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Warning!

  

 

 
 

This kit has the potential to be connected to, or generate, high voltages and currents, and high localized temperatures that could cause injury or death to the assembler, operator or end user. 
This kit is solely intended as study material for aesthetic and educational purposes. However, should the assembled kit be accidentally or deliberately connected to a source of mains electrical power, potentially lethal voltages and currents could exist within the assembled unit.  
This kit must only be assembled by a suitably experienced and qualified electrical or electronic engineer under proper supervision and with suitable safety precautions in place. Ensuring the experience and qualifications criteria are fully understood and complied with is the whole responsibility of the assembler.  
Ensuring that this unit is not operated in a way which could cause injury or death is wholly the responsibility of the assembler, operator or end user. 
In assembling this kit, you are accepting that all the above warnings and necessary qualifications are understood and complied with and the assembly is at your own risk.  
 
Should this unit be accidentally or deliberately connected to a source of mains power, the following precautions should be observed. 
 
High voltages and currents and localized temperatures will be present on many of the components which could cause injury or death. Voltages in excess of 390v dc and 270v ac may exist even after the source of mains power has been removed. These potentially lethal voltages may be present on many of the components for several 
minutes after the power source has been removed. Voltages at the appropriate test points should be carefully measured with suitable test equipment to ascertain the safe or unsafe status of the unit. If the unit has been assembled incorrectly, the capacitors may also represent an explosion risk. 
 
General assembly tips. 
 
1] Take your time. (It is a lot quicker to get it right first time than get it wrong and have to perform corrective measures). 
2] Use a suitably powerful soldering iron to ensure that the solder flows properly. This is particularly important for the contacts which are attached to the ground plane and the heatsink securing pins. 
3] Ensure that the capacitors are fitted the correct way round as reversing their polarity could be potentially hazardous. 
4] Don’t overtighten the chassis screws else you will never get them out again. 
 
If in doubt ask ! 
 

