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Black Magic 20w tube amp problems

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MRHP

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SILVER-7t

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Location: Buzzard Creek Ky

Post Mon Jul 08, 2013 7:13 pm

Black Magic 20w tube amp problems

One of my 20w per/ch black magic has a problem.

In mono mode the swich on the rear has to be set in the stereo mode. Also have to use the right channel rca plug in and speaker plug ins. This is opposite to the instruction manual. It work perfectly fine if setup this way for mono block application.

In stereo mode it plays the right channel thru both speakers.

Any ideas??? I might send it to the Toms if they think it can be fixed by Carverfest.
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Snoop65

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Post Mon Jul 08, 2013 7:41 pm

Re: Black Magic 20w tube amp problems

Sounds like the stereo/mono switch is backward. When you switch it to stereo it's really running mono.
CARVER LIGHTSTAR REFERENCE+SUNFIRE CLASSIC TUBE PREAMPLIFIER+JBL XPL200+MUSIC HALL MMF-9.1+GRADO REFERENCE MASTER 1+CARVER SD/A 390t=WOW!!!!!!
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mbskeam

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Post Mon Jul 08, 2013 9:10 pm

Re: Black Magic 20w tube amp problems

ummm, carverfest, we can fix it....
Mbskeam


#1 BLACK BEAUTY's made by the man, the myth, the legend Bob Carver
CARVER: TFM-75, TFM-45(3), SD/A-490T
SUNFIRE: Tube pre
2 sets of ALS'3, set of SILVERS, set of PLATS
AUDIOCONTROL: phase coupled activator
KENWOOD: BASIC M2a (2)

“Youth ages, immaturity is outgrown, ignorance can be educated, and drunkenness sobered, but stupid lasts forever.”
― Aristophanes

The only thing I'll feel......will be the RECOIL
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MRHP

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Post Tue Jul 09, 2013 12:40 pm

Re: Black Magic 20w tube amp problems

Decisions, decisions..... :-k

Send to a qualified amp repair business...
....or....
Bring to Carverfest and let a bunch of either drunk or hungover friends work on it.....

Think Ill go with Carverfest \:D/ \:D/
TFM-75 serial #0001
PT-2400 serial #0001
Baby Black serial #0001
Baby Black serial #0002
Bone Stock Lightstar
Vintage Hi-Fi modified Lightstar
Cherry/260's
Carver 490t
Sunfire Tube preamp
ProJect TT Tube preamp
DENON DP-62L TurnTable
DQ-20's
Douglas Cables
More Douglas cables
OK ERIC, LET GO OF THE MOUSE AND BACK AWAY FROM YOUR PC WITH YOUR HANDS IN THE AIR. NOW SLOWLY LAY FACE DOWN ON THE FLOOR!!!! - Snoop65
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frankieD

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Post Tue Jul 09, 2013 1:45 pm

Re: Black Magic 20w tube amp problems

MRHP wrote:Decisions, decisions..... :-k

Send to a qualified amp repair business...
....or....
Bring to Carverfest and let a bunch of either drunk or hungover friends work on it.....

Think Ill go with Carverfest \:D/ \:D/




A wise choice Obiwan.
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kingman

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Post Tue Jul 09, 2013 3:16 pm

Re: Black Magic 20w tube amp problems

Bring to Carverfest and let a bunch of either drunk or hungover friends work on it.....
We do some of our best work that way!!!!! :lol:
In reality, it only matters what it sounds like to YOU!!!
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MRHP

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Post Tue Jul 09, 2013 5:15 pm

Re: Black Magic 20w tube amp problems

Sounds like fun guys....lets do this!!!! \:D/ \:D/ \:D/
TFM-75 serial #0001
PT-2400 serial #0001
Baby Black serial #0001
Baby Black serial #0002
Bone Stock Lightstar
Vintage Hi-Fi modified Lightstar
Cherry/260's
Carver 490t
Sunfire Tube preamp
ProJect TT Tube preamp
DENON DP-62L TurnTable
DQ-20's
Douglas Cables
More Douglas cables
OK ERIC, LET GO OF THE MOUSE AND BACK AWAY FROM YOUR PC WITH YOUR HANDS IN THE AIR. NOW SLOWLY LAY FACE DOWN ON THE FLOOR!!!! - Snoop65
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BrianT

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Post Tue Jul 09, 2013 5:34 pm

Re: Black Magic 20w tube amp problems

MRHP wrote:Decisions, decisions..... :-k

Send to a qualified amp repair business...
....or....
Bring to Carverfest and let a bunch of either drunk or hungover friends work on it.....

