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lpd 5th March 2008 04:21 AM

Bogen Front End
I'm looking for some ideas for the front end on a Bogen MO-100A conversion.

I'm rebuilding power supply, converting to EL34 output tubes, but not sure about the 7247 input tube. Any suggestions for a decent input driver stage?

Here's the schematic....



jon_010101 5th March 2008 05:10 AM

Hopefully bricktop will find this thread ... I sold him my old MO-200, and he redid it with a 6CL6 differential amp front-end. After tuning the global feedback, he got some great square waves and very low distortion.

lpd 5th March 2008 05:12 AM

Yep, seen the schematic and consulted him on his build. 6CL6's aren't that easy to find here though. Just thought about trying a more common tube ie: 6DJ8 ect.

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