Marshall JCM 800 2203 Guitar Amp - Tube Swap and Re-Biasing

Chris from Cornerstone joins us again for this Marshall re-biasing video.  This is an all original JCM 800 - 2203 that is receiving new tubes all around.

Click Here for more........

Heathkit T4 Signal Tracer Guitar Amp Project

Ive Taken a damaged Model T4 signal tracer and converted it to a small tube amp for a guitar, set up like a gibson GA8-A except it uses the original Beam power tube for the finals. 

Click here for more info !!! 

Amiga 500 Turn-up after 20 years

Here is my collection of movies and information on the turn-up of my Amiga 500 after sitting in storage for 25+ years.



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Adventures with the Heathkit IT-12 Harmonic Distortion Meter

My collection of projects that relate to the repair, restoration and operation of Heathkit IT-12 test devices.

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Telefunken Concertino 7 Repair Series

This series documents the repair of my Telefunken Concertino 7 Radio which supported FM VHF AM Shortwave Longwave as well as many surprising features for a 1950's radio.   I had cosmetically restored this radio in Germany but had never done any electronic restoration.


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Yamaha 650 Quick Carburetor Clean / Repair Series

Seems to be given any amount of time that the jets in the emulsion tube of each carb will clog causing the engine to die just off idle.  Even if the carbs are perfectly clean, this issue causes an interesting closure to form, a perfect circle which reduces the jet size in a uniform fashion.  For these situations it is not necessary to remove the carbs from the bike, and a quick clean of these particular jets can be accomplished.

This Three part series described the whole procedure in detail

Commodore 64 Halloween special - Power supplies of Death

This is my attempt at special effects.   Something you will be surprised to know that I don't do professionally.  I do however know a crappy ass power supply when I see one.   You will however find within the video that although both the top and bottom of the sine wave is employed in the rectification for DC I make an observation strictly from a parts perspective (or lack thereof) with regard to their missing diodes, versus a 4 diode bridge rectifier.  All across the internet Pocket protectors spontaneously combusted, slide rules exploded.  Good thing I don't discuss Politics here.  The internet is a rough place, even in ubergeekdom.

So click Here for some Halloween fun and commodore mayhem

The FLDIGI to FT817 QRP Station Video Series has arrived

This video series demonstrates how easily a QRP station can be set up with a minimum amount of hardware.  Using an FT-817, a linux laptop and a Buddipole antenna we go through step by step from the beginning all the way through to completion.

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Marshall 6100LM Anniversary Series super quick Bias repair

Posed with the issue of having to do the bare minimum to fix the problem, i'm joined by special guest star Kris from Cornerstone music as we try to determine the best way to stop output tubes from exploding in this amplifier.


Click here for more info. 

Super Serial Switch Setting Status

     Ok, So I thought i'd bring this all together and try out just a few more tricks before moving onto something more comprehensive.  Having automatically identified the slot assignment and storing the value in zp SLOT $07 we can do some useful things with it Like retrieve and decode the status of the dip switches on the Super serial card.

Click here for this next Apple II project that i've assembled.

VW / Porsche VDO Clock repair

This clock came out of Johns mid 70's Westfailia bus.  When I had received it it was non operational though I was advised that an attempt was made to replace the two electrolytic capacitors as recommended on a website.  This is where the adventure begins.

Click here for more info. 

Super Serial Makes a Personal Discovery

   This seems like the next possible task for such a device. I've kept a yellow post-it note under the monitor with a listing of what card resides in which slot and have often lost it. Having to then remove the monitor to retake inventory of the system.  This seemed like a good time for the next evolution of code, definitely not as complicated as the IRQ issue, but requiring some thought, none the less.

    In the next project we auto detect the SSC card and store the slot

Super Simple Super Serial Sample Source

     I have struggled to find the most basic of information about Apple II related machine coding information. Its not as freely available as people would like to have themselves believe it is. In searching, having often found the same struggles of others in the past, some who had given up years ago for lack of understanding or availability of information. While that is subjective, there is as it seems, a complete black hole with regard to several facets of the platform

Click here to see the Apple II project I have started with regard to the SSC

Fender Reverb Deluxe

Fender Reverb deluxe Repair and refresh. This amp was in mint condition and just required age related service.






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Danelectro Model 272

Nice sounding AMP, when it works, weird design, low quality parts and built like a deathtrap.  Very interesting.....

Click here for more info.....

1959 Gibsonette GA-8

Awesome simple single ended Gibsonette 6V6 amplifier from 1959. Initially arrived at my door broken because one filter cap had shorted and caused a fire which burned through the other filter cap.  


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Collection of APRS and packet software installations on linux

Here are Some videos Ive posted on Youtube that include some HAM radio experimentation work done in the April-May timeframe.  Also included is some FREEDV digital voice work.

Click here for more.......... 

TAPR TNC-1 restoration

Restoration and operation of the TNC-1


The first generation Packet TNC is going back online using the venerable Apple][.     No content yet but some photos in the link here

Commodore 64 (board REV C) and older 1541 replacement capacitors from Newark (Element 14)

At this point, any electrolytics in the Commodore are suspect.  Since replacement is so cheap, and failure so expensive, Ive compiled a list for Newark (Element 14) for capacitor replacement.

Click here for more info

The Adventures in repair and recalibration of the HP 331A

Here is my information on the repair and calibration of the HP 331A THD analyzer from the 1960's which is now in working condition and on the bench


Link to My post in EEVBLOG

Heres the Movie on Youtube