Retrobörse in Vienna 2012

Luckily I had some time last Saturday to visit the Retrobörse Wien 2012. A bunch of vintage enthusiasts and traders gathered at the Freihaus (part of TU-Wien) to chat and trade old computer games, computers and consoles. I really had to restrict myself not to buy some good condition N64 – but what would I do with it? I haven’t got no TV 😀 Entry money was 3 € which I think was okay, many people (like me) were just lurking and the cleaning lady has to be paid too.

Nevertheless I got some fine Pictures, down below some more on a really cool project aiming to get Atari into the 21st century:

My friend Markus playing some good old frogger on a system I didn’t even knew existed: the TI-99:

The one I saw in close-up. If you want to know more visit their austrian user group at

This is one classic mad in my very own country by the “Post” that held a monopoly on postal services in Austria up until the early 2000nds. Sorry folks, I didn’t catch your name. get more info on the Mupid here and here.

Atari 800 XL goodness…

.. in all its glory plus some peripherals.

And now some Atari/cpu/fpga awesomeness:

This board is here to combine vintage goodness with a modern operating system and speed (~246 MHz atm). Doesn’t sound too much eh? Well these Atari’s have been stuck @ ~5 to 40 for almost 2 decades. Still there are enthusiasts out there and I had a lengthy talk with the two guys at the stand. One of them started his own button manufacturing – all designed with native Atari software check out his ebay shop.

The Firebee has some really nice hardware on it like a cyclone III fpga and some nice freescle processor. Visit their site here (WARNING, ONLY CLICK IF YOU HAVE ONE EVENING FREE ;D). It will bring out /all/ important pins – from scsi to the old buses, to interface your 1983 Casio Keyboard or the trusty synth. Remember Homers face, when he saw that super-sweet jelly venus?……

Luxury Junk

I just couldn’t resist bidding on some ebay deal where a guy sold his cellar of HIFI-electronics.
There was /much/ more than shown here. This are the parts, I probably gonna use in some way.

JVC GR-SX9 Video Camera

Some very old (1991) Camcorder, I gotta look into connecting it do the pc to finally get some descent webcam input.

AIWA AD1250 Stereo Cassette Deck

This is some very solid case, it will probably house a synth or a mixer in the future.

Blaupunkt 60W 3 Ohm Car Speakers

Just that, they’ll go into a boom-box.

Premier CB 2000 Citizen Broadcast Radio

This one is interesting because i want to get a ham license in the near future. It does not work atm but I’m on it. the amp on top is known as a “Brenner” (afterburner) or “Oma” (grandmother) here in austria. using such an HF-amp with CB is strictly forbidden. (4W only, 12W with SSB)

Hornyphon 6391 Stereo Amplifier, front face

Hornyphon 6391 Stereo Amplifier, inside

Yeah this one needs some serious cleaning and testing but it could very well become a good mate in the future.

AE EP#34 Heathkit IG-102 RF-Signal Generator

Hi Folks,
After more than a month of video-making abstinence I finally managed to make another one.
It’s about the classic Heathkit IG-102 signal generator. 2 Tubes, the 12AT7 and the 6AN8 make up 4 oscillators (3x RF, 1x internal modulation). Some little hack at the end…

if you need some manuals I probably can help you. I can’t put up any manuals ’cause Heathkit was a little cranky about that sort of thing – so until the situation is clear, just ask.

AE EP#29 Oscilloscope Project: The heat is on!

Hi guys!

I just made up some working test setup for the homebrew oscilloscope project and the screen came to life for the first time:

Here is my setup:

By the way is the 3KP1 / DG 7-113 with the green p1 phosphor. If you ever come across the white phosphor (3kp4) you found some nice piece of rareness. The P4 version was used in the Pilot TV-37, one of the first portable TV-sets. Check out David and Marlene McClellans blog about restoring one! Also check out some video of it here.

I Just found some GDR-Amp

I got myself a little treat (10 Kg of scrap electronics) and inside I found, among other great stuff, a GDR board that was made by RFT. It seems to be some kind of stereo amp or Tone control circuitry because of its symmetric nature.

We have a 2761 Dual opamp and 4 E X3 C36 (?) transistors at work alongside 4 Styroflex(polystyrene) (you gotta love em) caps.

I asked around in my favorite forum where some old-timers hang out and that were in electronics back in the day, when there was the GDR. I’m hoping to find out some more soon and get this thing going!

AE EP#27 Gameboy Crystal Hack

robot797 asked me to play around with the clocks of gaming consoles and I liked that idea. So I think fiddeling with an N64 in that way could work but I settled with a classic Nintendo Gameboy. Turns out, that ye olde Z80 doesn’t mind the dodgy clock at all.All I needed was a rotary switch and some quartzes (2, 3.3, 4,19(original) MHz).

AE EP#22 Electron Tubes Basics & Example Amplifier Project

In this video I quickly cover the electron tubes basics and show a little tube amp project, that uses the 1T4 (DF91). The 1T4 is a low voltage tube that can be operated from 45 (it actually works with 12V too) up to 90 VDC and a heater with only 1,5 V. It is also very cheap and can be as NOS for about 0,5 to 1€.

To make more bang I just put two tubes in parallel. In my configuration the whole set-up makes about 150 mW of sound power.

Find the circuit I followed at: (german)

AE EP#21 Minerva Minola 3 Teardown

This is just a short teardown of the classic austria-made Minerva Minola 3 radio from 1967/8.

Here the promised pics:

Full front view of the Minola 3 in all its glory.


The two Varicaps:
Up: the gear to the varicap on the pcb.
Below: LW and MW system.


External speaker connector on the left, back in the middle the impedance transformer for the speaker and on the right mains transformer with fuse holder.


Front-panel switches and pcb from below.


The main board mounted on the chassis with tubes. The paper in the middle acts as a diffusor for the front panels back-light.


I’ll post an update if I ever get the schematic to fix the Volume pot.
Find out more at:
More about Minerva at:
Nice holidays to you all!

AE EP#7 Heathkit V-7A VTVM Voltmeter

This is a little vid about the classic Heathkit V-7A, predecessor of the Heathkit models IM-11 and IM-18. They all had an almost identical Circuit and were manufactured from the 50tier until the early 80ties. I am doing some little repairs on faults that came from a leaky batter and show how to measure with it.

some more info here: and on Jogis Röhrenbude you can find the manual: