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Alex Audio Video and Computer Service
Alex Audio Video and Computer Service's posts


05/27/2015 EDIT
Marantz 2285B Stereo Receiver
Beautifull Marantz 2285B Stereo Receiver
Cleaning of vintage receivers and amps 1970 to 1980. It is not a small and easy job. Even basic cleaning will take you 3-6 hours and most likely will not be done correctly. If you are not experienced do not start because it looks easier but becomes complicated very fast.

Cleaning of Vintage Receivers preparation

Before you start cleaning controls and switches turn off the unit and unplug electrical cord!
Warning never ever spray cleaning solution on boards when unit is turned on you will short circuit and have expensive repair bill.
You can do a good job or destroy your receiver or amp very easily and electrocute yourself.
Dust will not affect performance of your receivers or amps and oxidation will. 30-40 year old vintage receiver need extensive DeoxIT D5 cleaning and Deoxit Faderlube for lubrication.
You can cosmetically clean unit using compressor, compressed air, denature alcohol preferably 91 to 99% and q-tips to clean parts and DeoxIT D5 (red ) contact cleaners to clean switches and DeoxIT Faderlube F5 (green) for lubrication
Remove top and bottom put screws in small bags and attach related screws to top and bottom covers so you put back right screws to right places.
You have to remove knobs and front panel for cleaning and create access to controls and switches. Note some knobs secured by screws especially tuning and volume knob you need long allen wrench 1.5mm-2.5mm.
Do not force because you may break control or switch. Inspect cereful and if you see a hole on the side of knob you have a security screw inside.
Cleaning of Vintage Receivers and what do you need?

Can or 2 of compressed air or Compressor to blow dust.
Small to medium paint brush to clean dust inside you must be very careful not to bend or damage any parts.
Here I am redy for cleaning Pioneer SX-1250 receiver controls and switches.
Cleaning Pioneer receiver controls and switches.Note you need Allen wrench 2mm to remove knobs and front panel to get excess to controls and switches each model deferent so you most likely need remove control panels.
Note do not spray in front off controls it will never solve the problems.
DeoxIT D5S6 Contact Cleaner + F5S-H6 Faderlubing bundle $29.95 & free shipping. ( Amazon)
For Controls and Switches you need DeoxIT D5 cleaner and it-is expensive.
For cleaning use CAIG DeoxIT D5S6 DeoxIT Solution Spray, 5% spray 5oz.
For lubrication use F5S-H6 CAIG DeoxIT Fade lube – 5 oz.
FaderLube is a Cleaner/Lubricant made by Caig specifically for potentiometers, slider or rotary controls.
Note you do not need much and must be sprayed only in controls and switches you spray on top you see small holes and inside of shaft and push in and out.

If volume control sealed soak on top and rotate after. Let seat for couple hours and repeat again repeat 2 to 3 times and let seat over night clean lust time and assemble partially together for test.
Do not spray DeoxIT or any cleaner on boards tuning capacitor or you have problems and smoke!!
Repair and Cleaning of Vintage Receivers and Amps is ours specialty give us a call we can help!

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Specifications Kenwood KR-9340
Year: 1973-74
Power output:
Full channel driven in to 8 ohm at
20 Hz to 20 kHz 40 W x 4
In to 8 ohms at 1000 Hz 44 W x 4
In to 4 ohms at 1000 Hz 55 W x 4
Tuning range: FM, MW
Frequency response: 20 Hz to 20 kHz
Total harmonic distortion: 0.5%
Damping factor: 30
Input sensitivity: 2 mV (mic), 1.5 mV (MM), 150 mV (DIN), 150 mV (line)
Signal to noise ratio: 60dB (mic), 60dB (MM), 75dB (DIN), 75dB (line)
Output: 150mV (line), 40mV (DIN)
Speaker load impedance: 4Ω to 16Ω
Dimensions: 534 x 162 x 360mm
Weight: 46.5 pounds
KR-9940 basically the same receiver except of power output 50W/channel.

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What you should know about Cleaning of Vintage Receivers and Amps!

Post has attachment new customer service representative Basil is a result of real estate taxes that have doubled in 4 years and some layoffs. He will always greet you with handshake or a bark. He has moved up to using the mouse instead of eating it. Desperate times call for desperate measures! Please come and visit us. 

Poor speaker wires connections can damage yours amp or receiver. 

Very bad wires Speaker wires may be the most common culprit to damaged speakers, receivers and amps. Many people using heavy gauge speaker wires do not properly trim and have “whiskers” which could touch each other.
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