good to hear that, makes me less worry now.Thanks
  Reply With Quote
Old 10th December 2018, 06:15 AM   #1278
henryve is offline henryve  South Africa
diyAudio Member
 
henryve's Avatar
 
Join Date: Jun 2008
Location: Strand
Quote:
Originally Posted by meanie View Post
Good to hear that, makes me less worry now.Thanks
Your supply voltage is probably higher than advertised by your utility. I know mine is.

I would not sweat the small stuff.
  Reply With Quote
Old 10th December 2018, 08:27 AM   #1279
jonbon is offline jonbon  Norway
diyAudio Member
 
Join Date: Nov 2015
Quote:
Originally Posted by jonbon View Post
Ok, I'll seek out some grade Bs.

Back to the hum(still have one working channel):

Should I hear ticks at the output when I touch the chassis with no input connected?
To me it sounds logical since ground is chassis bound. (Although elevated by CL60).
Should putting your hand between the jensen and input lead (mid air) produce groundloopy noises at output? Any measurements for poor connections to check?

Hum remains with shorted input, but is a bit lower.
So, to continue my lone quest for unhumness, I have changed all but one input JFET. And now the hum is barely audible when i put my ear to the speaker (99db sensitivity). Hand movements do no longer induce noise. Perfect.

Not sure what happened, but now its time to enjoy some music.
  Reply With Quote
Old 28th December 2018, 08:55 PM   #1280
Dennis Hui is offline Dennis Hui  Canada
Hoopy Frood
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
F6 Illustrated Build Guide
Quote:
Originally Posted by mihstef View Post
Thank you very much for your advices; very useful for me.







As a conclusion: Certainly I'm also very interested in this UMS.

So, for the moment we are 4. Another one person and this good hope to become reality. Click the image to open in full size.
Did the USM 4U/400 chassis ever happen?

Dennis
__________________
We are fearless amplifier builders. A little heat doesn't scare us at all.
- NP 2002
  Reply With Quote

Reply


F6 Illustrated Build GuideHide 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
Aleph J illustrated build guide 6L6 Pass Labs 3373 15th January 2019 05:55 PM
diyAudio Power Supply Circuit Board v3 illustrated build guide 6L6 Power Supplies 786 4th January 2019 01:52 AM
BA-3 Amplifier illustrated build guide 6L6 Pass Labs 163 28th November 2018 10:26 AM
ACA illustrated build guide 6L6 Pass Labs 153 24th November 2018 08:18 AM
F5Turbo Illustrated Build Guide 6L6 Pass Labs 472 30th September 2018 06:15 PM


New To Site? Need Help?

All times are GMT. The time now is 05:32 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki