Related Manuals for DYNACO PAT-5
Summary of Contents for DYNACO PAT-5
- Page 1 Updatemydynaco Dynaco PAT-5 Preamp Replacement Power Supply (PAT5PWR) ASSEMBLY MANUAL Rev E Hardware © 2018 AkitikA LLC All rights reserved Revision 3p07 September 15, 2018 Page 1 of 18...
-
Page 2: Table Of Contents
About the Design ......................17 Table of Figures Figure 1-Assembled PAT-5 Power Supply. Note that U2, U3, and Q2 get tall heatsinks . 5 Figure 2-Empty the power supply components into a soup bowl ........6 Figure 3-Silk screen shows power supply component locations ........6 Figure 4-Regulator and Heat Sink Assembly Detail............ -
Page 3: Section 1: About This Manual
Section 1: About This Manual This manual gives the information needed to build and install the upgraded power supply for Dynaco’s PAT-5 Preamp. This manual covers the assembly of Rev E hardware. Rev E hardware. The Rev E version can support up to 100 mA load current, nearly twice of what earlier versions can support. -
Page 4: Important Safety Notes
Important Safety Notes By purchasing, using, or assembling this kit, you have agreed to hold Akitika LLC harmless for any injuries you may receive in its assembly and/or use. To prevent injuries: Wear safety glasses when soldering or clipping wires to prevent eye injuries. ... -
Page 5: Section 2: Kit Building Hints
Is something in this manual confusing? Does something look wrong? Send your questions by email to dan@akitika.com or dan@updatemydynaco.com. You’ll help yourself and everyone who builds the kit. Figure 1-Assembled PAT-5 Power Supply. Note that U2, U3, and Q2 get tall heatsinks Page 5 of 18... -
Page 6: Section 3: Building The Power Supply
Section 3: Building the Power Supply This section details the process of building the power supply circuit board. Begin by carefully emptying the contents of the parts envelope into a broad soup bowl, as shown below. In general, you’ll start with the components that lay closest to the board, working your way towards the taller components. -
Page 7: Component Order
Component Order You’ll notice that the component designations in the directions don’t go exactly in order. We have grouped them so that all components with the same value appear together. This makes assembly easier. You’ll find in the parts kit that similar parts, e.g. 3 1K resistors, are typically (though not always) taped together. -
Page 8: Install R14
Diodes – watch the polarity! Designation Type Rating, Marking, Description Done? () 1N4004 400 PIV 1 Amp, 1N4004, rectifier diode 1N4004 400 PIV 1 Amp, 1N4004, rectifier diode 1N4004 400 PIV 1 Amp, 1N4004, rectifier diode 1N4004 400 PIV 1 Amp, 1N4004, rectifier diode 1N4004 400 PIV 1 Amp, 1N4004, rectifier diode 1N4004 400 PIV 1 Amp, 1N4004, rectifier diode 1N4004 400 PIV 1 Amp, 1N4004, rectifier diode... -
Page 9: Assembly Hint
Assembly Hint You’ll want to get the regulator or transistors leads bent so that when laying down, the mounting holes line up well. To do this, I put the leads halfway into their mounting holes, then slowly bend the regulator over into position while aiming the hole in the device for the hole in the PCB. -
Page 10: Install The Small Non-Polar Capacitors
It’s good practice to keep the bottom heatsink straight so that it doesn’t touch the near-by trace. It’s actually not a problem if it does touch it, since the two nets are connected Figure 7). Figure 7-Line up the bottom heatsink to not touch the nearby trace Install the Small Non-polar Capacitors Orientation of these caps does not matter. -
Page 11: Check Your Work
Voltages less than the indicated amount (for example, if the -15 measured only - 3) might indicate either a problem with the original power supply, or a problem with the PAT-5 circuits. If you have that condition, the next few instructions well help you sort it out. -
Page 12: If Your Voltages Were Out Of Tolerance
The power supply PCB has numbered eyelets. Use the supplied labels to mark wires 1-8 to make assembly easier. If your PAT-5 was wired for 240 volt operation, then there also will be wires in eyelets 9, 10, and 11. Make your own masking tape labels for the wires that go there if they are present. -
Page 13: Removing The Old Power Supply
Removing the Old Power Supply The mechanical design of the PAT-5 Preamp makes removing the old power supply a lot of work. Your soup bowl will come in handy again as a safe place to collect all the bits and pieces you’ll need to remove to change the power supply. -
Page 14: Figure 9-Remove These 2 Screws And 2 Screws On The Opposite Side
Remove the two 4-40 screws and nuts from the back panel that hold the zig- zag shield and the power supply mounting bracket. Try to not let the nuts get away from you (Figure 10). Use a 1/16” Allen wrench to remove all the front panel knobs. I like to turn all the knobs fully counterclockwise before I start. -
Page 15: Installing The New Power Supply
Remove the old power supply Done? () Remove the four screws (two in each bracket) that hold the silver colored power supply mounting brackets to the power supply PCB. Installing the New Power Supply Figure 11-Mount new PCB to shield and mounting brackets Installing the new power supply Done? () Pull the Preamp’s AC plug and wait 1 minute before going on. -
Page 16: Testing The Power Supply In Place
Plug the PAT-5 into the AC power socket. Note: There are potentially lethal voltages inside the PAT-5 from the instant it is plugged in, regardless of the state of the ON-OFF switch! Be alert for any signs of distress or smoke from the new power supply. -
Page 17: Final Re-Assembly
U2 – 74 degrees C The resistor bodies from the original supply ran even hotter! Of course, there still may be some small amount of hum when you connect your PAT-5 to other components as a result of ground loops between the components. - Page 18 U3 – 82 degrees C Q2 – 92 degrees C Even the hottest device, Q2, has a junction temperature that is 125-92=33 C below the maximum recommended operating junction temperature. It is 58 C below the Absolute maximum operating junction temperature. The temperatures observed will decrease for loads less than 100 mA.