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  Notes from the Service Shop
A fictional series by John Reinicke

Chapter 1 | Chapter 2 | Chapter 3 | Chapter 4

Chapter 1

It will probably turn to snow! I was thinking to myself as I drove toward Centerburg. The late November rain was coming down harder and I marveled the wind was strong enough to lift some of the sodden leaves. The few brilliant leaves left on the trees along with the wind borne leaves made for a fireworks explosion against the darkening skies. An occasional rattle of sleet against the windshield furthered my doubt of being out on a day like this. Perhaps there were better things I could do with my Saturday.

My friend Marc had called me on Tuesday to let me know that he had been named executor of an estate and that estate included a building in Centerburg. He had called me because he knew of my interest in old electronics devices and he thought this building had housed a Radio/TV repair shop at one time. The shop had apparently closed in the late 60's and was long gone but he thought the attic might contain some remnants that would be of interest to me. The opportunity to rummage through some dusty old electronics could not be denied and so I was now making my way in the rain.

Centerburg is one of those small Midwestern towns that grew up at the end of the last century. A cluster of frame, Victorian buildings surrounding a town square complete with fountain and the various war memorials starting with the Civil War, makes up the heart of the downtown area. The peak of the prosperity has clearly passed, but, since there is no WalMart, the downtown still enjoys a modicum of business activity. The buildings are well maintained and still retain their Victorian appearance. The building Marc had called about was just off the square on High Street.

As I turned the car away from the square I made two happy discoveries. First, I could see Marc's car parked in front of the building and, second, there was a parking spot in front of the building, thus reducing my dash through the rain. I parked the car, jumped the puddle at the curb, and ducked into the recess for the front door. Marc was waiting and let me in. The gray light from the large windows on either side of the door did little to improve the appearance of the inside. No lights and slight heat did not help displace the gloom. The front store room was empty except for some paper debris on the floor. The walls were a multicolored collage left as the various store keepers had painted only up to their shelving units. The only positive note was the tin ceiling was in excellent condition and provided a hint of the previous appearance of the building. I thought; This does not look hopeful.

Seeing the expression on my face, Marc smiled and pointed to the front window. There, next to the door was a decal of a man running with a Tung Sol tube caddy and the text; Radio Television Repair. I had not seen the sign in my haste to enter. I thanked Marc for meeting me and for the warm greeting. We then walked to the back of the shop. In the back room, along one wall, was an Oak service console like those I had seen in Radio Craft from the 30's. Next to the back door, which opened to the alley behind, were the steps upstairs. The single staircase opened both to the shop and the alley and provided access to the apartments upstairs. The apartments were vacant due modern fire requirements for two staircases. We proceeded up the steps.

At one end of the hallway for the apartments was a door with a hasp and a padlock. Marc opened the lock and the door to reveal the stairs to the attic. The layer of dust indicated this was certainly the way not traveled and the lack of footprints in the dust indicated this door had not been opened for a considerable interval. To our amazement the light switch, a rotary affair with exposed wire, was functional as were the lights in the attic. We climbed the steep stairway, each step making a faint scraping sound in the dust.

At the top we were confronted with a room that ran the length of the building. The steep slope of the roof made for quite a large room with a window at the front and the back. The rafters were dark with age and returned little light from the bare bulbs in hanging sockets. A couple of the bulbs were the old carbon filament type indicating this was, very likely, original wiring. The rain and sleet on the roof provided the appropriate background sounds for the setting before us.

A set of shelves ran down the center of the room and the shelves were full. The steep roof allowed for large piles of stuff to be stored almost to the bottom of the rafters. Aisles ran on either side of the shelves from end to end. Marc handed me a flashlight and we began our exploration.

As we looked Marc explained the owner of the building thought the shop had been called Centerburg Radio Service and had been run by one Clemens Mettmann, a German immigrant, starting in the early 20's. Apparently he was competent and collected a large customer base. By the 50's, ol' Clem had a reputation for honesty and for reasonable repairs and if it ran on electricity he would repair it. In a addition to radios he would repair everything from TV's to toasters.

As Marc and I explored the shelves and the piles it was apparent if a customer didn't return to collect the repaired item, ol' Clem would put it up here on a shelf. Since he had been in business a long time, there was an enormous collection starting with the late 20's running into the television era. In addition to unclaimed repair items, there were numerous pieces of test equipment old display items and old signs. As we made our way to the front Marc and I realized some of the items could be valuable.

