The Amp Garage

These are classic examples of "O'Briens Law"

O'Brien was the first person to realise that "Murphy " was an optimist.

I heard a voice that said "Smile, be happy things could get worse"
So I smiled and was happy and things did get worse.

Alan

You could try the SLO Clone forum. They have a messy Booger section.
They may more detail information on specific Mesa boogie amps.

Alan

Is'nt it a lovely looking cabinet.

For anyone interested, Sliicon Chip:- an Austrailian electronics hobbyist magazine has in the October 2011 edition, published a "Usb to Midi" interface. It runs from a PIC18F14K50 microcontroller which handles USB enumeration and exchanges MIDI data packets. It will be available from Silicon Chip pr...

Google Schematic Heaven. It comes under Webpix or a similar name. Look under Dumble and find 60s dumble. there are 3 sheets. Pre amp, power amp and power supply. This is suposed to be the small 100 cct Goto www.roblivsey.com/dumble Towards the bottom there are some pictures of a small 100. you can g...

I think you may find Weber sells a 4 button box. Just the box. I have no idea what the quality is like but it may be worth a look. Alternativly get a local sheet metal worker to duplicate one for you.

Alan

Put a 270 ohm 5 watt resistor across the output of the output transformer. Highest impeadance to ground. 270 ohms in parallel will have negligible on the speaker and protects transformer when there is no load(either switching or forgeting to plug speaker in before turning amp on: not that any one of...

Have a look at the example you cited(Dumbleator). There are two stages:- the top one has 200 and somthing volts the bottom one has 300 and somthing volts. Each of these stages are biased on so that the input signal causes a variation of voltage on the grid. So each stage has a quiescent current. Let...

try http://music-electronics-forum.com/t2746

or just google "marshall 1960 4x12 cabinet plans"

Alan

Stop complaining. Queensland is having seious problems with floods from Rockhampton to Brisbane. NSW is also having floods. According to reports last week the area covered with water is supposed to be bigger than France and Germany put together. After the drought broad acre farmers had the best crop...

Way back when i first found this wonderfull site I downloaded a cct diagram IZ4 rev2.4 4/2/08. I have just done a search for IZ4 with a zero result. If you look at Rob Livesey site www.roblivesey.com/dumble the 124 gut shots :- row 7 , col 1 you will see the FET jack. A great big square thing with m...

From memory when I was looking at fonts the gilies was about $75 whereas the airstream was Free. About the only difference I could see was the Capital B. to see the difference look at a real Dumble and compare with the Vasinguitaramp version. www.vasinguitaramp.tripod.com/id4.html Pehaps some one wh...

Before commiting yourself to a particular speaker you need to ask yourself two questions. Why are Marshall 50 watt valve heads usually sold with a quad box and 100 watt ones with two quad boxes. What sort of speakers do Marshall put in those quad boxes. If you are playing a relatively clean amp eg F...

Just as an aside the Very First JTM45 was a Fender 410 Bassman. Same valves,same components in a chassis turned up sidedown which put the inputs at the wrong end. Like al large amp makers Marshall is cost driven. 6l6 output tubes were imported in England so Marshall switched to a locally produced Mu...

If you look closely, at enough Fender ccts, you start to see the simularity in different models in the same era. eg look at the Bandmaster,the Pro and the Super. As an other example look at Circuit AB763 ( Black Face era), You will find it in models rangeing from Delux Reverbs all the way up to Twin...

Gentlemen

According to "The Concise Oxford Dictionary of Quotations"

The quote should read "Religion...is the opium for the people" and it came
from "Critique of Hegel's Philosophy of Right"

I have not read Das Kaital so I conceed that there may be a similar
quote contained therein.

Alan