Think Ill go with Carverfest \:D/ \:D/


Eric.
Real good choice, so much knowledge at Carverfest
you might be lucky and get Bob working on it
like I did with my Silver Seven's

Brian
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mbskeam

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Location: Woodinville Wa

Post Tue Jul 09, 2013 8:26 pm

Re: Black Magic 20w tube amp problems

I wonder if the switch is just upside down, in regards to the mono/stereo tag
Mbskeam


#1 BLACK BEAUTY's made by the man, the myth, the legend Bob Carver
CARVER: TFM-75, TFM-45(3), SD/A-490T
SUNFIRE: Tube pre
2 sets of ALS'3, set of SILVERS, set of PLATS
AUDIOCONTROL: phase coupled activator
KENWOOD: BASIC M2a (2)

“Youth ages, immaturity is outgrown, ignorance can be educated, and drunkenness sobered, but stupid lasts forever.”
― Aristophanes

The only thing I'll feel......will be the RECOIL
Necronomicon Ex-Mortis....... Klaatu Barada Nikkto
"We should seek the greatest value of our action"
<<

Snoop65

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Post Tue Jul 09, 2013 8:58 pm

Re: Black Magic 20w tube amp problems

MRHP wrote:Decisions, decisions..... :-k

Send to a qualified amp repair business...
....or....
Bring to Carverfest and let a bunch of either drunk or hungover friends work on it.....

Think Ill go with Carverfest \:D/ \:D/

:lol: :lol: :lol: :lol: :lol: :lol:
CARVER LIGHTSTAR REFERENCE+SUNFIRE CLASSIC TUBE PREAMPLIFIER+JBL XPL200+MUSIC HALL MMF-9.1+GRADO REFERENCE MASTER 1+CARVER SD/A 390t=WOW!!!!!!
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MRHP

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Location: Buzzard Creek Ky

Post Tue Jul 09, 2013 10:29 pm

Re: Black Magic 20w tube amp problems

May have found the problem. The mono/stereo switch is definately wired backward compared to my other amp whick doenst really bother me. But we definately have a loose wire thats supposed to go to the left rca input.
DSC00068.JPG
Notice the little red box(mono/stereo switch), the wires are opposite each other.
DSC00068.JPG (61.27 KiB) Viewed 1499 times

DSC00071.JPG
White wire not connected to the left rca inpt when I opened her up.
DSC00071.JPG (60.62 KiB) Viewed 1499 times
TFM-75 serial #0001
PT-2400 serial #0001
Baby Black serial #0001
Baby Black serial #0002
Bone Stock Lightstar
Vintage Hi-Fi modified Lightstar
Cherry/260's
Carver 490t
Sunfire Tube preamp
ProJect TT Tube preamp
DENON DP-62L TurnTable
DQ-20's
Douglas Cables
More Douglas cables
OK ERIC, LET GO OF THE MOUSE AND BACK AWAY FROM YOUR PC WITH YOUR HANDS IN THE AIR. NOW SLOWLY LAY FACE DOWN ON THE FLOOR!!!! - Snoop65
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TNRabbit

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Post Wed Jul 10, 2013 2:10 am

Re: Black Magic 20w tube amp problems

I wonder if the workmanship will get any better with Emotiva at the reins. ...
TNRabbit
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MRHP

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Post Wed Jul 10, 2013 7:48 am

Re: Black Magic 20w tube amp problems

TNRabbit wrote:I wonder if the workmanship will get any better with Emotiva at the reins. ...


My amp probably built during their two week trial period before they took over :lol: :lol: :lol:
TFM-75 serial #0001
PT-2400 serial #0001
Baby Black serial #0001
Baby Black serial #0002
Bone Stock Lightstar
Vintage Hi-Fi modified Lightstar
Cherry/260's
Carver 490t
Sunfire Tube preamp
ProJect TT Tube preamp
DENON DP-62L TurnTable
DQ-20's
Douglas Cables
More Douglas cables
OK ERIC, LET GO OF THE MOUSE AND BACK AWAY FROM YOUR PC WITH YOUR HANDS IN THE AIR. NOW SLOWLY LAY FACE DOWN ON THE FLOOR!!!! - Snoop65
<<

Don

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Post Wed Jul 10, 2013 7:59 am

Re: Black Magic 20w tube amp problems

Good eye Eric. =D> Looks like I won't have to bring my soldering iron now and run the risk of burning myself or setting the place on fire! :rolleyes: :lol:
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RIP Bill D.
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MRHP

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Location: Buzzard Creek Ky

Post Wed Jul 10, 2013 8:19 am

Re: Black Magic 20w tube amp problems

Don wrote:Good eye Eric. =D> Looks like I won't have to bring my soldering iron now and run the risk of burning myself or setting the place on fire! :rolleyes: :lol:


Hey bring it just in case...theres no telling what Ill tear up between now and then...LOL In case of fire we can do the soldering at your cabin :lol: :lol:
TFM-75 serial #0001
PT-2400 serial #0001
Baby Black serial #0001
Baby Black serial #0002
Bone Stock Lightstar
Vintage Hi-Fi modified Lightstar
Cherry/260's
Carver 490t
Sunfire Tube preamp
ProJect TT Tube preamp
DENON DP-62L TurnTable
DQ-20's
Douglas Cables
More Douglas cables
OK ERIC, LET GO OF THE MOUSE AND BACK AWAY FROM YOUR PC WITH YOUR HANDS IN THE AIR. NOW SLOWLY LAY FACE DOWN ON THE FLOOR!!!! - Snoop65
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