Sound Garage Tales

I couldn’t control myself. After seeing these cool demos of the Magick Eye tube, (a tube commonly used as a tuning indicator in old radios) I had to try them out in my amps. So I plopped together a quick video to see the dramatic and cool visual effect. I will probably tweak some values but overall I am very happy with the visual effect.

The circuit is nothing complicated. All you need is one of the many Magick Eye tubes existent out there, with many different beam patterns, that might need a slightly different pin-out connection, but all of them work in a main common way – it taps in the path of the signal level of roughly 10 to 25 Volts (depends on the type of tube used), and a high DC voltage of something between 200 to 250 (B+).

I used a Russian EM80/6BR5 I scored off Ebay. The EM80 tube has a “U” shaped fluorescent target and two rods connected to the anode, producing two angled shadows on the edge triggered by the control voltage (input signal).

The schematic I used is the one below, posted by Michael on the 18watt site.

I tapped the control voltage (signal) off one of the plates of the EL 84 tubes, and got the high voltage of about 250v off one of the filter caps.

Check this video out of how cool this can be!

A dramatic amp mod as well as the simplest in the Epiphone Valve Junior Head Tube Guitar Amplifier is known as the “JP1 Mod”. The name derived from the jumper labeled JP1 on the board.
It basically morphs the tone of the guitar amp from one with no definition, dark, to an instant edgy and more present tone. To my ears things came to life using the Fender Telecaster compared to the raw un-modded amp I had.

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The patient is in the house. Before taking the scalpel and start the surgery, I thought of shooting a quick reference video for the newly receive out of the box Epiphone Valve Junior head. We will use this to compare the tone for each mod as we go along in our face lift journey.

I was particularly stunned on how dark this guitar amp sounds! In the video I have a Fender Telecaster (Mexican) that sounds crystal clear through my Gabriel V18 or V33 guitar amps. Bright, beautiful upper mids, etc. The overdrive was nevertheless EL-84-ish but without any definition or character or identity. i guess that’s what should be expected from a $150.00 (shipped) head, right?

The speaker cabinet has an AlNiCo Blue Celestion speaker , and has an open back. But even with this speaker the amp is simply too dark.

But the amp has potential. And we’ll discover that as we will start modding it. Stay tuned!

Welcome to our first video on modding the Epiphone Valve Junior guitar amplifier. I ordered a head version from Musicians Friend specifically for this. It is a very exciting project to me and hopefully will make your life easier modding it by watching these video tutorials.

I don’t know how many times it happened that I spent so much time on trying to guess how to open a unit just to be able to get to the heart of the problem and fix it. Yes, even pulling the chassis out of an Epiphone Valve Junior can be intimidating for the first comer.

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With the price hike in boutique guitar tube amps, (and rightly so since, depending on the components quality that go into the construction the initial costs can add up very quickly), there seems to be a tone-void gap between solid-state easily accessible (cheap) and the high end tube amps out there.

So, what will you do, if you are a serious guitar player but have no cash to spend on one (two or three) of the big name tube guitar amp?

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