Original Eight Pin Volume Control Replaced In Pioneer Amp Model NO.SA610
This belonged to a known person, who did a painting job in our house several years back. He is a regular customer. This time he brought this Pioneer Amp with a request that its original Volume Control be replaced. The set is supposed to have an 8 pin volume control, whereas a six pin stereo V/C, with plastic spindle was in it.
The plastic spindle was fit inside the knob on another plastic sleeve inserted into the knob to enable proper hold. The extra two pins are centre tappings on the Volume control, to enable tone control. I had the replacement in stock, which had original metal spindle, very much suiting the length and diameter. Since the wiring done on this was suiting the six pin V/C, I had to download the service manual and take an extract of the volume control circuit, which I followed to do the wiring on the 8 pin V/C:
As the customer did not want me to do a thorough job of cleaning the board and replacing all electrolytic capacitors from the front panel boards as well,
I had no other go except to finish this simple job and give it in working condition. Here are a few pictures of the inside and that of the set working:
But, as far as the work was concerned and the result, the satisfaction did not find any excuse for not jumping to its collection bag!
This article was prepared for you by Parasuraman Subramanian from India. He is 72 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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You may check on his previous repair article below:
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9 Comments
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Albert van Bemmelen
April 26, 2021 at 7:34 pm
I take it that you just replaced the stereo 2 x 3 pin potentiometer and added it to the 8 pin input connection/the 8 pin adapterboard, or just wired the connections in such way without any board if that adapterboard was not there anymore. Thanks for sharing.
Parasuraman S
April 26, 2021 at 11:02 pm
I wired it to the board as it should be, following the circuit and removed the 2x3 pin. Many thanks for your comments!
Eurico Barradas
April 27, 2021 at 8:07 am
You are right. The extra pin is used for the loudness knob control circuit.
Parasuraman S
April 27, 2021 at 1:35 pm
Yes, dear! Many thanks for your comments!
Waleed Rishmawi
April 27, 2021 at 5:00 pm
I just love it when there is schematics available; makes everything easy and clear to do. good job on the repair and thanks for sharing
Parasuraman S
April 28, 2021 at 12:26 am
Yes, dear! Many thanks for your comments!
Yogesh Panchal
April 28, 2021 at 4:23 pm
Good JOB! Sir
Humberto
April 29, 2021 at 11:22 pm
Good job Parasuraman.
Viswa
August 4, 2022 at 4:35 am
Hello sir, i want to replace the broken volume control in my Pioneer A400. It is a 9 leg volume control which is NLA from pioneer. Can you help plse