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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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24 Followers
66 Following
19 Projects
114 Likes
  • Projects 19
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  • Contributions 1
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  • Hackerspaces 1
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  • Pages 6
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  • Following 164
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  • Bits 13
keri-szafir
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Who I Am

I've been building electronics for most of my life... Vacuum tube amps (guitar & hi-fi), vintage gear restorations, audio stuff, test gear, automation, fun projects etc. both for myself and for an occassional customer. I own and run Keritech Electronics - my little lab in the center of Gdańsk, Poland, where I live and work. I'm also a mechanic who knows a thing or two on operating and maintaining Monotype typecasting machines. Open to collaborations.

Why I'm on Hackaday.io

For getting out of my tiny lab to the broader world! Your regular mad scientist's plot to conquer the world.

electronics audio Vacuum tube studio gear amplifiers raspberry pi arduino home automation electrical engineering python C gnu/linux
  • Twitter
  • GitHub
  • Youtube
  • Patreon

This user joined on 12/21/2021.

Proud member of

Hackerspace Pomorze

My Projects

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

Keritech AC-1 Audio Computer

keri-szafirKeri Szafir

7.8k
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5
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A single-ended tube stereo amplifier with a modern technology twist
Project Owner Contributor

Keritech "Little Red Devil" Single-Ended EL84 Amp

keri-szafirKeri Szafir

881
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An automatic vacuum tube tester built around the AVT5229 board
Project Owner Contributor

Keritech P-5229/1 vacuum tube tester

keri-szafirKeri Szafir

1.4k
8
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13
Recombobulating a 1970s vintage digital electronic calculator from Eastern Germany
Project Owner Contributor

Soemtron ETR220 Restoration Project

keri-szafirKeri Szafir

123
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Combining a Nixie milivoltmeter and an arbitrary number of manually switched LM35 temperature sensors.
Project Owner Contributor

ThermoNIX Multi-Channel Thermometer

keri-szafirKeri Szafir

942
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Adding a WiFi, NTP and MQTT remote control & measurement unit to a storage heater.
Project Owner Contributor

IoT Storage Water Heater Control

keri-szafirKeri Szafir

View all 19 projects

Projects I Contribute To

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15
Play Music ? Like Music? Hack Music? Lets hangout and chat!
Project Owner Contributor

Music Chat!

avrAVR

My Hackerspaces

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

Hackerspace Pomorze

keri-szafirKeri 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

  • Supplyframe DesignLab: 2023 Hackada…
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A different approach for a solar tracker, alternative movements, to be installed on the outside, to optimize the efficiency of solar panels
Project Owner Contributor

mysoltrk - a solar tracker, reinvented

fulvioFulvio

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13
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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.
Project Owner Contributor

Apollo Saturn V and LUT

wglasfordwglasford

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

Reverse Engineering an Apollo-Era Circuit Card

skyhawksonSkyhawkson

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

PERSEUS-9 2023 Update

mitsuru-yamadaMitsuru Yamada

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Finally!
Project Owner Contributor

3D Printed Selectric Typeballs

sam-ettingerSam Ettinger

2k
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This is a tube amp build using only the 5V supply of a USB connector.
Project Owner Contributor

Battery tube amp using only 5V USB power

jgJ.G.

1.8k
32
6
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My not so fancy example of Magnetic Core Memory using fairly cheap cores and free parts from my junk box.
Project Owner Contributor

Magnetic Core Memory The Dr Cockroach Way

dr-cockroachDr. Cockroach

1.6k
8
7
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A vacuum tube computer without semiconductors, 4-bit Von Neumann, 4096 words core memory, graphics output
Project Owner Contributor

GLASNOST Vacuum Tube Computer

paul-kocylaPaul Kocyla

1.2k
12
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An 8 line by 3 trunk telephone exchange
Project Owner Contributor

Mockingbird Telephone Exchange

stevesteve

925
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Recycled LEDs improve my Clock
Project Owner Contributor

Update to an Ancient Electronic Display

david-christiansonDavid Christianson

903
7
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Intel 4004 single board computer running calculator program, VTL interpreter, 8080 emulator, and so on
Project Owner Contributor

Intel 4004 Homebrew Computer

ryo-mukaiRyo Mukai

843
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10
Just doing some restoration on vintage synthesizers
Project Owner Contributor

Synth Restoration

quinnQuinn

838
5
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This article presents an actual operation and internal circuitry of my own Digital Sampler in 1979.
Project Owner Contributor

Homebrew Digital Sampler in 1979

mitsuru-yamadaMitsuru Yamada

600
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My entry to the 2024 business card contest, a big-muff guitar pedal in a business card form factor !
Project Owner Contributor

Party in the front, business in the back

chloe-chateauChloe CHATEAU

422
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My long journey to understanding the architecture and fixing what ended up being a trivial resistor failure.
Project Owner Contributor

Fixing a Fluke 412b High Voltage Supply

collin-matthewsCollin Matthews

322
3
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This is a Mashup of a 1903 and a 1988 typewriters. They become my version of a Teletype and Steampunk printer.
Project Owner Contributor

Victorian Teletype

daniel-rossDaniel Ross

286
4
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Utilizing a low cost electrophoresis high voltage supply and DMMs to test a rare Powertube for use in Fluke regulated power supplies.
Project Owner Contributor

Simple Vacuum Tube Tester

collin-matthewsCollin Matthews

260
3
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An Arduino compatible board for Polish Makers
Project Owner Contributor

Polduino UNO

szymorszymor

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

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.

  Are you sure? yes | no

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

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!

  Are you sure? yes | no

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

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.

  Are you sure? yes | no

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

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.

  Are you sure? yes | no

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

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.

  Are you sure? yes | no

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

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

  Are you sure? yes | no

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

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.

  Are you sure? yes | no

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

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.

  Are you sure? yes | no

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

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

  Are you sure? yes | no

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

Thanks for liking #6 segments suffice !

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

  Are you sure? yes | no

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

An AL4, old European side contact power pentode.

  Are you sure? yes | no

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

Wow, respect! Way older than me too.

  Are you sure? yes | no

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

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

  Are you sure? yes | no

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