New Posts New Posts RSS Feed - Occasional hum
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Welcome to the Graham Slee Audio Products Owners Forum

 

Open to all owners plus those contemplating the purchase of a Graham Slee HiFi System Components audio product and wishing to use this forum's loaner program: join here (Rules on posting can be found here)

This website along with trade marks Graham Slee and HiFi System Components are owned by Cadman Enterprises Ltd

Occasional hum
 Post Reply Post Reply Page  <1234 10>
Author
  Topic Search Topic Search  Topic Options Topic Options
Graham Slee View Drop Down
Admin Group
Admin Group
Avatar
Retired

Joined: 11 Jan 2008
Location: South Yorkshire
Status: Online
Points: 16041 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 2023 at 11:10am
Originally posted by RichW RichW wrote:

DC on the mains, or asymmetrical AC mains is reported to make transformers buzz.
I used to hear this intermittently but now rarely for an unknown reason..
A DC blocker might be worth a trial.

Hi Richard, I think he's got one of those in his power amp.
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
Back to Top
CageyH View Drop Down
Senior Member
Senior Member
Avatar

Joined: 30 Apr 2012
Location: Toulouse, Franc
Status: Offline
Points: 1598 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CageyH Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 2023 at 1:04pm
Originally posted by RichW RichW wrote:

DC on the mains, or asymmetrical AC mains is reported to make transformers buzz.
I used to hear this intermittently but now rarely for an unknown reason..
A DC blocker might be worth a trial.

Thanks Rich, unfortunately it is not transformer buzz. I built and fitted a DC blocker into my amplifier.
The buzz can be heard through the speakers/headphones and only lasts 1 or 2 seconds, so could be a fridge or something else turning on/off.
Kevin
European loan coordinator, based near Toulouse, France.
Back to Top
BackinBlack View Drop Down
Senior Member
Senior Member
Avatar

Joined: 05 Feb 2012
Location: Hinton, N'hants
Status: Offline
Points: 1973 		Post Options Post Options   Thanks (1) Thanks(1)   Quote BackinBlack Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 2023 at 4:41pm
I can't imagine you haven't considered mobile phone interference. I have occasionally noticed intrusions from my phone a it keeps "in touch" with the network. Most often when the local mast is not available due to reaching max capacity or maintenance and the phone has to increase signal strength.
Just a thought.

Ian
Just listen, if it sounds good to you, enjoy it.
Back to Top
gwebster View Drop Down
Senior Member
Senior Member


Joined: 04 Oct 2014
Location: Liss, UK
Status: Offline
Points: 175 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gwebster Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 2023 at 5:05pm
Originally posted by CageyH CageyH wrote:

The buzz can be heard through the speakers/headphones and only lasts 1 or 2 seconds, so could be a fridge or something else turning on/off.
Possibilities:
  • fridge
  • freezer
  • air-con
  • heat pump
Inspire Apollo tt, O/L modded RB250, Ortofon 2M Black, Slee Different Approach inspired Phono, Putzeys Pre, Cusat, Raspberry Pi/Volumio, Bitzie, Self Load Invariant Power, Acoustic Energy AE509s
Back to Top
CageyH View Drop Down
Senior Member
Senior Member
Avatar

Joined: 30 Apr 2012
Location: Toulouse, Franc
Status: Offline
Points: 1598 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CageyH Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 2023 at 5:19pm
Originally posted by gwebster gwebster wrote:

Originally posted by CageyH CageyH wrote:

The buzz can be heard through the speakers/headphones and only lasts 1 or 2 seconds, so could be a fridge or something else turning on/off.
Possibilities:
  • fridge
  • freezer
  • air-con
  • heat pump

You are correct, but I don't want to turn any of those off!
Having a fridge/freezer, a fridge and a freezer in the house makes this a challenge.
Soon I can see if it is the heat pump, as I will be able to turn the heating off soon - hopefully!
Kevin
European loan coordinator, based near Toulouse, France.
Back to Top
patientot View Drop Down
Senior Member
Senior Member


Joined: 28 Nov 2018
Location: USA
Status: Offline
Points: 1411 		Post Options Post Options   Thanks (0) Thanks(0)   Quote patientot Quote  Post ReplyReply Direct Link To This Post Posted: 08 Mar 2023 at 5:21pm
No advice but I wish you luck in sorting this out. Problems like this can be very annoying.
Reflex M + PSU-1 used with AT150-40ML, AT VM95ML, Stanton 680mkII + Ogura, and Shure M35X cartridges.
Back to Top
CageyH View Drop Down
Senior Member
Senior Member
Avatar

Joined: 30 Apr 2012
Location: Toulouse, Franc
Status: Offline
Points: 1598 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CageyH Quote  Post ReplyReply Direct Link To This Post Posted: 08 Mar 2023 at 5:22pm
New discovery tonight - It is only on the analogue side of my system, so not likely to be a mains issue?
Makes me wonder if it is RFI or EMI now.

The digital side uses USB/coax into an Audio GD DI2014, which feeds the DAC via another coax cable. Connections between the DAC, Preamp and amplifier are all balanced.

On the analogue side, I use coax interconnects cables from SL1200 into the BB3, core for signal and shield as return, and a “balanced” RCA cable with the screen connected at the source end only, going from BB3 to Pre.

I think my money is on the last cable being the “problem child.”

The expertly made cables in this house have just left for a loan, so I will have to try one of my “CageySat” cables between the Phonostage and preamp.
Kevin
European loan coordinator, based near Toulouse, France.
Back to Top
 Post Reply Post Reply Page  <1234 10>
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.219 seconds.