Instruction/ maintenance manual of the product Stereo 9-Pin PCB HP (Hewlett-Packard)
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AUDIO DESIGN Copyright 2006-2008© All Rights Reserved GlassWare Aikido Stereo 9-Pin PCB USER GUIDE Introduction Overview Schematics Recommended Configurations Tube Lists Assembly Instructions 05/29/2.
GlassWare Audio Design Warning! This PCB is for use with a high - voltage power supply; thus, a real shock hazard exists. Once the power supply is attached, be cautious at all times. In fact, always assume that capacitors will have retained their charge even after the power supply is disconnected or shut down.
GlassWare Audio Design 2 The A ikido ampli f i er de li vers th e so ni c goods. It offers lo w d i stortion, lo w output imp eda nce, a great PS RR f igure, and feedback - free ampl i f i cat ion .
Remember, tubes are not yardst icks that n eve r change , be in g more l ik e car t ir es — th ey we ar out. Just as a t ir e ’s we ight and diam eter decrease over t im e, so too the tub e ’s co ndu cta nce. So the fresh 6DJ8 i s not the same as that same 6DJ8 after 2,000 hours of use.
GlassWare Audio Design 4 Heater Issues The board assumes that a DC 12 V power supply will be used for the heaters, so that 6.3 V h eater tubes (like the 6 FQ7 a nd 6DJ8) or 12.
GlassWare Audio Design 5 DC Heater PS 300k 2W 100k 1/2W B+ B+ 4 300k 2W 100k 1/2W B+ 0.1µF 250V 0.1µF 250V AC 100 100 A lt er nati ve ly, you might exper im ent with floating the heater po we r supply, by “ground in g” the heater power supply v ia only a 0.
GlassWare Audio Design 6 Jump er J7 co nn ects the PCB’s ground to the chassis through the top centermost mountin g hol e. If yo u wish to float the chassis or capacitor couple the chassis to ground, th en either leave jumper J7 out or replace it with a small - valued capacitor (0.
GlassWare Audio Design 7 Configuring the PCB as a Line Amplifier The A ikido topology mak es a perfect lin e amplifier, as it offers lo w distortion, lo w output imp eda nce, and excellent power - supply noi se reject ion — all w ithout a global feedback loop.
GlassWare Audio Design 8 High tran sco ndu ctance output tubes are best for dr iving headphones, for example, the 6DJ8, 6H30, 12BH7, and ECC99. A coupling capacitor of at least 33µ F i s requ ir ed when driving 300 - ohm h eadpho n es; 330 µ F for 32 - ohm h eadphones.
GlassWare Audio Design 9 Assembly Before so ld er in g, be sure to clea n both s id es of the PCB with 90% isopropyl alcohol, w ipin g a way a ll f in gerprints. F ir st, so ld er the shortest parts (usually the resistors) in pla ce, then the next tallest parts, and then th e next tallest.
GlassWare Audio Design R4 R2 in out R8 R11 9 9 8 7 6 3 2 1 R3 R9 R1 C11 R5 R6 R12 R13 R7 C2 C12 in 9 9 B+ C1 R14 R14 R13 C1 C2 out out out 3 2 1 6 7 8 1 3 2 2 1 3 6 7 8 R1 R3 C11 R2 R5 R7 R11 R8 R4 R6 R12 R15 C6 R16 C5 R9 R10 R10 V1 V2 V4 V3 9-Pin Aikido Schematic (Rev.
GlassWare Audio Design 11 Top Side PCB Mechanical Layout 6 4 9 1 2 8 3 7 5 V1 5 7 3 8 2 1 9 4 6 V2 6 4 9 1 2 8 3 7 5 V3 5 7 3 8 2 1 9 4 6 V4 OVERALL PC BOARD DIMENSIONS: 4.00" x 10.0" 8 MOUNTING HOLE LOCATIONS 2.00" 2.75" 2.75" 2.
GlassWare Audio Design 12 The table above lists many tr iod es s uitable for the 9 - pin - based A ikido amplifi er PCB. The table lists the same tube under different B + voltages and w ith diff erent cathode res i stor values.
An important point after buying a device HP (Hewlett-Packard) Stereo 9-Pin PCB (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought HP (Hewlett-Packard) Stereo 9-Pin PCB yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data HP (Hewlett-Packard) Stereo 9-Pin PCB - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, HP (Hewlett-Packard) Stereo 9-Pin PCB you will learn all the available features of the product, as well as information on its operation. The information that you get HP (Hewlett-Packard) Stereo 9-Pin PCB will certainly help you make a decision on the purchase.
If you already are a holder of HP (Hewlett-Packard) Stereo 9-Pin PCB, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime HP (Hewlett-Packard) Stereo 9-Pin PCB.
However, one of the most important roles played by the user manual is to help in solving problems with HP (Hewlett-Packard) Stereo 9-Pin PCB. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device HP (Hewlett-Packard) Stereo 9-Pin PCB along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
