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Assembly Notes
Before you start building your kit, please take time to read the manual in full at least
once to enable you to fully understand the procedures and avoid any mistakes. The
following notes are important and should be read.
Requirements
The kit builder needs to have basic soldering skills and be able to read and understand
the wiring diagrams presented. Refer to the text and diagrams at each step throughout
the manual and ensure you double check all wiring at each stage. It is also
advantageous to refer to the circuit diagrams at the back of the manual throughout the
build.
Disclaimer:
1. Audion supplies this product as a kit of parts for self-assembly, and the
construction is entirely at your own risk. No warranty or responsibility will be
accepted or applied; any injury or damage will be the responsibility of the
assembler. The kit of parts does not constitute a finished product in any way.
2. When wiring the mains sockets, switches, and mains transformer the attaching
wires should all be tinned and wrapped where possible before being soldered.
This ensures that wires are not held on to terminals purely by solder alone and
safeguards them against becoming loose.
3. When wiring an audio amplifier it is a good idea to wire each channel of the
amplifier symmetrically to keep all signal and power paths similar in length.
4. Warning: Extreme care should be taken when testing the amplifier as it will
need to be switched on with the cover panels removed. Unless you are
completely familiar with electronics and the circuit layout of the amplifier, it
is best to assume that ALL connections are of very high voltage and can at the
very least cause serious injury.
5. This kit is intended for assembly only by adults who have a good
understanding of electronics and electronic construction. Please note - all
valves in the finished product get very hot in normal operation; care must be
taken to protect yourself and children by avoiding contact with them.
WARNING: The high voltages present in this kit can kill and the high
operating temperatures can burn. Observe all precautions and never
connect the kit to an electrical supply until it has been fully assembled,
checked and ready for testing. You assume total responsibility and
liability for the use and operation of this kit both for yourself and people
Version 1.32
1

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Summary of Contents for Audion Edison 60

