LPB1 or LPB2 

Applications and Mods
    From: www.generalguitargadgets.com
Revision: 2007/03/11

General Information
-------------------

The schematic link shows the transistor (Q1) as 2N5133 and notes that a
BC239 was also used.  My original LPB1, purchased in the mid '70's has a
2N5088 transistor in it.  I recommend using a 2N5089 or 2N5088, since they
are low noise and readily available.


Gain Changing Modifications
---------------------------
The overall gain characteristics of this circuit can be tweeked by changing the
value of the resistor connecting from the emitter to ground (390 ohm value
resistor in the schematic).



Tone Changing Modifications
---------------------------

This layout can be used to create a "Screaming Bird" by simply substituting
the 0.1uF capacitors with 0.002uF capacitors.  The schematic is directly 
below the LPB1 schematic on the schematic link.  I've never heard any kind 
words about The Screaming Bird or Screaming Tree. As Art Thompson says, 
the Screaming Tree "Should have been called The Sceaming Audience"!  Yeow, 
I think these treble boosters are pretty harsh to most ears.  Maybe you 
could try something in between the 0.1uF and 0.002uF value for milder treble 
boost.  Brian Tremblay reported that 0.01uF caps worked well for a treble 
boost without being too ear piercing.


Copyright 2007  JD Sleep
Guitar Guitar Gadgets @ ttp://www.generalguitargadgets.com