Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Please don't until you check up the schematic of the amp !

Posted by cheap-Jack (M) on June 29, 2007 at 08:08:48

In Reply to: Removing the input caps from my SS amp. How to do it?? posted by RauSen on June 28, 2007 at 12:56:29:

Hi.

If there is a volume control in the power amp & the I/P coupling cap hooked up directly to the volume pot. Chances are you can bypass it.

But if there is no volume control in your amp & the I/P cap is (usually) hooked up direct to the I/P terminal of the SS device where DC bias exists, don't be a smart ass to bypass it. This will upset the DC bias of the I/P SS device, say a bi-polar transistor, & cause distortion.

The I/P coupling cap also serves as DC blocker against any DC offset flowing into the power amp from the preceeding component.

For most transistor power amps, the I/P coupling cap also serves as a subsonic low frequency filter & helps to stabilize the entire direct coupling operation of the power amp. Removing it can cause transient
instability of the power amp, resulting possble blowing the power amp.

Why you want to bypass the I/P cap anyway?

c-J

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