Trinity Amps Trinity Tweed Amp, Builder'S Manual

Page: 11 / 77

Version 3.2 Page: 11
The Fender circuit also has the unusual side effect that if all controls are set to 0, then no
sound is produced at all. The Marshall design avoids this, but the tone with all controls set
to 0 is not something you'd be likely to use anyway.
Here are the same charts for Marshall tone controls. As mentioned already, the main points
to note are the smaller range of adjustment, the higher frequency for the middle cut control,
and the higher overall signal level. The smaller adjustment range and higher level are both
caused by the use of the 33K resistor in place of Fender's 100K. The also gives the tone
stack a lower input impedance, requiring it to be fed from a lower output impedance
(cathode follower) preamp tube stage.