AKAI AA-5210 #2: Parts List
I have assembled a parts list for this amplifier. My restoration touches some of the original transistors. Normally the original transistors contribute to the authentic AKAI sound. But modern equivalents are better in any aspects. I am also interested in exchanging the electrolytic capacitors. So this is what you will find listed below.
The schematic value corresponds to what normally can be found in the electrical schematics. The recommended value is what I replaced the former part with. Where I found appropriate, I have chosen a film capacitor replacement instead of an electrolytic. My reasons are reliability in time. Less electrolytic capacitors, less time-ticking bombs.
Descriptions and Parts Listings
The Power Amplifier Block is coded 96-5008 and is located in the bottom-right part of the steel chassis. You will recognize it by the power transistors which are mounted on an aluminum radiator.
|1-C1||2.2 uF / 50 V|
|1-C1b||2.2 uF / 50 V|
|1-C2||100 uF / 50 V|
|1-C2b||100 uF / 50 V|
|1-C5||2.2 uF / 80 V|
|1-C5b||2.2 uF / 80 V|
|1-C7||100 uF / 6.3 V||100 uF / 16 V|
|1-C7b||100 uF / 6.3 V||100 uF / 16 V|
|1-C9||1000 uF / 25 V AUDIO|
|1-C9b||1000 uF / 25 V AUDIO|
|1-C11||220 uF / 35 V|
|1-C11b||220 uF / 35 V|
The Tone Control Block is coded A5-5029 and is located in the front-center region of the steel chassis, next to the tone shaping potentiometers. For an easy maintenance access, you need to extract this board. Or you could work your way through the bottom of the amplifier chassis after you remove the switches printed circuit board.
|2-C1||47 uF / 50 V|
|2-C1b||47 uF / 50 V|
|2-C5||47 uF / 6.3 V||47 uF / 25 V|
|2-C5b||47 uF / 6.3 V||47 uF / 25 V|
|2-C6||4.7 uF / 25 V||4.7 uF / 50V|
|2-C6b||4.7 uF / 25 V||4.7 uF / 50V|
|2-C10||10 uF / 25 V||10 uF / 50 V|
|2-C10b||10 uF / 25 V||10 uF / 50 V|
|2-C12||100 uF / 6.3 V||100 uF / 25 V|
|2-C12b||100 uF / 6.3 V||100 uF / 25 V|
|2-C13||47 uF / 50 V|
|2-C13b||47 uF / 50 V|
|1-C14||2.2 uF / 25 V|
|1-C14b||2.2 uF / 25 V|
The Equalizer Block is coded A5-5028 and implements the Phono preamplifier and the RIAA correction curve. You can find it in the front-right part of the steel chassis, next to the Tone Control Block board. In order to operate changes, you need to extract this board too. Or you could work your way through the bottom of the amplifier chassis.
On this board the capacitors are listed for both channels.
|3-C1||100 uF / 16 V||100 uF / 25 V|
|3-C2||100 uF / 16 V||100 uF / 25 V|
|3-C3||1 uF / 25 V||1 uF / 50 V FILM|
|3-C4||1 uF / 25 V||1 uF / 50 V FILM|
|3-C5||2.2 uF / 25 V|
|3-C6||2.2 uF / 25 V|
|3-C7||10 uF / 25 V||10 uF / 50 V|
|3-C8||10 uF / 25 V||10 uF / 50 V|
|3-C9||1 uF / 50 V||1 uF / 50 V FILM|
|3-C10||1 uF / 50 V||1 uF / 50 V FILM|
The Power Supply Block is coded A5-5026 and occupies the bottom-center of the steel chassis next to the power transformer. You recognize it by the four rectifier diodes.
For the electrolytic capacitors on this board, you need to order only once.
|5-C1||100 uF / 63 V||100 uF / 100 V|
|5-C2||330 uF / 63 V||470 uF / 100 V|
|5-C3||330 uF / 63 V||470 uF / 100 V|
|5-C4||47 uF / 50 V||47 uF / 63 V|
The construction of this amplifier is straightforward and poses no problems for the restoration.
As always, let me throw a piece of advice. Do not hurry, take your time and do the job once. And do it well.