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AML ezP-1A Assembly Manual Download Page 36

Passive
Equaliser 
Circuit

Date

File

Drawn by

Sheet

Rev

Title

Number

Audio Maintenance Limited

E-Mail: [email protected]

C Adshead

1 of 2

Chassis Ground

C

h

a

s

s

is

 G

ro

u

n

d

Analogue Ground

+325v

Heater Feed

Heater Return

TP1

TP2

TP3

TP4

TP9

TP10

TP8

TP7

TP11

TP5

TP6

VTB2408

(600R:600R)

2

4

3

5

10

8

9

7

6

11

6

11

5

3

4

2

7

9

8

10

VTB2424
(20k:80k)

VTB2425

(15k:600R:24R)

Yellow

Green

Brown

Blue

Violet

Red
Orange

White

Blue/Yellow

Pink

Grey

VTB2425

(Molex KK option)

Blue

Brown

Green

Pink

Grey

Blue/Yellow

White

Yellow

Violet

Red

Orange

Pultec Gain Stage

AML-07-102

4

24th Sept 2015

AML-07-102 - rev4

TP16

Gain Adjust

Summary of Contents for ezP-1A

Page 1: ...ezP 1A Passive Program Equalizer Assembly manual Colourbook Issue 1a ...

Page 2: ...not copy the Educational Kit or Documentation You may not remove any proprietary notices or labels on the Educational Kit All copies must contain the same proprietary notices that appear on and in the Educational Kit All rights not expressly set forth hereunder are reserved by Audio Maintenance Limited 5 Warranty and Disclaimer a Limited Warranty Audio Maintenance Limited warrants that for 1 year ...

Page 3: ...ezP 1A Colourbook Contents Section 1 Colourbook assembly guide Section 2 Schematics diagrams and PCB Overlays Section 3 Parts List ...

Page 4: ...Revisions 1 to 1a Updated to Revision 4 Gain stage PCB Gain adjustment trimmer added ezP 1A Colourbook revision history ...

Page 5: ...11 10 9 8 7 10 11 9 8 7 6 5 4 3 2 230v VTB2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 D1 D2 D3 D4 1N4007 4 ZD1 15v Zener 1 ZD2 160v Zener 1 ZD3 180v Zener 1 Diodes and Zeners ...

Page 6: ... ecc82 2 3 4 5 6 11 10 9 8 7 10 11 9 8 7 6 5 4 3 2 230v VTB2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 R37 R44 R47 0R 3 R31 R32 R35 1R0 3 R41 10R 1 Resistors ...

Page 7: ...3 4 5 6 11 10 9 8 7 10 11 9 8 7 6 5 4 3 2 230v VTB2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 R10 R15 R39 360R 3 R1 R3 R11 R45 R46 620R 5 R14 R38 R42 1k0 3 Resistors ...

Page 8: ... 2 3 4 5 6 11 10 9 8 7 10 11 9 8 7 6 5 4 3 2 230v VTB2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 R9 R12 2k0 2 R16 R17 R23 R24 2k2 4 R8 R13 2k7 2 R2 43k 1 Resistors ...

Page 9: ...0 9 8 7 10 11 9 8 7 6 5 4 3 2 230v VTB2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 R18 R43 47k 2 R20 R40 62k 2 R4 R5 R6 R7 R21 R25 R28 R29 R33 R34 100k 10 R27 R30 120k 2 Resistors ...

Page 10: ...c82 2 3 4 5 6 11 10 9 8 7 10 11 9 8 7 6 5 4 3 2 230v VTB2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 R26 R36 150k 2 R19 R22 1M0 2 F1 F2 Ferrite Bead 2 Resistors ...

Page 11: ...4 5 6 11 10 9 8 7 10 11 9 8 7 6 5 4 3 2 230v VTB2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 C5 22pF 1 C23 100nF 1 C1 C3 220pF 2 C2 47pF 1 C4 680pF 1 Ceramic Capacitors ...

