Foreplay III Tone Control

[bainjs]

For older/worn LPs that don't quite sound like they used to, I decided to try building a simple tone control for my Foreplay III to boost the treble a little.  Having 55+ old ears probably contributes to the lack of highs as well...

I included a bypass switch to add the control as needed.  A drawback is that the output of the Foreplay is lowered by about a third (added impedance?) when the circuit is active, though it's still fills the room using a S.E.X. as my main amp.

Joel

 

[Grainger49]

True Bottlehead experimentation! 

Congratulations on a nice build.  Is it functioning as you expected?

 

[bainjs]

Grainger:

Yes, it works quite well.  Cymbals go sssss instead of shhhhh now. We played an old Moody Blues last night I've had since I was 14 (ceramic cartridge era!) and it helped it alot.  Carlene approves.

Did you get my PMs about the Ampzilla?

Joel

 

[pboser]

Looks nice! Can you post the schematic?
Thanks,
Pete

 

[bainjs]

Here's the link - http://www.angelfire.com/electronic/funwithtubes/Amp-Tone-A.html

The one I used is figure 9.

Joel