#Bias amp 2 amp list serial numbers
#Bias amp 2 amp list serial
#Bias amp 2 amp list software

An adjustable bias supply provides a small negative voltage to the control grid of the output tube. In a fixed bias output circuit, the cathodes of the output tubes are connected directly to ground. Bias is self-regulated by the relationship of the gain and frequency of the input signal with the cathode and screen resistors. Cathode biased amps do not have an adjustable bias supply. Screen resistors connect the screen grids of the output tubes to the B+В power supply. The cathodes of the output tubes of a cathode bias output circuit connect to ground through a cathode resistor and most often also through a bypass capacitor. While the earliest AC-100 amps had a cathode or 'self biasing' output circuit, the AC-100 MkII had a fixed bias output circuit.

If too little current flows through the tube, the tone from the amp will be bland and lifeless. If too much current flows through a tube, the tube may run red hot and fail prematurely. This served to further electronically shield the preamp from the power supply.Д«ias is the amount of current that flows through a tube. Aluminum is even less likely than steel to pick up hum and oscillations (eddy currents) from the power supply and output amp section of the amp. The vertical aluminum section of the chassis enclosed the preamp circuitry and secured the control panel. This improved air circulation inside the cabinet and provided additional clearance between the cabinet and the tops of the power tubes. The sockets for the Eе…ѓ4 power tubes were suspended in a tray below the top of the steel base. Unlike red and gray AC-100 control panels, the nomenclature on black AC-100 control panels included lines pointing to the input jacks and the pilot lamp (see picture below). Contrary to views expressed by others, there is no reason to suspect or evidence to suggest that the black control panel on #1858 is not the original installed by JMI. He also recalled that some artists preferred the black control panels so some were kept in stock for use on special order amps. He indicated that JMIВ retained a stock of black panels for short-term use to keep the flow of merchandise heading to the dealers. He told me that JMIВ would temporarily switch to black control panels if they ran out of stock of the more commonly used red or gray control panels. I asked Denney about the occasional use of black control panels on AC-100 amps. One day I had a long phone conversation with Dick Denney about the JMIВ days. Former JMIВ lead engineer Dick Denney built these Colorsound pedals at his home in Kent. North Coast Music acted as the USВ distributor of Colorsound pedals in the late 1990s.

#Bias amp 2 amp list serial

However, black control panels also surfaced occasionally on later AC-100 amps, such as serial #1948 shown on this page.

#Bias amp 2 amp list serial numbers

It was reported in 'Vox Amps - The JMIВ Years' by Jim Elyea that AC-100 amps with black control panels appeared between serial numbers #227 and #336.

Thick edged head cabinet with black diamond grill, one pin corners, Vox logo handle and small one piece Vox logo.

'VSP'В rotary style mains voltage selector.

Two dual element main filter capacitors.

Zener regulated fixed bias output stage, no negative feedback.

IвЂ™ve also added an intensive in-depth review made by David WallimannВ that he has justВ uploaded to his YouTube channel, so be sure to check that one out as well.

#Bias amp 2 amp list software

If you havenвЂ™t seen BIAS Amp 2 before then head on over to my article herewhich covers all the basics on this virtual amp software package. Check out the demo video below for features and also an overview of the app running on iOS. All of which means that you can use all the stuff that has already been modelled by users around theВ world, including some celebrity endorsed amp setups/patches and this all makes for a handy, mobile virtual amp setup.Д¬urrently, it is only available on AppleвЂ™s iOS platform and so youвЂ™ll need an iPhone or iPad to run the software. I like that it integrates into their existing hardware line-up and works with their Tone Cloud services, too.

The idea here is to offer something you can tailor to suit your needs. Another neat feature is the ability to addВ Celestion speaker IRs вЂ“ again via in-app purchases.

The new features in BIAS AMP 2 Mobile also integrate with their that BIAS Head, Rack and MINI products and existing users can buy the app at a discounted price.Д®ssentially, this gives you control over various amp models (you can also add more amp packs via in-app purchases) including their tubes, transformers, tone stacks and even multi-mic your virtual speaker cabinets. BIAS AMP 2 Mobile is Positive GridвЂ™s new standalone mobile guitar amp and processor app for iOS.