Page 12: ... 9 8 7 10 11 9 8 7 6 5 4 3 2 230v VTB2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 C9 3n3F 1 C21 C24 1uF 2 C17 C18 100nF 2 Film Capacitors and Trimmer VR1 500R Top Adjust Trimmer 1 ...

Page 13: ... 10 11 9 8 7 6 5 4 3 2 230v VTB2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 C13 C20 100nF 400v 2 Q2 Q3 KSP44 2 CL 1 CL2 100pF C L Network 2 C6 C7 270nF 250v 2 Film Capacitors Transist...

Page 14: ...n become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 PL1 PL2 PL3 PL4 Molex KK Series 4 PL1 12 Way 1 PL2 5 Way 1 PL3 3 Way 1 PL4 2 Way 1 Latches toward output transformer Latch Latch towards rear Latch towards rear 24v Lamp Terminals 0 25in spade term...

Page 15: ...2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 Capacitors Bridge Rectifiers Valve Sockets C8 C10 47uF 63v 2 V1 V2 9 Pin Valve Socket 2 BR1 BR2 KBSP08 Bridge Rectifier 2 Positive terminal to the left it...

Page 16: ... operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 Fuse holders fuses Mains voltage selector SW1 Mains voltage selector switch 1 Note orientation After fitting select the appropriate voltage Slide to Left 110v 120v operation Slide to Right 220v 240v operation 230 230 FS1 FS2 Fus...

Page 17: ... 7 6 5 4 3 2 230v VTB2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 230 Large Capacitors C14 C19 C22 1000uF 16v 3 C11 C12 47uF 450v 2 Positive terminals towards left Positive terminals ...

Page 18: ...ow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 230 Mains Connector and Mains fuses FILTER1 Mains IEC Inlet filter 1 After fitting screws bend over pins before soldering M3 x 10mm Pan Head 2 Bend over pins Fit 2 fuses into fuse drawer then insert drawer into IEC inlet Fuse drawer has a keyed orientation Push ...

Page 19: ...can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 230 Heatsinks HS1 HS2 HS3 63mm Heatsink 3 Using a large soldering iron tip solder to the PCB Note orientation Tack in place first then check they are vertical before soldering completely Check Ve...

Page 20: ...Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 Insulators and power transistors Q1 Q4 TIP50 2 TO220 Insulator 2 Bridge Rectifier Insulator 1 Slide the small insulators over the TIP50 transistors insert transistors into PCB fit the retaining clips such that the body of the transistor is firmly pressed against the heatsink and then solder transis...

Page 21: ...Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 230 Large Capacitors and Input transformers C15 C16 470uF 400v 2 T1 VTB2408 1 NOTE ORIENTATION Make certain that the pin numbers on the bottom of the transformer coincide with the numbers written on the PCB These 2 transformers are different ways round from each other If possible lift the transformer about 2...

Page 22: ... 2 230v VTB2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 230 Output transformer and XLR s J1 Female XLR 1 Push Hard J3 Male XLR 1 T3 VTB2425 1 M3 x 30mm Pan head screw M3 x 4mm unthrea...

Page 23: ...2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 230 Mains Transformer and Valves T4 VTT2426 1 V1 ECC83 12ax7 1 V2 ECC82 12au7 1 Do not overtighten the M4 screw at this stage M4 x 16mm Pa...

Page 24: ...commercial use AML 07 095 Rev 3 Part 1 of 2 ezP 1A Passive Filter Controls Not for commercial use AML 07 095 Rev 3 Part 2 of 2 ezP 1A Passive Filter Controls Build Date Built By S N Build Date Built By S N R9 75R 1 R2 1k0 1 R1 10k 1 R3 1M0 1 Resistors ...

