Strange crackle in my Rega Mira - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 26th March 2013, 10:29 PM   #1
diyAudio Member
mashley_nad's Avatar
Join Date: Apr 2009
Default Strange crackle in my Rega Mira

Hoping someone can help with this ...

I have an old but much loved Rega Mira clamshell amp, used daily for years.

Yesterday I noticed that the volume seemed a bit weaker than usual, and there was a definite crackling, sometimes almost like a buzz in the right channel that seemed to coincide with peaks of volume.

I established it was not the speaker; then this morning, it appears in both channels. The sound is also slightly distorted as well.

I ran another power amp off the Rega's pre-amp out sockets, and that sounds fine, so the problem is with the Mira's power amps.

Anyone experienced something similar? Any clues as to what is wrong???
NAD: C730, C541i; 7100, 5000; Rega (clamshell): Mira, Planet, Radio R; Denon: DR-M14HX
  Reply With Quote
Old 26th March 2013, 10:41 PM   #2
diyAudio Member
vacuphile's Avatar
Join Date: Apr 2011
Location: Not where whatever I am looking for is at.
One or more elco's may be giving up the gost, I would first look at the PS. If the Rega's preamp has a regulated PS, it might not be affected, but the power stage would be.
Everything is somewhere. Where the @!#$ is it.

Last edited by vacuphile; 26th March 2013 at 10:44 PM.
  Reply With Quote
Old 27th March 2013, 12:01 AM   #3
diyAudio Member
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Send a message via Skype™ to JonSnell Electronic
Try cleaning or replacing the volume control.
  Reply With Quote
Old 27th March 2013, 01:17 AM   #4
diyAudio Member
mashley_nad's Avatar
Join Date: Apr 2009
Thanks for the tips folks. Volume control operates smoothly and is before the pre-amp out, so that cannot be the problem; but the pre-amp and driver stages do have separate regulated power supply ... so I'll check power amp power supply first.
NAD: C730, C541i; 7100, 5000; Rega (clamshell): Mira, Planet, Radio R; Denon: DR-M14HX
  Reply With Quote
Old 27th March 2013, 01:36 AM   #5
eyoung is offline eyoung  United States
diyAudio Member
eyoung's Avatar
Join Date: Aug 2007
Location: Sunny SC,USA 15 min south of Charlotte NC
Hola Y'all...

I'm afraid Mr. Vacuphile may be heading in the right direction more than likely weak electrolytic caps they get noisey when aged get a schematic and lets see whats in that bugger...

Regards, E
"Lead me not into temptation...I can find it myself."
  Reply With Quote
Old 31st March 2013, 11:55 AM   #6
diyAudio Member
mashley_nad's Avatar
Join Date: Apr 2009

Turns out my initial diagnosis was wrong. Only the left channel is a problem; and it is only the power amp.

Not a power supply issue: both power amps share the same power supply.

Have checked various voltages around the circuit to compare left with right; and no differences at all.

Any thoughts?
NAD: C730, C541i; 7100, 5000; Rega (clamshell): Mira, Planet, Radio R; Denon: DR-M14HX
  Reply With Quote
Old 10th January 2014, 02:35 PM   #7
diyAudio Member
Join Date: Jan 2014
Default Same thing


I have a problem with my mira that sounds extremely like the one described by you. I open the mira and touched the shaft of the alps input selector. This way I can reproduce the crackle on one channel. The other channel is ok.

Maybe it is the same for your circuit.
I sended the mira to rega several times for repair, but the didn't fix the problem. So I want to fix it myself. Does anyone know where to get the spareparts?

best regards,
  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
Rega Mira 3 schematic Polesov Solid State 20 27th September 2012 09:30 AM
Rega Mira, circa year 2000, HELP!!!! 110jim Solid State 3 10th April 2012 03:22 PM
Rega Mira Clamshell ~ circuit required mashley_nad Solid State 3 27th March 2012 11:56 AM
Idling current in Rega Mira 1, 2 or 3 2N6658 Solid State 5 17th March 2012 04:05 AM
Rega Mira 3 missing power-amp inputs dynaudio_tube Solid State 3 29th November 2011 11:33 PM

New To Site? Need Help?

All times are GMT. The time now is 04:06 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