ZenV2 Hum - 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 13th June 2003, 06:16 PM   #1
diyAudio Member
 
Shoog's Avatar
 
Join Date: Aug 2002
Location: Eire
Default ZenV2 Hum

My zen Vol2 sounds great but it has a slight hum problem. When you switch on and for about a hour or so afterwards there is no hum, then slowly the hum creeps in till its noticable from the other side of the room.
I have a big 24V toroidal followed by bridge, 10,000uf of cap, a cap multiplier and finally two x 22,000uf of cap. The two channels work off the same supply. The power supply is unshielded (apart from a sheet of lead over it), and sits between the two channels.
I have a hunch that it is the transformer warming up and starting to hum more. Also the caps are top quality slavaged.
Any ideas !!!!

Shoog
  Reply With Quote
Old 13th June 2003, 06:18 PM   #2
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Is it mechanical hum from the transformer?
  Reply With Quote
Old 13th June 2003, 06:21 PM   #3
diyAudio Member
 
Shoog's Avatar
 
Join Date: Aug 2002
Location: Eire
No sorry, i'am talking about hum from my high efficiency speakers.

Shoog
  Reply With Quote
Old 13th June 2003, 07:26 PM   #4
diyAudio Member
 
Join Date: Dec 2002
Location: Houston
Default Humm

Quote:
Originally posted by Shoog
No sorry, i'am talking about hum from my high efficiency speakers.

Shoog
Shoog,
I suspect you have a grounding issue. I built mine with a 10K cap, 2.7 mH choke, and 10K cap. My transformer is a 300 watt 38 volt Plintron, and it and the two chokes are inbetween the circuit boards. I was concerned about radiated hum.
But it is dead quiet. On my Lowthers (100 db) speakers you cannot tell if the amp is on. I put output switches because I was worried about turn on and off thumps. But it was quiet on power up and down to boot.
The grounding really does not explain the warm up effects, but I am listening to an Aleph X that hums a little. It is worse for the first 20 - 30 minutes and then the hum level decreases. I have no idea why.

George
  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
Single Tranformer for ZenV2 Shoog Solid State 0 19th November 2002 06:49 PM
Help upgrading ZenV2 to ZenV4 df Pass Labs 3 21st October 2002 08:17 PM


New To Site? Need Help?

All times are GMT. The time now is 10:40 AM.


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