One of my favorite JTM45’s because the block ends provided a stronger version of the chassis. This particular series was frequently found to have slightly higher internal high voltage, this created a little more power and dynamic range.

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Super rare first addition series JTM45. Excellent ++ condition. Fully serviced and in perfect working order. Power transformer meticulously re-wound by Mercury Magnetics. Original parts used.  This amp is part of the David Kronemyer collection.  Read the rest of this entry »

Click photo to see larger picture. Rare opportunity. 1964 JTM45

This is a very rare 1964 JTM45 first series, all original. Investment grade, collectors quality. This amp comes from the David Kronemyer collection, former Senior Vice President of Capital Records. It was in the studio for over 20 years and hadn’t been turned on in the past 10 years.  It is the last of the Kronemyer collection being released.  Read the rest of this entry »

Visit OBEDIA and watch some free tutorial videos, as well as free how to instructions on the OBEDIA blog. OBEDIA provides Technical Assistance for those who are stuck working in a DAW and 3rd party plugins.

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By: Kurt Prange (BSEE) of  Amplified Parts in Tempe, AZ(amplifiedparts.com).

The power rating of a guitar speaker is an indication of how much power it can handle without being damaged thermally or mechanically. It is not an indication of how loud the speaker will sound in comparison to other speakers. Let’s examine the basics of how speakers work, how the power rating is determined and look at things from the perspective of the guitar amplifier so that we can choose guitar speakers that will last a lifetime.

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Written by Kurt Prange

Kurt Prange (BSEE) is the Sales Engineer for Amplified Parts in Tempe, AZ (amplifiedparts.com). Kurt began playing guitar at the age of nine in Kalamazoo, MI. He is a guitar DIY’er and tube amp designer who enjoys helping other musicians along in the endless pursuit of tone.

The Reverberation Effect

A listener standing some distance from a sound source will perceive sound that is actually a combination of direct sound and indirect sound that has been reflected from the boundaries of the listening area. The reflections are referred to as reverberation. Reverb can enhance the perceived sound from a source by adding depth, color and liveliness.

Reverb can be thought of as being composed of two parts:
1) Early reflections - shape the listener’s conception of room size
2) Cluttered reflections - convey the liveliness of a room

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New Old Stock Supplies being tested for use in Mojave™ Ampworks LLC amplifier products.

Chances are, if you’re reading this article, you know what a Vacuum Tube is. The Vacuum Tube, most often referred to by guitar players, Hi-Fi buffs or recording engineers as just “Tubes” or the European definition, “Valves”, vacuum tubes have been a dominate device in the audio world. Sometimes an antiquated technology such as vacuum tube technology, can be a bit more expensive when compared to cheaper alternative electronic products such as transistors or ICs but even though there are some small learning curves to be had or a few pounds more to cary, all is forgiven in trade for the results that are yielded when sound is involved. Nothing makes sound like a good quality Thermonic audio device we all know as the vacuum tube. Read the rest of this entry »

The New Old Stock G.E.C. test results prove this is an excellent tube

First, you need to know what the Amplitrex is. The Amplitrex AT-1000 is the state of the art computerized tube tester and one of the only tube testers produced that is able to work independently and has custom interfaced software for PC operation. The Amplitrex AT-1000 is a current production tube tester and unlike tube testers built 35 to 55 years ago, the Amplitrex offers laboratory grade testing under microprocessor control and makes it possible to check a tube according to the original manufactures design specifications. Even more valuable is the ability to duplicate not just our guitar amplifiers circuit parameters but any guitar amp parameters. Read the rest of this entry »

With technology progressing at the speed of light and computers now in most everyone’s hands, home recording studios are popping up everywhere. Whether you are a professional artist or a home recording enthusiast the two most important parts of your recording system are your microphones and your monitors. A vintage enthusiast should consider the same variety of speaker and microphone that set the standards for the era for which they have become so famous.

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