TK2050 Phono Trouble

sled108 · 11:49 PM

For a while now, but not always, my Sure TK2050 has a Problem with LP's...At first I thought that it was my Tube Phono Stage having a Problem with the Chip Preamp. When the Vol. hits a certain Point, around 11:00 it Oscillates, then the Amp will Cut Out and turn off... So, I ran it right into the TK2050 and used the Phono's Vol. Knobs..Same Thing...Next, I just tried a VSPS into the Pre, and the same thing happened. I have to conclude that it's not a Tube Thing, a Chip Phono Stage thing, or a PreAmp Thing...So what is It? At one time I could use Both of these Phono's up to 1:00 before the Amp would Shut Down in the Regular Way, No Oscillation..
And Also, the Amp will Play at Full Tilt Boogie from the FM Input...Does anyone know why this happens?

teamacc · 26th May 2011, 11:55 PM

Does the pre have a big dc-offset?

sled108 · 12:13 AM

No...That was one of first things that I Checked...But just now, the Plot Thickens...I've just ran the Tube Phono into the Marantz 7T's Aux Inputs, and then fed it back into the Chip PreAmp from the Marantz's Headphone Jack....I'm afraid that it will Pop a Woofer now that it's Playing so Strong...No Oscillation now, only 2 Volumes now to deal with... And the TK2050 will get Loud as it ever has....
........I just ran the 7T right into the TK2050...It Sounds Awsome!..

26th May 2011, 11:32 PM	#1
sled108 diyAudio Member Join Date: May 2008 Location: Deep in the Heart of North Jersey	TK2050 Phono Trouble For a while now, but not always, my Sure TK2050 has a Problem with LP's...At first I thought that it was my Tube Phono Stage having a Problem with the Chip Preamp. When the Vol. hits a certain Point, around 11:00 it Oscillates, then the Amp will Cut Out and turn off... So, I ran it right into the TK2050 and used the Phono's Vol. Knobs..Same Thing...Next, I just tried a VSPS into the Pre, and the same thing happened. I have to conclude that it's not a Tube Thing, a Chip Phono Stage thing, or a PreAmp Thing...So what is It? At one time I could use Both of these Phono's up to 1:00 before the Amp would Shut Down in the Regular Way, No Oscillation.. And Also, the Amp will Play at Full Tilt Boogie from the FM Input...Does anyone know why this happens? Last edited by sled108; 26th May 2011 at 11:49 PM.

27th May 2011, 12:06 AM	#3
sled108 diyAudio Member Join Date: May 2008 Location: Deep in the Heart of North Jersey	No...That was one of first things that I Checked...But just now, the Plot Thickens...I've just ran the Tube Phono into the Marantz 7T's Aux Inputs, and then fed it back into the Chip PreAmp from the Marantz's Headphone Jack....I'm afraid that it will Pop a Woofer now that it's Playing so Strong...No Oscillation now, only 2 Volumes now to deal with... And the TK2050 will get Loud as it ever has.... ........I just ran the 7T right into the TK2050...It Sounds Awsome!.. Last edited by sled108; 27th May 2011 at 12:13 AM.

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26th May 2011, 11:55 PM	#2
teamacc diyAudio Member Join Date: Jan 2010	Does the pre have a big dc-offset?

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