End User License Agreement – EULA 

End User EDUCATIONAL KIT License Agreement for Audio Maintenance Limited 
NOTICE TO ALL USERS: PLEASE CAREFULLY READ THE FOLLOWING LEGAL AGREEMENT (“AGREEMENT”) FOR THE LICENSE EDUCATIONAL KIT BY AUDIO MAINTENANCE LIMITED. BY CLICKING THE 
ENTER BUTTON OR PURCHASING THE EDUCATIONAL KIT, YOU (EITHER AN INDIVIDUAL OR A SINGLE ENTITY) CONSENT TO BE BOUND BY AND BECOME A PARTY TO THIS AGREEMENT. IF YOU DO NOT AGREE TO ALL OF THE 
TERMS OF THIS AGREEMENT DO NOT PURCHASE THE EDUCATIONAL KIT. 
1. License Grant. Subject to the payment of the applicable license fees, and subject to the terms and conditions of this Agreement, Audio Maintenance Limited hereby grants to you a non-exclusive, non-transferable right to use one copy of the specified version of the Educational Kit and the accompanying BUILD MANUAL (“colourbook”). 
Audio Maintenance Limited designs and creates printed circuit boards and supplies electronic and electrical components as “kits” which are primarily intended for educational purposes (or “Objet d’art”) but can function as electronics or electrical equipment. As such, Audio Maintenance Limited is held harmless from any harm or damage 
which might occur to individuals in the use or function of any Audio Maintenance Limited product. The assembled kit is for display purposes only and is not to be connected to a source of mains electrical power. 
2. Term. This Agreement is effective for an unlimited duration unless and until earlier terminated as set forth herein. This Agreement will terminate automatically if you fail to comply with any of the limitations or other requirements described 
herein. Upon any termination or expiration of this Agreement, you must destroy all copies of the Educational Kit and the Documentation. You may terminate this Agreement at any point by destroying all copies of the Educational Kit and the 
Documentation. 
3. Ownership Rights. The Educational Kit is protected by United Kingdom copyright laws and international treaty provisions. Audio Maintenance Limited and its suppliers own and retain all right, title and interest in and to the Educational Kit, including all copyrights, patents, trade secret rights, trademarks and other intellectual property 
rights therein. Your possession, installation, or use of the Educational Kit does not transfer to you any title to the intellectual property in the Educational Kit, and you will not acquire any rights to the Educational Kit except as expressly set forth in this Agreement. 
4. Restrictions. You may not rent, lease, loan, sublicense or resell the Educational Kit. You may not permit third parties to benefit from the use or functionality of the Educational Kit via a timesharing, service bureau or other arrangement. You may not 
transfer any of the rights granted to you under this Agreement. You may not reverse engineer, de-compile, or disassemble the Educational Kit, except to the extent the foregoing restriction is expressly prohibited by applicable law. You may not 
modify, or create derivative works based upon, the Educational Kit in whole or in part. You may 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 from the date of original purchase of the Educational Kit, its component contents will be free from defects in materials and workmanship. 
b. Remedies. Audio Maintenance Limited and its suppliers entire liability and your exclusive remedy for any breach of the foregoing warranty shall be, at Audio Maintenance Limited option, either (i) return of the purchase price paid for the license, if any, or (ii) replacement of the defective parts contained within the Educational Kit. You 
must return the parts contained within the Educational Kit to Audio Maintenance Limited at your expense with a copy of your receipt. This limited warranty is void if the defect has resulted from accident, abuse, or misapplication. Any replacement parts will be warranted for the remainder of the original warranty period. Outside the United 
Kingdom, this remedy is not available to the extent Audio Maintenance Limited is subject to restrictions under United Kingdom export control laws and regulations. 
c. Warranty Disclaimer. Except for the limited warranty set forth herein, THE EDUCATIONAL KIT IS PROVIDED “AS IS.” TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, AUDIO MAINTENANCE LIMITED DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED 
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NONINFRINGEMENT WITH RESPECT TO THE EDUCATIONAL KIT AND THE ACCOMPANYING DOCUMENTATION. YOU ASSUME RESPONSIBILITY FOR SELECTING THE EDUCATIONAL KIT TO ACHIEVE YOUR INTENDED 
RESULTS, AND FOR THE INSTALLATION OF, USE OF, AND RESULTS OBTAINED FROM THE EDUCATIONAL KIT. WITHOUT LIMITING THE FOREGOING PROVISIONS, AUDIO MAINTENANCE LIMITED MAKES NO WARRANTY THAT THE EDUCATIONAL KIT WILL BE ERROR-FREE OR FREE FROM INTERRUPTIONS OR 
OTHER FAILURES OR THAT THE EDUCATIONAL KIT WILL MEET YOUR REQUIREMENTS. The foregoing provisions shall be enforceable to the maximum extent permitted by applicable law. 
6. Limitation of Liability. UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY, WHETHER IN TORT, CONTRACT, OR OTHERWISE, SHALL AUDIO MAINTENANCE LIMITED OR ITS SUPPLIERS BE LIABLE TO YOU OR TO ANY OTHER PERSON FOR ANY INDIRECT, SPECIAL, IN-CIDENTAL, OR CONSEQUENTIAL 
DAMAGES OF ANY CHARACTER INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF GOODWILL, COMPUTER FAILURE OR MALFUNCTION, OR FOR ANY AND ALL OTHER DAMAGES OR LOSSES. IN NO EVENT WILL AUDIO MAINTENANCE LIMITED BE LIABLE FOR ANY DAMAGES IN EXCESS OF THE LIST 
PRICE AUDIO MAINTENANCE LIMITED CHARGES FOR A LICENSE TO THE EDUCATIONAL KIT, EVEN IF AUDIO MAINTENANCE LIMITED SHALL HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. FURTHERMORE. The foregoing provisions shall be enforceable to the maximum extent permitted by applicable 
law. 
7. Miscellaneous. This Agreement is governed by the laws of the United Kingdom, without reference to conflict of laws principles, and the parties agree that the sole location and venue for any litigation which may arise 
hereunder shall be England . The application of the United Nations Convention of Contracts for the International Sale of Goods is expressly excluded. This Agreement sets forth all rights for the user of the Educational Kit and is the 
entire agreement between the parties. This Agreement supersedes any other communications with respect to the Educational Kit and Documentation. This Agreement may not be modified except by a written addendum issued by a duly 
authorized representative of Audio Maintenance Limited. No provision hereof shall be deemed waived unless such waiver shall be in writing and signed by Audio Maintenance Limited or a duly authorized representative of Audio Maintenance Limited. If any provision of this Agreement is held invalid, the remainder of this Agreement shall 
continue in full force and effect. The parties confirm that it is their wish that this Agreement has been written in the English language only. 
8. The Educational Kit and MANUAL are provided with Restricted Rights. Use, duplication, or disclosure by the United Kingdom Government may be subject to restrictions. Manufacturer is Audio Maintenance Limited, Manchester, UK. 
9. You agree that you will not export or re-export the Educational Kit or Documentation to any country, person, entity or end user subject to United Kingdom export restrictions. Restricted countries currently include, but are not necessarily limited to Cuba, 
Iran, Iraq, Libya, North Korea, Sudan, and Syria. 
10. The contents of the educational kit are subject to change without prior notice and sales are subject to Audio Maintenance Limited’s standard terms and conditions of business (available on request). Assembly of this kit must only be performed by a suitably qualified engineer who holds a current Audio Maintenance Limited High Voltage 
Kit Build certificate. 
You warrant and represent that neither the United Kingdom Government nor any other United Kingdom Government agency has suspended, revoked or denied your export privileges. 
 
 

Attention/Disclaimer 
 

Although this kit can be assembled and built into a functioning audio equalizer, due to the high voltages and possibilities of human builder error, Audio Maintenance Limited hereby assumes no liability for injury/damage/ loss which might unintentionally occur. 
 
This manual is for informational purposes only. 
 
Copyright © 2013 Audio Maintenance Limited. All Rights Reserved. 

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 ...

Page 41: ......

Page 42: ......

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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