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Technical question on adding preamp...

Posted by RGA (R) on June 18, 2015 at 17:40:07

I have a dual mono SET integrated amp in the Line Magnetic 219IA.

This integrated has preamp in so it can be used a dual monoblock power amp.

The tubes are
2 X 12AX7 preamp stage
2 X 310A (dual driver stage)
2 X 300B (dual driver stage)
2 X 845 (output)

Someone mentioned that if you add a preamp to this the audio signal still passes through the 12AX7 preamp stage making the tubes placed here still important. I would have thought that the added preamp would bypass this stage sonically.

I tried out three preamps at the same volume and all three made rather significant changes to the sound without a hint of noise so I assumed it just side-stepped the integrated amp's preamp stage.

If someone can explain what happens when the preamp is connected and the switch is flipped that would be great

Thanks.

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