AudioAficionado.org  

Go Back   AudioAficionado.org > Manufacturers Forums > Bryston Audio

Bryston Audio Unlimited, Unprecedented, Unequalled

Reply
 
Thread Tools Display Modes
  #1  
Old 11-03-2017, 10:39 AM
Stefan_DR3's Avatar
Stefan_DR3 Stefan_DR3 is offline
Member
 
Join Date: Jun 2012
Location: Ontario, Canada
Posts: 228
Default BP17 Cubed phono + TF2 step-up

Hi folks,
My new TF2-20 arrived home last night. When connected to my preamp's phono input with both RCA cables there is a nasty hum. When one or both of the cables is removed the hum goes away but there is still a bit of noise. The ground terminal on the TF2 has no effect.

When the turntable is connected directly to the preamp it is dead silent.

Any ideas?
Reply With Quote
  #2  
Old 11-03-2017, 10:53 AM
PHC1 PHC1 is offline
Guest
 
Join Date: Apr 2009
Location: Pa
Posts: 23,609
Default

Try running a ground cable from TT to SUT and from SUT to Preamp.
Reply With Quote
  #3  
Old 11-03-2017, 11:55 PM
Stefan_DR3's Avatar
Stefan_DR3 Stefan_DR3 is offline
Member
 
Join Date: Jun 2012
Location: Ontario, Canada
Posts: 228
Default

I did that and the noise got worse!
Reply With Quote
  #4  
Old 11-04-2017, 11:02 AM
PHC1 PHC1 is offline
Guest
 
Join Date: Apr 2009
Location: Pa
Posts: 23,609
Default

Try moving the SUT around the rack and away from other wires and components
Reply With Quote
  #5  
Old 11-05-2017, 02:40 PM
Stefan_DR3's Avatar
Stefan_DR3 Stefan_DR3 is offline
Member
 
Join Date: Jun 2012
Location: Ontario, Canada
Posts: 228
Default BP17 Cubed phono + TF2 step-up

There is no difference in noise if I put the SUT directly on top of my 7B or four feet away.

Thank you for the suggestions though.

Last edited by Stefan_DR3; 11-06-2017 at 12:58 AM.
Reply With Quote
  #6  
Old 11-05-2017, 02:46 PM
PHC1 PHC1 is offline
Guest
 
Join Date: Apr 2009
Location: Pa
Posts: 23,609
Default

Quote:
Originally Posted by Stefan_DR3 View Post
There is no difference in noise if I put the SUT directly on top of my 7B or two feet away.

Thank you for the suggestions though.
If you have exhausted all the possible grounding schemes to no avail, I'm sure if you reach out to Bryston they will be able to help.
Reply With Quote
  #7  
Old 11-05-2017, 03:33 PM
dantes0929's Avatar
dantes0929 dantes0929 is offline
Member
 
Join Date: Mar 2013
Location: LA
Posts: 401
Default

Remove any LED lights in that room connected in to your AC outlets!
Reply With Quote
  #8  
Old 11-06-2017, 01:07 AM
Stefan_DR3's Avatar
Stefan_DR3 Stefan_DR3 is offline
Member
 
Join Date: Jun 2012
Location: Ontario, Canada
Posts: 228
Default

Removed all lights and other stereo components, no change.

It's very odd. The hum is always there but only when the TF2 is connected to the preamp. Grounding them together makes the noise 3 times louder.

Bryston tech support is looking into it.

Last edited by Stefan_DR3; 11-09-2017 at 01:13 PM.
Reply With Quote
  #9  
Old 11-09-2017, 01:13 PM
Stefan_DR3's Avatar
Stefan_DR3 Stefan_DR3 is offline
Member
 
Join Date: Jun 2012
Location: Ontario, Canada
Posts: 228
Default

TF2 works fine on my Yamaha receiver phono input. So the BP17 phono stage is now the prime suspect.
Reply With Quote
  #10  
Old 12-10-2017, 06:14 PM
Stefan_DR3's Avatar
Stefan_DR3 Stefan_DR3 is offline
Member
 
Join Date: Jun 2012
Location: Ontario, Canada
Posts: 228
Default

Update: Bryston is looking at a grounding fix within the TF-2

I still think I have a bad phono board but willing to ship either or both units back. Just waiting for confirmation and RMA...

Anyone else have this setup?
Reply With Quote
Reply

Thread Tools
Display Modes

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

Audioaficionado.org tested by Norton Internet Security

All times are GMT -4. The time now is 10:34 AM.



Powered by vBulletin® Version 3.8.10
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
©Copyright 2009-2023 AudioAficionado.org.Privately owned, All Rights Reserved.
Audio Aficionado Sponsors
AudioAficionado Subscriber
AudioAficionado Subscriber
Inspire By Dennis Had
Inspire By Dennis Had
Harmonic Resolution Systems
Harmonic Resolution Systems
Wyred4Sound
Wyred4Sound
Dragonfire Acoustics
Dragonfire Acoustics
GIK Acoustics
GIK Acoustics
Esoteric
Esoteric
AC Infinity
AC Infinity
JL Audio
JL Audio
Add Powr
Add Powr
Accuphase - Soulution
Accuphase - Soulution
Audio by E
Audio by E
Canton
Canton
Bryston
Bryston
WireWorld Cables
WireWorld Cables
Stillpoints
Stillpoints
Bricasti Design
Bricasti Design
Furutech
Furutech
Shunyata Research
Shunyata Research
Legend Audio & Video
Legend Audio & Video