Page 25: ...e AML 07 095 Rev 3 Part 1 of 2 ezP 1A Passive Filter Controls Not for commercial use AML 07 095 Rev 3 Part 2 of 2 ezP 1A Passive Filter Controls Build Date Built By S N Build Date Built By S N C16 1nF 1 C6 C15 C17 4n7F 3 C10 12nF 1 C7 C14 C18 3n3F 3 Film Capacitors ...

Page 26: ...cial use AML 07 095 Rev 3 Part 1 of 2 ezP 1A Passive Filter Controls Not for commercial use AML 07 095 Rev 3 Part 2 of 2 ezP 1A Passive Filter Controls Build Date Built By S N Build Date Built By S N C12 15nF 1 C8 27nF 1 C9 56nF 1 C13 18nF 1 Film Capacitors ...

Page 27: ...07 095 Rev 3 Part 1 of 2 ezP 1A Passive Filter Controls Not for commercial use AML 07 095 Rev 3 Part 2 of 2 ezP 1A Passive Filter Controls Build Date Built By S N Build Date Built By S N C19 C20 68nF 2 C2 C11 330nF 2 C3 C4 470nF 2 C5 1uF 1 C1 C21 220nF 2 Film Capacitors ...

Page 28: ...ntrols Build Date Built By S N Build Date Built By S N Connectors and Inductor J2 10 Way Box Header 1 Note Orientation 80 mm Pin 1 Marker Pin 1 Marker J1 J3 10 Way Ribbon Cable 2 IN1 Inductor VTA1444 1 NOTE ORIENTATION Must match wire colours written on PCB NOTE ORIENTATION Must match wire colours written on PCB Red Orange Yellow Green Blue Violet Red Orange Yellow Green Blue Violet Note orientati...

Page 29: ...s Not for commercial use AML 07 095 Rev 3 Part 2 of 2 ezP 1A Passive Filter Controls Build Date Built By S N Build Date Built By S N Switches SW3 GR 03 001 1 12 position 1 pole 3 gang SW4 GR 03 002 1 12 position 1 pole 1 gang SW2 GR 03 003 1 6 position 2 pole 1 gang SW1 Toggle Switch DPDT Red Orange Yellow Green Blue Violet ...

Page 30: ...mmercial use AML 07 095 Rev 3 Part 2 of 2 ezP 1A Passive Filter Controls Build Date Built By S N Build Date Built By S N Red Orange Yellow Green Blue Violet Potentiometers R8 OM 01 086 1 1k Linear 20mm R7 OM 01 087 1 10k Linear 20mm R5 OM 01 088 1 10k Log 20mm R4 OM 01 084 1 2k2 Linear 20mm bracket R6 OM 01 085 1 100k Log 20mm bracket ...

Page 31: ... pins in positions shown then apply the self adhesive silver washers over the pin holes to stop the pins coming out Make sure the spindles are in the position shown before fitting pins Just in case they have been accidentally rotated during switch fitting Flat is at this angle HF Freq pins at 12 O clock and 3 O clock ...

Page 32: ...l is at the same side as the IEC inlet hole on the rear panel Fit the right hand side panel to the rear panel base panel using 5 of the chassis screws provided Attach the earth cable to the captive stud on the rear panel using 2 x M4 Shakeproof washers and 2 x M4 plain nuts provided Ensure the first M4 nut is very tightly fastened before fitting the second M4 nut tightly This is the safety earth b...

Page 33: ...th cable onto the exposed terminal of the IEC inlet Make certain it is fully pushed on and is a tight fit This is a safety earth connection Secure the XLRs to the rear panel using the 4 screws provided Do not overtighten Push the XLR s firmly against the rear panel while installing screws Secure the IEC inlet to the rear panel using the 2 x M3 x 10mm screws and 2 x M3 Nyloc nuts provided Fit the l...

