Section 1: About This Manual; Who Should Attempt These Projects - DYNACO PAT-4 Assembly Manual

Section 1: About This Manual

This manual gives the information you need to install the phono upgrade to the Dynaco
PAT-4 Preamp. Manuals starting from Rev 2p13 cover the Rev B version of the kit,
which substitutes a 1K resistor for the original 4K7 R1, instead of a jumper. As of this
writing, the following other PAT-4 upgrades are available from Updatemydynaco, a
division of Akitika LLC:
 Blue Light Kit (BLUE)
 Line Amp Distortion Reducer (DRD4)
 Tone Control Switch (TCS)
 Electronically Regulated Power Supply (PAT4PWR)
The blue light kit changes the light in the power switch from original orange to beautiful
blue.
The Line Amp Distortion Reducer drops the distortion of the Line Amp by a factor of
ten. The Line Amp is the stage that includes the volume and tone controls. All sound
from the preamp passes through the Line Amp. This upgrade makes everything played
through the PAT-4 sound better.
The Tone Control Switch replaces the existing Hi Filter switch with a two position rotary
switch. In the OFF position, the tone controls are disabled. In the 15 position, tone
controls maintain their normal function. After this modification, the other two positions
of the HI FILTER switch (10 and 7) are not available. You can install optional resistors
(not provided) that drop the Line Amp gain when the tone controls are off. This drops the
gain of the Line Amp, increasing Signal to Noise Ratio.
The regulated power supply kit replaces the original diodes, 3-section cap, and resistors
with an electronically regulated power supply. When you install the PAT4PWR supply,
you dramatically reduce the hum in the PAT-4. It mounts conveniently in existing holes
in the PAT-4.
These upgrades can be installed in any combination, but the phono upgrade kit requires
the PAT4PWR supply to be installed.

Who Should Attempt these Projects?

You can build this kit if you can:
1. solder (using normal rosin core solder and a soldering iron),
2. use simple hand tools like screwdrivers, wire cutters, and pliers, and
3. Read and follow directions.
It helps if you:
1. know a bit about electronics, or
2. have a friend who knows a bit about electronics
3. can get to YouTube to watch a few helpful videos about the assembly process (not
available as of this version of the manual)
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