choke input ripple level? - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 16th September 2005, 02:54 PM   #1
diyAudio Member
 
Join Date: Jun 2004
Location: Taipei
Default choke input ripple level?

I build a 6DJ8 pre with the psu of http://diyparadise.com/preamptutorial.html

I think it's an easy question, but...

How low is the ripple level should be for a B+ of 200VDC?

Is it ok for 10VAC?

I heard hum.. noise about 30cm from speaker and sss.. noise about 60cm.

Thanks for your reply.
  Reply With Quote
Old 16th September 2005, 06:13 PM   #2
diyAudio Member
 
Gabevee's Avatar
 
Join Date: Feb 2002
Location: Richmond, VA.
So.... your hum is lower than the noise floor? This is good.

Of course, we want no hum at all. So we want to find out if the hum is actually from the B+ or another source.

Do you see 10VAC on the 200VDC B+ line? Bad. However it should sound much louder than less than the ssssss.

How are you looking at the 10 volt AC?

Have you actually used 50H chokes???

Need more info, please.

Thanks!
Gabe
__________________
Gabe CGV Electronics
Home of the CGV-300B amplifier on a budget
  Reply With Quote
Old 16th September 2005, 06:28 PM   #3
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
The PS hum should be about half a millivolt.

If you can hear hum, there's too much. My first guess would be the grounding and/or layout.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 16th September 2005, 10:36 PM   #4
amperex is offline amperex  United States
diyAudio Member
 
Join Date: Feb 2005
Location: MI
I prefer nothing more than .001% ripple in the B+ for preamps.
  Reply With Quote
Old 16th September 2005, 11:16 PM   #5
diyAudio Member
 
Join Date: Jun 2004
Location: Taipei
to Gabevee,

Thanks your reply.

Quote:
How are you looking at the 10 volt AC?
I use a ditigal multimeter to probe tha B+ and ground.Switch AC and DC to measure it.

Quote:
Have you actually used 50H chokes???
No, I use two 20H chokes and (47+47)uF for each C.

To SY, amperex,

the ripple seem to be toooo big, I will check my solder , ground, and layer first.

Thanks.
  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
Choke rating for choke input duty cbutterworth Tubes / Valves 14 9th November 2007 04:43 PM
speaker level input vs line level question crippledchicken Subwoofers 4 17th July 2007 03:36 AM
input capacitor ripple current rating for push-pull zilog Power Supplies 3 28th February 2007 10:08 AM
Input level croccodillo Tubes / Valves 3 25th July 2006 09:28 AM
Resistor-Input vs. Choke-Input vs. Cap.Multip. Blitz Pass Labs 13 26th September 2003 04:59 AM


New To Site? Need Help?

All times are GMT. The time now is 09:00 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