Page 34: ...ly on a flat surface and tighten all the screws then tighten the nuts which secure the angle brackets to the front and rear panels Plug the spade connectors of the lamp cable onto the spade terminals Stick the 4 self adhesive rubber feet to the base panel Install the lower front panel PCB and secure with the pot switch nuts Place a shakeproof pot washer on the pot and a shakeproof switch washer on...

Page 35: ...art at the lower left hand side do the bottom row first Fit the lid using the remaining chassis screws However You may wish to adjust the mains transformer for minimum noise floor before fitting the lid Tighten the mains transformer securing screw through the hole in the base panel Install the upper front panel PCB and secure with the pot switch nuts Place a shakeproof pot washer on each of the po...

Page 36: ...Feed Heater Return TP1 TP2 TP3 TP4 TP9 TP10 TP8 TP7 TP11 TP5 TP6 VTB2408 600R 600R 2 4 3 5 10 8 9 7 6 11 6 11 5 3 4 2 7 9 8 10 VTB2424 20k 80k VTB2425 15k 600R 24R Yellow Green Brown Blue Violet Red Orange White Blue Yellow Pink Grey VTB2425 Molex KK option Blue Brown Green Pink Grey Blue Yellow White Yellow Violet Red Orange Pultec Gain Stage AML 07 102 4 24th Sept 2015 AML 07 102 rev4 TP16 Gain ...

Page 37: ...eturn 325v Analogue Ground Faceplate To Main Board Main Card 390v DC 335v DC 19v DC 12 6v DC above heater offset Analogue Ground Heater Offset 60v Passive in Hot Analog Gnd Passive out Hot Analog Gnd Analog Gnd Analog Gnd Analog Gnd Analog Gnd Analog Gnd Analog Gnd VTT2426 VTT2426 Molex KK option Green Yellow Blue Grey Violet Brown Red Red White White TP12 TP13 TP15 TP14 AML 07 102 rev4 24th Sept ...

Page 38: ...zP 1A Passive EQ Stage AML 07 095 Out to HS29 pin 4 AGnd In from HS56 pin 7 HF Boost HF Attenuator LF Attenuator Bandwidth LF Boost Low Frequency Boost Attenuate Select High Frequency Boost Select High Frequency Attenuation Select In Out Out In AML 07 095 rev3 3 29th May 2013 Brown Red Orange Yellow Green Blue Violet Grey ...

Page 39: ...ommon lF Attenuator Bottom to switches LF Attenuator Wiper to Switches HF Attenuator to IO switch common SUB Upper Pots AGnd SUB Upper Pots AGnd SUB Upper Pots AGnd SUB Upper Pots AGnd HF Attenuator Switch Cap Common HF Boost In HF Boost Wiper LF Attenuator Bottom LF Attenuator Wiper LF Boost Bottom Passive in Hot switches SUB Switches AGnd Passive out Hot switches SUB Switches AGnd SUB Switches A...

Page 40: ... off 115v 12ax7 ecc83 12au7 ecc82 2 3 4 5 6 11 10 9 8 7 10 11 9 8 7 6 5 4 3 2 230v VTB2408 VTB2424 VTB2425 24v Lamp VTT2426 Caution Components can become VERY HOT during normal operation Gain Adjust CUTOUT Yellow Red Green Violet Blue Grey Orange Pink Blue Yellow Brown White Brown Blue Grey Violet Green Yellow Red Red White White 230 1 2 3 4 5 6 ...

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Page 43: ...en Blue Violet Not for commercial use AML 07 095 Rev 3 Part 1 of 2 ezP 1A Passive Filter Controls Not for commercial use AML 07 095 Rev 3 Part 2 of 2 ezP 1A Passive Filter Controls Build Date Built By S N Build Date Built By S N ...

Page 44: ......

Page 45: ......

Page 46: ...he completed unit Adjust VR1 until you get exactly 0dBu at the output The full trim range is only about 2dB so you will not notice much change if you are trying to adjust while listening Adjusting VR1 allows you to better match the levels of 2 units ...

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