This is IPSec Tubular-well's utility site

As new applications is introduced they will be announced here.

For more information about IPSec visit ipsec.se

Blocklist over all russian networks

If you are tired of russian hackers or only want to isolate putin's murder orchs, get russian-cidr a blocklist containing 79414011 ip-adresses ( 45938433 with overlapping ranges eleminated,24 july 2023) hosted in russia and corresponding support network(s). A lot of these are registered outside russia, possibly to hide. Updated weekly.
Hosted in belarus : belarus-cidr App 2.000.000 ip . These files are updated every saturday morning.

My recent contribution : distribution of audio tubes where zero-defects, customer satisfaction and decent conditions are the goal : tubular-well.se

Building stuff for fun and without profit :

Build a Dynaco ST70 clone vta-70
( Some updates and interesting performance figures )

Rebuilding an fm-1 tuner to a linebuffer / cathode follower with a IR remote control

Refurbishing a Dynaco PAS3X with tubes4hifi powersupply board, otherwize in standard ( MINT) condition

Building a "bedroom guitar amp molly , demonstrating the use of JJ ECC99 as powertube

Building an exact tubemeasuring device aka tubetracer uTracer

An old Dynaco sca35 is refurbished

Building a riaa using design and board from valvewizard.co.uk

Building a Dynaco pas4 klon

Mixed tube documents tubedoc

Save your mailserver from spam - try spews2.manet.nu blocklist.

Some thoughts how to improve a Toyota prius

Whats in a number ? Can a number be protected by Copyright?

How can you tell when Donald Trump lies ? answer

Karl Walfridsson Minnesanteckningar En Krigares Minnen" i pdf format ( originalet tyvärr förlorat)

En artikel om Audio Innovation 800. publicerad i HiFi Answers

En artikel om Erik Andersson Även den publicerad i HiFi Answers

Vacuum Tube Vally - en intressant men avsomnad tidning Alla kända nummer 1-20