Opvangtehuis voor buizenbakken
I found an other little project. This “walkman” is a mono cassette-recorder/player. It has 1 knob recording, adjustable bandspeed and a speaker. I think it was more a dictaphone then walkman. It still looks like new but needs some TLC. I still have a bunch of cassettes I taped in the 80’s from the radio. … Read more
This is a very cute portable CD-player made, if I’m correct, in 1992. After years of for most commercial repair I wanted to do some fun stuff in between. No hurry, no need to succeed, just relaxing repairs. I volunteer at the Salvation Army thrift-store and this beauty landed on my desk to test before … Read more
Some thoughts on hot air soldering equipment A hot-air station has 2 main parts. The heater and the blower. The heater is always in the handpiece and its function is to heat the air that flows through or over it. The big difference between stations is how well the heater is able to heat the … Read more
I made the mistake of buying a Metcal MFR 1351. The first problem was you can not use the soldering iron and desolder iron at the same time. So it is not a real dual powersupply. The desolder tips are very fragile. The inner tube get loose from the sleeve and then they are not … Read more
While repairing I sometimes make pictures from front and back PCB and then use the gimp to overlay them but this time I played around a bit further just for fun. It now looks like an aquarel drawing. And this is just one side:
This is an Infratek 103A Wattmeter. It is made in Switzerland and measures power over a very wide range. I do not have a manual so I do not know the specs. It is a 6 digit meteer. It can measure AC+DC upto 50A and 1000V. If someone has a manual, I would be very … Read more
The way I store my components. This way I can place the boxes with parts I need on my desk. Behind these boxes I store my tubes, sorted by prefix. Here I store bigger parts. Behind these boxes I store more boxes. These boxes left are for cables/wires. I sorted them on size and type. … Read more
While probing a circuit it is handy if you can stabilize it so it does not dragged over the table edge by the weight of probes and other wire connections. There are a lot of solutions for sale but I wanted an allround one that also can hold small enclosures or used as a third … Read more
This cute little lathe I bought many years ago. I made this setup on a little car so it is ready for use when I need it. It came with a lot of extras. I replaced the motor by a bigger one from an Unimat compact 5. This because the original get very hot. The … Read more
I have build this 3D printer. I want to use it to make cabinets, knobs etc. I made some modifications like copper washers between the extruder parts to prevent leaking. The pcb holds the thermistor. That way it is safer , protected and using thermal paste it works better. http://www.pa4tim.nl/wp-content/uploads/2015/10/printerelectronica2.jpg The tumbwheels construction was very … Read more
This writer I got from Florick. It is not working (yet) First I have to find a fan, penholder, a manual and schematic. It should be from the 60’s. Moseley was a department of HP. Update: These schematics are scanned for me by a French 135 owner. The 135 works, choppers and motors work … Read more
In rather bad shape, it was played until it stopped. Some burned coils, stuck rotors and very dirty. The playfield has no glass. The doodle bug is missing, instead a motor and blinking light. All rubbers are worn, flippers worn. One popper mechanism missing. And a lot of things more. But it was for Free … Read more
To have a reference while repairing the 9100B the owner brought his very nice looking, but also not working 9100A. This is the first version. The processor seems to be working. You can test this keying : 1 CHS Squareroot. This activates the error light. But the tube stayed dark so first thing I … Read more
This is a report of progress made for the owner during the repair of a HP-9100B calculator. There are no microprocessors in side. It is one of the most famous calculators ever made. The first scientific calculator. I have no clue if it will succeed. It is in unknown and very bad condition. A thing … Read more
To calculate in style. The Hewlett-Packard HP-35 was the first pocket size scientific calculator in the world. This indirect killed the sliderule. It uses RPN, reverse polish notation. It is made from 1972 to 1975. Introduction price was around 400 Dollar. It first was named the calculator but later Bill Hewlett gave it the name … Read more
The most easy way to clean dirty pots, knops, switches, connecters ect is ultrasonic cleaning. In basic, the soundwaves form tiny bubbles that implode to the surface. The implosion sucks the dirt out of the material. I first had a simple 30 euro version but results were not great. It improved using hot fluid and … Read more
Wat doe je als het een regenvakantie is en het vakantiehuisje een kamer over heeft, juist, solderen Helaas had ik de freesjes van mijn gewone 230V dremel meegenomen en die paste niet in de 12V versie, dus dan wordt smd verwerken wat lastig. Dit wordt overigens een uOhm meter. Tweede stap: Op de kisten staat … Read more
Knowledge does not come by itself, beside internet there are curious things named books. They are a good source of knowledge. This is a part of my collection. The concepts range from Tektronix, made in the 60’s. On the picture a few of them. I have almost the complete series. PDF’s can be found on … Read more
De eerste transistors waren gemaakt van germanium. Dat spul (uit rij 4) werd vervuild met een element een stapje hoger dan wel lager uit het periodiek systeem (rij 3 of 5) bv gallium of arsenium en was een echt half geleidend materiaal. Het heeft weerstand. Als je een metaal verwarmd wordt de weerstand hoger maar … Read more
Deze keyer kreeg ik kado van Jos, PA0AMX. Het is een heathkit HD-10 keyer/morse sounder. Deze zijn er waarschijnlijk ongeveer 50.000 gemaakt. Zo’ n 10 jaar vanaf halverwege de jaren 60. Je kan er transceivers mee sleutelen die negatief naar massa schakelen. Buizensets dus. Maar met wat creativiteit mbv reedrelais of opto couplers kan je … Read more
Als 14 of 15 jarige kreeg ik een Philips experimenteerdoos. Het boek heb ik nog maar zonder kaft. Het moet gezien het boek iets uit de EE20xx reeks zijn geweest. Ik heb de veertjes nog en die zijn echter anders dan deze. Die moest je opzij duwen en de draad er tussen klemmen. Vorig jaar … Read more
Deze set is gebruikt op het 1e christelijke lyceum in Zeist. De zendvergunning zit er nog bij. Gedateerd 1964. Ik heb twee van deze sets. Ze werken met een EL84.
Zomaar wat plaatjes van oude buizen.
Deze erg grappige speaker in een zwaar gietaluminium chassis is zo goed als zeker ex marine. In ieder geval engels en er zit een knop op zoals door murphy werd gebruikt. De knop is een volume potmeter. Er zit een trafo in en het ding sluit je aan op de 600 ohm uitgang van een … Read more
Bij het afregelen van oude radio’s ontkom je niet aan het verstellen van trimmers en spoelen. Gebruik daar NOOIT een gewone schroevendraaier voor. Ten eerste beinvloed het metaal van de schroevendraaier de capacitiet of inductie. Ten tweede kun je er heel makkelijk iets mee mollen. Beter dat je een trimsleuteltje breekt als dat je ineens … Read more