  • Page 1 Disclaimer: 1. Audion supplies this product as a kit of parts for self-assembly, and the construction is entirely at your own risk. No warranty or responsibility will be accepted or applied; any injury or damage will be the responsibility of the assembler.
  • Page 2 You will need to purchase an I.E.C. fused mains lead with a 5-amp fuse fitted in the plug. Bill of materials for the Edison 60 kit: 1 x Bottom chassis panel 1 x Bottom cover plate 1 x Front chassis panel 2 x Side panels –...
  • Page 3 1 x Mains switch 1 x Fused mains socket 1 x Fuse holder 1 x T3.15A 250V fuse (Note: ‘T’ denotes slow-blow) 2 x DPDT switches 4x Red speaker terminals 4 x Black speaker terminals 2 x 22R 2W Resistors The audio PCB pack contains (2 off per kit): 2 x 6922 9-way valve bases (for V3 and V4) 4 x 0.33uF/0.47uF 630V signal capacitors (C1,C2,C10,C13)
  • Page 4 4 x cable ties Short length of heat-shrink sleeving The Edison 60 Plus kit contains the following as extra to the above: 1 x Power supply pack (detailed above) Stainless-steel mirror-finished top cover (as seen in the photo on the kits home page).
  • Page 5 Recommended Solder It is recommended that solder with flux, designed for electronics is used. This usually has up to 2% of Silver that prevents the joint from becoming brittle over time. It provides a much stronger solder joint but can be difficult to work with due to its lower ‘wetting’...
  • Page 6 After installation, check the instructions again: Once a part is installed, double- check the installation against the printed instructions. Audio PCB Assembly Instructions: We assume that you will configure your kit in PP mode, the following instructions are to do that . On the main PCB mount resistors R6, R7, R8, R29, R18, R30, and R31 approximately 7mm above the board (these use the Blue PTFE sleeves to mount them off the board as they run warm in use), as well as (R52 for PSE mode) if you are...
  • Page 7 Power Supply PCB Assembly Instructions: Insert and solder resistors R19, R20, R33, and R34, as well as diodes D1 to D4 observing their polarity. Solder R35 approximately 7mm above the board (this resistor uses the Blue PTFE sleeves to mount it off the board as it can run warm in use). Solder the terminal pins X15, X16, X17, and X18.
  • Page 8 solder terminals on the output transformers (8 terminals) should point towards the front of the amplifier. Fit the mains transformer using the separate fixing kit supplied. Use the pad either side, and the large metal disc on the top secured with the long M8 bolt and nut. It is important to mount the mains transformer so that the wires point towards the front of the amplifier to avoid inducing mains hum into the output transformers;...
  • Page 9 Figure 1. Mains socket switch connections Figure 2 below shows the different windings on the mains transformer, not all of them are used. Connect the mains transformer starting with the primary side that contains two pairs of 115V windings. For 220V/240V mains: Solder the interior blue and brown wires together and fold them over to leave them approximately 5cm in length.
  • Page 10 Figure 2. Mains transformer windings- REFER TO ADDENDUM NOTES It is good practice to twist the mains wire blue brown together as this reduces hum. A light twist aprox. every 1 - 1.5cm should be fine. Blue White X15 on PSU Brown 120V Cut and Insulate...
  • Page 11 Original transformer layout. The new transformer, although now larger, is designed for longer life. Next connect the high-tension wires, which are enclosed in a fibre sleeves. The black and white go to points X15 and X16 on the power supply board and supply 460V AC from 240V AC mains.
  • Page 12 The EL34 valve bases need connecting to the PCB’s. The valve base pins are numbered 1 to 8. Warning: be sure to read the numbering correctly as it is easy to make a mistake. Pin 1 must be linked to pin 8 on all four of the EL34 valve bases, and extended to points X1 and X4 on the respective valve bases.
  • Page 13 transformer terminal B1 can now be soldered but be careful not to heat the tags for prolonged periods as they are plastic and can melt. For clarity when looking at the output transformer, on the secondary winding side you will see three pins, two are closer together and one is slightly further away. The one slightly further away is the 0 ohm tapping, the middle is the 4 ohm tapping and the pin closer to that is the 8 ohm tapping.
  • Page 14 Configuring The Output Transformer For PP Mode: Output transformer for Edison 60 power amplifier kits. Top view down with pins closest to you. PLEASE NOTE : New transformers have slightly different end frames so may need 2 extra holes drilling in the chassis to fit them properly! Figure 4.
  • Page 15 Connect point X5 on each main PCB to its corresponding output transformer terminal A3 (shown on figure 4 above). For connecting the EL34 valve bases to the output transformers, starting with the left PCB, link a wire from pin 3 on valve base V1, to terminal A1 on the output transformer.
  • Page 16 Connect up the links as shown in figure 5 or 6 above. Connect point X5 on each main PCB to terminal A5 on the corresponding output transformers. On the left PCB connect pin 3 on both V1 and V2, to A1 on the output transformer. Now connect the two screen grid wires that come from pin 6 on each EL34, to A3 on the left transformer.
  • Page 17 Note for the Edison 60 Plus kit: An extra pair of 22 ohm resistors is supplied to connect in parallel onto the tag with the others, this is for the split grounds The screening, which is the ground connection for each input, should all be linked to ground point X10 on the left PCB next to the volume pot.
  • Page 18 down (anti-clockwise) so that the voltages are not affected by the output signal. The voltages can be measured with the amplifier stood up on one end. Be careful here as standing on its end is very unstable and catching an amp that is falling when switched on could present a shock hazard.
  • Page 19 We hope that you enjoy building your kit!!! If you have any technical queries or construction problems please email technical@audion.co.uk This handbook may contain mistakes and printing errors. The information in this handbook is regularly checked and corrections made in the next issue. We accept no liability for technical mistakes or printing errors, or their consequences.
  • Page 20 Silver Night Format output transformer The silver Night output transformer designed for the Edison 60 power amplifier kits. Top view down with pins closest to you. PLEASE NOTE : This transformer uses the same grain orientated silicon steel M6...
  • Page 21 Additional Notes for High mains supplies (From our customers) HT supplies The aim was to maximise the HT to the main output valves with the lowest series resistance before X5, without introducing 100Hz hum, or resulting in a voltage on the first reservoir capacitor (C7/8) greater than about 490Vdc (given their rating of 500Vdc).
  • Page 22 0.6R in series with the feed to V3/V4 (in series with X7, not X8, the side tied to 0V). (2 x 1.2R metal film 2W in parallel). Depending on what combination of 6N1P (Ih = 0.55-0.6A) and E88CC/ECC88 (Ih = 0.3A) are fitted, this results in Vh of between approximately 6.2 –...

This manual is also suitable for:

Edison 60 plus