Tubes4HiFi   PH16 phono preamp assembly manual

lots of photos loading, this may take a minute!
some of these photos show an older version PCB, but the general ideas are still the same!

---

first rule of VTA builds . . . use a meter, don't trust color codes or markings on resistors!!

---

resistors are soldered on the PCB first, flush to the board
BTW, almost all of the resistors for the PH16 kit are mil-spec low-noise RN55 and do not use color codes

---

standard procedure is to orient all the resistors the same way,
so you can read the colors or the codes, easier to troubleshoot if a problem occurs!
don't confuse the 28.7K resistors (2872F) with the 287K resistors (2873F)

---

one and two watt resistors should be spaced 1/16th to 1/8th inch above the PCB to allow heat dissapation!

---

all resistor values are facing up and oriented in the same direction,
it takes an extra second and can save alot of time and trouble later if you make a mistake!

---

finished PCB, cartridge loading adjustment resistors and caps on the input side of the PCB,
note switch 2 is ON, this is for standard 47K MM cartridges, all other switches are in OFF position

---

finished power supply board, resistors and diodes soldered in place, the big diodes are spaced up 1/8" above the PCB
note that the large 1K resistor center bottom can be replaced with a 155J choke if you wish

---

chassis drilled for PCBs, dampening sheet and power transformer installed

---

rear view of PH16

---

front view of PH16

---

.
power switch and LED      . . .                        . . .      fuse and AC power filter

---

wiring added to bottom of power supply board
bottom of power supply board, large black jumper in center is ground
two red wires are B+1, two blue wires are B+2, green wires are H+/H- (filaments), and red/black pair is to front panel LED

---

power supply board mounted in place and ready for power transformer wiring
green and brown windings are connected together, grey wire will not be used

---

transformer connections made to power supply
purple wire is earth ground, connected to ground on power supply
white and yellow wires are HV (200vac high-voltage), orange and blue are 12vac for filaments

---

rear panel RCA jacks wired
inputs are on left with mini-shielded video cable, outputs are on right

---

wiring is all done, overview of chassis interior, top view

---

another overview of chassis interior, front to rear

---

another overview of chassis interior, rear to front

---

front panel view

---

rear panel view

---

finished phono preamp, professionally assembled & fully tested by Roy Mottram
Vacuum Tube Audio www.tubes4hifi.com/PH16.htm
$700 as a full kit, or just like this one ready to plug & play, for $900

---

frequency response verified to be flat (down 0.3db) from 9Hz to 22KHz, output impedance is 330 ohms

---