When buying my Heathkit IM18D (see here), I got this meter for a few more bucks. It was very dirty and was sold as not working. Also, someone has poured some silver paint over the poor device… Heathkit V-7A after some cleaning (knobs were in dishwasher when I took that photo) Some strange kind of line connector was found (this is a DIN connector, and I suppose someone had a cable that was used to put 230 volts in here…)
When entering the area of old tube receiver repairment, I found that a signal tracer device is crucial. With this device, you can trace a signal in the stages of the radio device and identify the stage that is not working anymore, so it is a great tool to troubleshoot radio receivers. Grundig SV41 signal tracer Signal tracers are not produced anymore, I think they passed when receivers and amplifiers were designed with ICs, where you have multiple or all stages of an electronic circuit in a single chip.
Having 3 tube radios from 1950 .. 1960ies, I though it’s time to also have a tube tester. You can have the simple ones, but also a lab level device. All these tube testers come from 1950 .. 1960 years. You can have one for european tubes only or more general ones with american and european tubes. So I decided to get an american version. All modern amplifier tubes are american brand, so this is a good approach.
To experiment with tubes, a power supply that creates higher voltages is required. Most lab power supplies supply up to 30, maybe 50 volts, some older ones may even go up to 100 volts. While tubes operate already somehow at these values, for testing etc., I looked for a real tube power suppy. I found one from an older german company, called NEVA. As far as I can see, they mostly produced for universities and school labs.
I bought this radio as defect, does not play for some euros. It had no power plug anymore, and my initial idea was to tear it apart to salvage the ancient parts used in the 50ies. Radio after minor repair work The wooden case was in quite good condition and all switches and knobs were present. So I decided to check for the issues in the radio and maybe repair it.
East german product. With tube technology. From 50ies. Obsolete, Outdated. Unhip? The root of all this came from Corona agony. I thought: Why not to look again to tube technology? Device after cleanup and fixing Last year a friend gave me an old tube radio as a gift. I love the sound of this small Lowe Opta Bella Luxus and handled it like a religious device, e.g. the Bundeslade. Time passed and I thought: why not getting another tube radio.
M-Audio sold around 2003 this MIDI keyboard. Besides the 2 octave keyboard it offers also an external USB Sound card with many audio connections. Moreover it offers controls to control a DAW application. Target Operating System were Mac and Windows. I got such a keyboard in 2020 and tried to use it with Linux. This is possible and I describe here what has to be done. The connectivity between Keyboard and PC is USB, with version 1.
Einleitung Dieses kleine Büchlein soll dem verständigen Wandersfreund, und da insbesondere dem angehenden Wanderbegeisterten, der vielleicht zum erstem Male einen Aufenthalt in den Bergen plant, alles notwendige für erfolgreiche Touren in der faszinierenden Bergwelt mit auf den Weg geben. Das Büchlein möchte auch insbesondere aus der Praxis heraus berichten. Damit unterscheidet es sich wohltuend von vielen, scheinbar ähnelnden Werken. Diese gehen allzu oft mit wohlmeinender, im Grunde jedoch unnötiger und übertriebener Vorsicht an das Thema heran.
After having revived a HP E1498 VXI controller, which is a VXI Slot sized version of a HP9000 UNIX workstation from the late 90ies of the last century (LINK and the revival of a military use Subsonic analysis VME mainframe, it was only a question of time and opportunity to start the next computer history project. The opportunity came in March 2018. Someone at eBay sold several new old stock Spectrum Analyzers.
[Den folgenden Text habe ich während einer Dienstreise 2002 aufgeschrieben. Die Fotos wurden noch mit einer Analog-Kamera gemacht.] Wie schon in Miami und San Francisco fallen mir die vielen Obdachlosen extrem auf. Wegen der sehr milden Witterung (im Winter kaum unter 10° C) ist Obdachlos-Sein einfacher als bei uns. Die Obdachlosen sind deutlich zu erkennen, weil ungepflegt und oft mit schmutziger Kleidung. Es sind meist Männer, das Alter liegt wohl zwischen 30 und 60, die meisten würde ich auf um die 40 schätzen.