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Keri Szafir

The vacuum tube witch and a vintage electronics nerd doing projects on a budget tighter than Ethel Granger's laces.

Gdańsk, PL

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This user joined on 12/21/2021.

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Hackerspace Pomorze

My Projects

Equipment power remote control, networked audio interface and a NAS for the digital music collection

Keritech AC-1 Audio Computer

keri-szafir Keri Szafir

A single-ended tube stereo amplifier with a modern technology twist

Keritech "Little Red Devil" Single-Ended EL84 Amp

keri-szafir Keri Szafir

An automatic vacuum tube tester built around the AVT5229 board

Keritech P-5229/1 vacuum tube tester

keri-szafir Keri Szafir

Recombobulating a 1970s vintage digital electronic calculator from Eastern Germany

Soemtron ETR220 Restoration Project

keri-szafir Keri Szafir

Adding a WiFi, NTP and MQTT remote control & measurement unit to a storage heater.

IoT Storage Water Heater Control

keri-szafir Keri Szafir

Combining a Nixie milivoltmeter and an arbitrary number of manually switched LM35 temperature sensors.

ThermoNIX Multi-Channel Thermometer

keri-szafir Keri Szafir

View all 19 projects

Projects I Contribute To

Play Music ? Like Music? Hack Music? Lets hangout and chat!

Music Chat!

My Hackerspaces

A space for hanging out, playing, discussing, working together and doing projects. Open days on Thursdays 18:00 local time!

Hackerspace Pomorze

keri-szafir Keri Szafir

My Pages

Vintage Polish Vacuum Tube Catalogs
05/31/2024 at 19:01 • 0 comments

Recent acquisitions in the lab: vacuum tube catalogs by Piotr Mikołajczyk, in addition to the two I already had by Leon Niemcewicz, with vast amounts of vacuum tube data. I love vintage printed catalogs, can't get enough. Enjoy!
Channel 2nd Anniversary Special
12/18/2023 at 20:30 • 0 comments
Keritech Electronics Lab Tour!
04/19/2023 at 23:04 • 0 comments

View all 6 pages

Projects I Like & Follow

This is a 1/60 scale model of the Saturn V and Launcher - Umbilical Tower. This model is huge! I have been working on it for two years.

Apollo Saturn V and LUT

This is the oldest PCB in my collection, acquired from a scrap sale at an old NASA test stand. What did it do?

Reverse Engineering an Apollo-Era Circuit Card

A smart cat bowl that uses facial recognition

Cat Bowl Monitor

New developments in planetary position calculation applications and external PROM modules for PERSEUS-9.

PERSEUS-9 2023 Update

mitsuru-yamada Mitsuru Yamada

Modern recreations of a 1898 21-segment display

SC-002

A vacuum tube computer without semiconductors, 4-bit Von Neumann, 4096 words core memory, graphics output

GLASNOST Vacuum Tube Computer

paul-kocyla Paul Kocyla

This article presents an actual operation and internal circuitry of my own Digital Sampler in 1979.

Homebrew Digital Sampler in 1979

mitsuru-yamada Mitsuru Yamada

Just doing some restoration on vintage synthesizers

Synth Restoration

An 8 line by 3 trunk telephone exchange

Mockingbird Telephone Exchange

This is an 8 bit vacuum tube computer I built using recycled 1950s Vacuum Tubes I found in Eastern Europe a few years ago.

Vacuum Tube Computer

I build a model railway controller using analog PWM & block detection with manual and automatic control, and I evaluated the passing siding.

Model Railway Controller using Analog PWM

mitsuru-yamada Mitsuru Yamada

My long journey to understanding the architecture and fixing what ended up being a trivial resistor failure.

Fixing a Fluke 412b High Voltage Supply

collin-matthews Collin Matthews

My entry to the 2024 business card contest, a big-muff guitar pedal in a business card form factor !

Party in the front, business in the back

chloe-chateau Chloe CHATEAU

Utilizing a low cost electrophoresis high voltage supply and DMMs to test a rare Powertube for use in Fluke regulated power supplies.

Simple Vacuum Tube Tester

collin-matthews Collin Matthews

I'd like to build a teletype-style terminal using an Alphacom thermal printer and a decent keyboard that will work with any RC2014

MCU-less teletype terminal using Alphacom printer

In this project, I convert a classic PCL86 single-ended tube amplifier design to operate with the less common PCL82 vacuum tube.

DIY PCL82 Tube Amplifier, Single-Ended

mircemk mircemk

An Arduino compatible board for Polish Makers

Polduino UNO

A dynamic LED fox mask

Vulpine Visage

View all

Bits

Mitsuru Yamada wrote 07/02/2026 at 01:12

Thank you for liking and following my #Model Railway Controller using Analog PWM! I think I've managed to recreate the feel of some kind of control panel from decades ago.

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Mitsuru Yamada wrote 07/01/2024 at 10:49

Thank you for liking and following my #Homebrew Digital Sampler in 1979! I remember myself back then, seeing the light dots on the analog oscilloscope screen dancing for the first time in over 40 years.

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Keri Szafir wrote 07/01/2024 at 12:02

That's a lovely project - especially for 1979! That was pretty advanced back then. I'm impressed, and I admire your build quality. Spare no expense!

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Mitsuru Yamada wrote 08/16/2023 at 23:32

Thank you for liking and following my #PERSEUS-9 2023 Update! I was able to find and fix bugs in my own floating-point interpreter by running a somewhat complicated calculation program such as astronomical calculations.

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Mitsuru Yamada wrote 03/20/2023 at 01:48

Thank you for liking and following my #Homemade Floating Point Interpreter for 6502! I recently uploaded a YouTube video of me updating the PROMs of this interpreter with my own PROM programmer. And I added a link to this video to the project.

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Mitsuru Yamada wrote 12/07/2022 at 00:17

Thank you for liking my #Prehistory of my homemade PERSEUS computers ! It was more than 40 years ago, but I have the feeling that I was quite formed in the way I am today.

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Keri Szafir wrote 12/07/2022 at 02:53

I love your Perseus computer project, and what comes with it! Beautifully made - and much appreciated.

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Mitsuru Yamada wrote 12/07/2022 at 14:21

Thank you for liking my several projects ! I make sure that my own creations have a solid housing and design to keep them in practical operation for even 10 years or more.

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Keri Szafir wrote 12/07/2022 at 15:42

That's a sign of good engineering! I'm inspired by the Cold War era electronic design, try to re-create some of that in the devices I build, using vintage components.

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Ken Yap wrote 12/06/2022 at 15:00

Thanks for liking #Restoring a Beckman neon display clock I admire its digits everyday.

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Ken Yap wrote 12/06/2022 at 04:08

Thanks for liking #6 segments suffice !

Wow, that's a really old tube you're holding. Octal base or even older?

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Keri Szafir wrote 12/06/2022 at 09:30

An AL4, old European side contact power pentode.

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Ken Yap wrote 12/06/2022 at 09:38

Wow, respect! Way older than me too.

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Keri Szafir wrote 12/06/2022 at 14:16

This one wasn't that old - 1960s or so, but the type dates back to pre-WWII times.

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