At the front of the building was yet another discovery. Ol' Clem had a small office up here. There was an old roll top desk -- a museum piece itself, several oak filing cabinets, and bookshelves. The bookshelves contained the technical literature that he wasn't using on a regular basis. So here is where the Rider's wound up along with a lot of manufacturers information. The SAM's folders must have been with the modern equipment that was sold with the shop when Clem retired, for they were not in evidence. To this point the enormity of the collection had so overwhelmed Marc and Me that we hadn't even touched anything as if we had encountered a museum.

Curiosity overcame the awe and I opened one of the file cabinets. It appeared that in addition to being a good technician, Clem had also been a great chronicler and the file cabinets contained a sort of technical diary, a running commentary on his activities and notes on how he had managed to repair a number of items. So there were folders for components, folders for manufacturers, folders for comments, folders for vendors, and even a folder for repairs on his various personal automobiles. I removed a folder, making note of it's location in the file, dusted off the chair next to the desk with an old rag and sat by the desk, next to the window, to see what was inside.

In 1943 parts were in short supply due to the war effort and Clem had been taking extra efforts to repair things that normally would be replaced since the replacements were not available. This situation would be familiar to the modern collector, I thought to myself. This folder showed how to repair potentiometers that were used as volume and tone controls in old radios. It even had some sketches next to the notes.

Here are some of his ideas along with some of my comments, all of which may work for the collector.

  • For a noisy pot (volume control or tone control) use an eyedropper and a capillary tube to drop alcohol into the pot. For a capillary tube we can use one of those red tubes that come on cans of WD40 or spray freeze. Work the pot back and forth and check the results. He correctly observed this should be done with the unit unplugged and the radio should not be energized until the alcohol had evaporated. (fire hazard) He had also discovered that Carbon Tetrachloride was too aggressive a cleaner and would, at times, remove the carbon trace from the pot. We know today that humans should NEVER be around Carbon Tet (they didn't realize how toxic the stuff was) and the advice -- don't use aggressive cleaners on the resistance surface -- applies to aggressive cleaners of today such as SpraClean or other contact cleaners.
The following repairs required the pot be removed from the set. Clem recommended making a sketch of wire routing to facilitate reconnection (I think he saved all of them in the files!) and he used dental tools to help separate the wires. He got his dental tools after they broke at the dentist and he would grind new ends. I have found them to be useful as well, even on printed circuit boards, and they are available at Army-Navy Surplus places. I can't help but wonder how much Clem would have liked a modern solder sucker for the chore -- they do the job well.

  1. If the pot was stuck or was very hard to move because the grease had set up or it was rusty, He would remove the small C washer at the front. This can be done with two screwdrivers by using the blades in opposition. The back can be removed by prying up on the tabs. He had a special tool he made from a broken pocket knife for this one. He ground the blade to about a quarter inch in length and would use this as a pry. I have found a small diagonal cutter will work as well.

    Once the back was off, the armature can be removed. The surfaces can be gently cleaned with alcohol. The metal parts can be cleaned with spray clean or paint solvent (you can guess what Clem used!) Just be sure to keep the aggressive cleaners away from the resistor surface.

    When he was done, he would lubricate the whole thing, including the resistance surface with a very thin layer of Vaseline. I think this is still good advice, but I use a thin very layer of silicone grease. Silicone grease does not break down like Vaseline.

    A pair of pliers can be used to bend the tabs back and to close the C washer.

  2. If the connections were open, he would use some silver paint to bridge from the contact to the resistor element. He got his silver paint from someone he knew who did the burglar alarm tape on windows. You can get it at electronics supply houses.

  3. The same silver paint can be used to bridge open spots in the resistor element. Clem would also bridge open spots with an HB pencil by just writing on the crack and the graphite in the "lead" would bridge the gap. I think the silver paint is probably a good idea, I don't know how long the pencil would last. Be sure the silver paint is dry before working the pot -- a smear would be a disaster.

  4. In some cases the contacts would wear through the resistor surface and leave ruts with no contact. In this case he would simply bend the wiper to run on the remaining element.

  5. For cleaning Clem used Q-tips.

  6. When he returned a pot to a radio, he assumed he would have to remove it at some later date, so he would insert the wires straight in the holes and solder. He would not wrap the wire around the posts so they could just be heated and pulled straight out.

After noting these hints, I returned the folder to the file cabinet. Marc had been exploring further as I looked over the notes and was quite engrossed in the many items in the attic. I will enjoy reporting on these in later articles.

The collection had proved so interesting to explore, Marc and I lost track of the time, nor did we notice that the sound on the roof had stopped. When we realized how late it had become, knowing we must be on our way, we looked out the window and discovered it had started to get dark and, indeed, it had turned to snow!

Chapter 2

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