Outboard Valhalla ? - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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
Thread Tools Search this Thread
Old 14th March 2010, 01:24 AM   #1
diyAudio Member
Join Date: Feb 2010
Default Outboard Valhalla ?

I would like to try mounting a Valhalla in a outboard box and seeing if this deals with some of the humm pickup I'm experiencing with a Grado cart on inner groves on my Linn LP-12 ?
Anybody tried this and was there any reduction in humm pickup as a result ? And yes - it probably would be easier/faster/cheaper to go to another cart line that doesn't have this problem - but I do really like the sound of the cheap Grado's !
  Reply With Quote
Old 14th March 2010, 08:00 AM   #2
diyAudio Member
analog_sa's Avatar
Join Date: Aug 2002
Location: Cascais
The Valhalla radiates some RF but compared to the motor and wiring it simply has no ability to radiate hum. Whatever benefits you experience from externalising the board, hum reduction probably won't be one of them. Do you love cheap Grados enough to go for a dc motor?
  Reply With Quote
Old 14th March 2010, 03:57 PM   #3
diyAudio Member
Join Date: Feb 2010
Default Maybe DC

I've looked into the Origin Live DC motor setups - may eventually go that route. But scrounged up what appears to be a brand new Valhalla board that I would like to try out and my very old and heavily modded LP-12 is not a confortable fit for the V board -so will probably outboard it in any case.
  Reply With Quote
Old 17th March 2010, 05:53 PM   #4
diyAudio Member
Join Date: Jun 2004
Location: sheffield
Send a message via MSN to sq225917 Send a message via Skype™ to sq225917
offboard the Valhalla and wrap the motor in Mu-metal, even with my MC cart the effect was a few db reduction in noise at multiples of the mains frequencies, about 3db at 50hz decreasing to about -.3db at 450hz.

Definitely a worthwhile job, and Mu-metal is only about $20 for a 6 inch square sheet.
Paradise Pre-reg PSU PCBs
  Reply With Quote
Old 20th March 2010, 02:48 AM   #5
diyAudio Member
Join Date: Feb 2010
Default surprising result

Since in the best audiophile tradition - I made at least three signifigant changes - not at all sure what worked. BUT - the final result is that I haven't got ANY hum now with the Grado. Here's what i did: substituted 50hz/110 V new motor and pulley for very old 50/60 hz motor with 60 Hz pulley- left switch to fill hole - removed the power cord and the rest of the 60Hz stuff , installed a later Valhalla board (diode mod on board) in a separate chassis with Valhalla power switch. Other than initially getting nothing to work ( had inserted ribbon cable upside down ) - this just got up and ran. The surprise was that for some reason or other - I have NO hum at all now with the Grado Prestige Blue in a Rega RB-600 on this modded LP-12. Previously I was getting low level hum on the inner groves -dead silent now.
Somehow I doubt that this is a result of remoting the Valhalla ( lots of folks would be doing this already if this were really effective) - anybody know if these newer Linn motors have lots less hum field ?
Thanks to Rick at Audio Alternative for coming up with the parts i needed.
  Reply With Quote


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
Need help with linn Valhalla repair ericpeters Analogue Source 38 25th January 2017 02:55 AM
Linn Valhalla 6072a Analogue Source 8 21st December 2016 09:32 AM
Two speed Valhalla tkwou Analogue Source 132 18th March 2014 09:26 AM

New To Site? Need Help?

All times are GMT. The time now is 02:35 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2