Article #3 | 16:10 PM Wednesday 13/01/2016

BOSE 601 Series 1: Woodwork - Part 1

First I have made a list of materials that I need in order to perform mechanical woodwork on these speakers. Surgical gloves, 90% purity technical alcohol solution, wood filler, wood stain, stain applicator, and elbow grease. While I have the former ingredient, I had to take a quick trip to the hardware store to buy the other stuff. The 601 Series 1 has a real walnut veneer so I bought a can of walnut wood stain.

Anyway, here is one speaker in it's original state. A dent, a minor scratch, the usual signs of age. Overall in good condition. In my hurry, I forgot to take pictures of both speakers side by side.

Interestingly enough, the cloth grilles are held in place by small wood nails. I don't agree with this method. I am thinking to upgrade to hook and loop fastener. This is also known as Velcro. Or something else if I find a better solution. I will see as I make progress.

Cleaning of the silicone film and stains proved to be really difficult. At first, I tried standard cleaning solutions. None worked as expected. So I took the technical alcohol solution and soaked a cotton cloth with it. I rubbed the veneer real hard until the silicone eventually gave up. Not completely, but I weakened it. Then I took an abrasive kitchen sponge and further rubbed the veneer. This helped cleaning the hardened greasy stuff. Then more alcohol and more elbow grease. For one side, it took me about 30 minutes of hard working. But it came clean.

I repaired the missing chunks with the wood filler. But as it turned out, it is too light stained. I need to find a solution to darken this thing a little. I am thinking about mixing some filler with stain in a recipient then apply the resulting paste to the speaker cabinets. I am going to experiment a little. Otherwise, I need to insist with the wood stain on the repaired portions. Other than this, the grain looks good.

Here is how the walnut wood stain looks and how the cleaned bare walnut veneer looks like. The stain will eventually dry out in about 4 hours and will loose the glossy finish. Which is exactly what I am aiming to obtain.

Left margin stained, right margin not even cleaned.

Left side stained, waiting to dry out.

In the meantime, the wood stain has dried out and the results are looking promising already. I need to do another application after 48 hours or so. That will be the last finishing coat.

This is the first time ever that I am doing woodwork. I learned everything from tutorials. Now I need to see if my work raises up to my expectancies. Anyway, let's continue with the cleaning of the other side of the speaker. Then repairing and staining. Some work, eh? This is not for the instant gratification dependent folks.

More elbow grease on the other side produced these results.

Article #2 | 03:35 PM Saturday 16/01/2016

BOSE 601 Series 1: Technical Data

This speaker system has the following technical characteristics.

Power20 W
Impedance8 Ω
Frequency Response35 Hz - 20.000 Hz
Sound Pressure Level (SPL)90 dB
Dimensions / Weight381 mm (H), 331 mm (W), 648 mm (D) / 16.3 kg each

Article #1 | 07:12 PM Wednesday 13/01/2016

BOSE 601 Series 1: Introduction

In this documentary, I will be logging the work I'm doing to restore these speakers.

When I got them, they were in a fairly good optical state and were singing music. A good sign, I said. The bass driver surrounds must have been changed in the past. When I proceeded to remove the cloth grilles, the surrounds were changed, indeed. But the work was done in a hurry. Signs of dirt, parts of the old surrounds everywhere, a real mess.

The wooden cases are ultra dirty. Someone has been manipulating them with silicone-dirty hands. There are silicone stains and an ultra-thin silicone film all over. Again, a mess. I will have to remove this sucker first.

I didn't got the drivers out, yet. But I'm supposing the crossovers might need a little work as well. I know it from experience. This model had some issues with the ceramic wire-wound resistor and probably the lamp. Yes, they have a little lamp inside. Speaker magnets, afraid of the dark, that is. Seriously though, the lamp is used as a resistor. We will find out eventually. I need to take one step at a time. Otherwise, I am risking making a mess too.

So, let's begin!