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Section 1: About This Manual
This manual gives the information you need to build and install the PAT-4 Phono Preamp
Replacement (and Upgrade), part number PAT4PPR, into your Dynaco PAT-4 Preamp.
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)
Line Stage Replacement Components (P4LSRC)
Phono section upgrade (PAT4LP)
In my opinion, this kit, the PAT4PPR is preferable to the PAT4LP, even though the
PAT4PPR costs more. Why?
The PAT4PPR kit is easier to build and install than the PAT4LP kit.
The PAT4PPR kit has a tight layout with ground-planes and bypass capacitors
that give it great high-frequency stability and noise rejection.
The PAT4PPR kit has a built-in second order high-pass filter that minimizes the
woofer wobble caused by record warp.
The PAT4PPR kit has a built-in second-order lowpass filter that makes it much
less likely to pick up external signals like switching transients and radio stations.
The PAT4PPR is installed much farther from the power supply, so picks up much
less of the stray hum fields inside the PAT-4. This makes it very quiet and free of
hum. The only hum you will pick up comes from the phono cables outside of the
PAT-4.
Note: 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)
Tools and Supplies You’ll Need
You’ll need the following tools:
1.
flat blade screwdrivers for #4 and #6 screws, #2 Philips head screwdriver
2.
a power drill with a 9/64” drill bit. A center punch is also helpful, as you will be
drilling two holes into the bottom of the PAT-4 Chassis.