Amp Power Supply

Power Supply Parts	Description	No.	Supplier	Stock No.	USD ea.	Total
T1	TRNS, 300VA, 40V, Center Tap	1	Antek	AN-3240	36.00	36.00
BR1	RECTIFIER BRIDGE 200V 25A D-34A	1	DK	26MB20A-ND	8.87	8.87
CP1, CP2	CAP 12000UF 80V ELECT TUP SERIES	2	DK	P10032-ND	12.07	24.14
CP3	CAP .1UF 250VDC METAL POLY CAP	1	DK	EF2104-ND	0.34	0.34
AC1	AC Receptacle IEC 320-C14	1	DK	Q210-ND	0.70	0.70
PC1	Power Cable, NEMA 5-15P to IEC 320-C13	1	DK	Q125-ND	4.1	4.10
FH1	HOLDER FUSE 3AG .500"L 1POS	1	DK	3536K-ND	1.55	1.55
FH2	HOLDER FUSE 3AG 2.375"L 4POS	1	DK	3539K-ND	5.28	5.28
F1	FUSE 8A 250V T-LAG GLS MD	4	DK	283-2755-ND	1.00	4.00
F2-F5	FUSE 5A 250V FAST AGC GLASS	8	DK	283-2635-ND	0.70	5.60
R52	RES 3.9K OHM 2W 5% METAL OXIDE	2	DK	OY39GK-ND	0.25	0.50
R53	RES CERAMIC COMP 100 OHM 2W	1	DK	OY101KE-ND	1.28	1.28
TS	Terminal Strip	1	NA	Generic	5.00	5.00
S1	SWITCH TOGGLE DPST 5A SLDR 5PCS	1	DK	360-2087-ND	7.65	7.65
Total	NA	NA	NA	NA	NA	105.01

Tip For Soldering Wire Leads to Small Components
Measure and cut the wire leads. Include enough excess to route the lead from that component to the final connection. Strip the component end of the lead back, twist the strands together, apply flux and tin with a generous amount of solder. Secure the small component gently with a bench vice, locking pliers, mount point, masking tape, etc. Apply flux to the component lead and tin with a generous amount of solder. Attach the lead to the component by touching the tinned leads together and then applying the soldering iron tip. As soon a the solder flows between both leads, remove the iron while holding the lead steady until the solder hardens. It is generally not necessary to twist the leads together or insert the lead through a hole in a solder lug because the solder is strong enough. De-soldering components that have been mechanically joined before soldering can be time consuming.

Tip For Soldering Wire Leads to Small Components

Measure and cut the wire leads. Include enough excess to route the lead from that component to the final connection.
Strip the component end of the lead back, twist the strands together, apply flux and tin with a generous amount of solder.
Secure the small component gently with a bench vice, locking pliers, mount point, masking tape, etc.
Apply flux to the component lead and tin with a generous amount of solder.
Attach the lead to the component by touching the tinned leads together and then applying the soldering iron tip. As soon a the solder flows between both leads, remove the iron while holding the lead steady until the solder hardens.
It is generally not necessary to twist the leads together or insert the lead through a hole in a solder lug because the solder is strong enough. De-soldering components that have been mechanically joined before soldering can be time consuming.

Attach the terminal strip to the chassis about 1" from the ground clip and parallel to the right channel amplifier fin with two #6 counter sink machine screws. The terminal strip simplifies connection between transformer, PSDU and amplifier boards by making these components modular.
Solder the snubbing capacitor to the AC terminals of the rectifier. Wrap and solder the leads as close to the body of the rectifier as possible to avoid interference with the slip on terminals.
Remove the PSDU and attach the fuse buses (F1-F5) to the rectifier post. Install washers between to allow passage of the capacitor wire ties. Attach the bridge rectifier to the top of the rectifier post with a 1/4" machine screw.
Mount the toroid transformer to the toroid bracket. A new transformer will come with two round rubber disks and steel washer for mounting. One disk is placed between the transformer and bracket. The other is placed between the transformer and washer. Since the transformer is mounted on edge, place a small piece of foam or cardboard between it and the chassis base to protect the windings. The primary and secondary leads should face toward the bracket. The center bolt (or all-thread) should be cut so no excess is protruding.
Install the power switch on the controls panel.
Wire the circuit according to the schematic above. The wiring on the primary and secondary side of the transformer should be 14 gauge stranded copper hook up wire. The wiring from the DC side of the rectifier should be 18 gauge stranded copper.
Power up the supply and measure the DC voltage at the terminal strip. It should measure "+" and "-" 56 - 59 Volts.
The bleeder resistors (R52) are shown below. One end of each is soldered to the rectifier connectors (+/-). The other ends are joined and grounded to the chassis using the rectifier bolt.