Randall MTS - changing a bright switch into a gain switch

This ones pretty simple if your module has the appropriate circuit board.  If your module board has a designation of MODU_1-0 then you're all set.  Here's what to do:

  • remove C1 (this is the bright boost cap);
  • remove R8 (this resistor prevents an annoying pop when switching the bright switch);
  • add an appropriate sized resistor into R23 - you can start with something like 47k.  The lower the value, the less gain there will be in the low gain (switch to the left) setting.

Explaination

The resistor in R23 works as a "grid leak" or "grid load" resistor in the coupling circuitry between V1B and V1A.  It provides a path for signal to ground.  The lower the resistance, the greater the signal path to ground and the more gain attenuation occurs with the switch to the left.  With the switch to the right, R23 is switched out of the circuit.

Related articles:

Randall MTS module fault finding

Tubes

Randall MTS 1086 Dan Donegan signature module

Great super-tight sounding high gain module without any of the flubby bottom end or top end fizz that some of the other stock high gain modules have.  Definitely my favourite module straight out of the box.

BMX to MTB conversion - Redline Mini

When I was looking for a "real" kids bike about 5 years ago It came across a closeout sale on Redline Mini Pro LE BMX bike. I was light and equipped with good solid components.

Touring with the tandem and bob trailer

Did my first offroad bike tour with the tandem and the bob trailer. Was just a quick overnighter. Tandem tows the bob trailer really well. The long wheelbase of the tandem and the extra weight of two ...

Randall MTS Brahma module

Randall described the module as follows:

Saving weight with lighter spokes

There's two ways to go in terms of saving weight with spokes:

Content-type: text/html Error
Sorry, the application you are using has encountered an error.

Please click on this link to report the error: REPORT ERROR