Stereo bass problem

Eriksonas · 17th May 2009, 08:59 PM

Hi guys
Well im new here so say if im doing something wrong.

I have a little problem. Recently finished designing a tube amp, built one monoblock, worked perfectly (for my taste), build a second one, worked the same. But as i connect them both to the power supply at once, bass at lower frequencies dissapears.

Is that a design problem?

A power supply problem?

Or some other issue?

Greatly apreciate your help. Should i post the schematic?

astouffer · 17th May 2009, 09:16 PM

Its difficult to say without more details but my advice is to poke around with a meter and see how the voltages compare when one amp is connected or when both are connected.

kevinkr · 17th May 2009, 09:16 PM

More details are needed. Are you sure that your woofers are phased correctly and that you have not swapped connections on the output transformer of one amp relative to the other?

Are these PP amps or SE and do they use global negative feedback or not?

Eriksonas · 18th May 2009, 04:01 PM

So thats why speakers have red and black wires. I rephased one of the speakers and its all fine now.

By the way it's a two SE monoblock amp (6n1p, 6p14p) all made of ex-soviet parts.

Thanks for your help. Got to keep in mind that phasing is essential.

17th May 2009, 08:59 PM	#1
Eriksonas diyAudio Member Join Date: May 2009	Stereo bass problem Hi guys Well im new here so say if im doing something wrong. I have a little problem. Recently finished designing a tube amp, built one monoblock, worked perfectly (for my taste), build a second one, worked the same. But as i connect them both to the power supply at once, bass at lower frequencies dissapears. Is that a design problem? A power supply problem? Or some other issue? Greatly apreciate your help. Should i post the schematic?

17th May 2009, 09:16 PM	#3
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	More details are needed. Are you sure that your woofers are phased correctly and that you have not swapped connections on the output transformer of one amp relative to the other? Are these PP amps or SE and do they use global negative feedback or not? __________________ "Extraordinary claims require extraordinary evidence." - Carl Sagan

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17th May 2009, 09:16 PM	#2
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	Its difficult to say without more details but my advice is to poke around with a meter and see how the voltages compare when one amp is connected or when both are connected.

18th May 2009, 04:01 PM	#4
Eriksonas diyAudio Member Join Date: May 2009	So thats why speakers have red and black wires. I rephased one of the speakers and its all fine now. By the way it's a two SE monoblock amp (6n1p, 6p14p) all made of ex-soviet parts. Thanks for your help. Got to keep in mind that phasing is essential.