Tube Amp Archive

To be specific, non-isolated jacks and the grounding topology contribute to the sound of a D style amp. They also contribute to or hinder the amp's ability to reject rf and ground loops. I would say the question is: do I like what I've got (or have heard elesewhere), or do I think a change in the st...

It is better to remain silent and be thought a fool than to speak and remove all doubt.

Increasing power supply capacitance will decrease ripple current and increase energy storage/joules. This increases the amps ability to rapidly supply larger changes in output current (slew rate). This is similar to damping in that the amp has a firmer grip on the signal, and the amount of sag or sp...

Daniel, http://www.brownnote.net/ These are great amps, and you get the experience of building the whole thing (Ceriatone circuit boards are prebuilt). As I have said before, just the layout diagram from Brownnote is worth the price of the kit. Yes I know, it's free on line. Still, their attention t...

A true differential amp needs a current source. As a mixer 1 input is inverted, so the output = A-(-B) = A+B. The circuit gets complex when you consider all of the extra components, and this is probably why we don't see a lot of them. The attached is a first stab at a battery powered version. It was...

Thanks, Heisthl

Does anyone have a specific recommendation for a tremelo circuit?

Using optocouplers and self-latching relays is another way to approach switching topologies. Attached is a pdf of a paper I wrote in the January 2007 issue of audioXpress. It is online at: http://www.audioxpress.com/magsdirx/ax/addenda/index.htm then scroll down to 1/07; Low Level Analog Switching. ...

Connecting a voltmeter will draw current through the diodes and let them rectify, but heisthl is right: you need a capacitor to measure the peak voltage the supply normally charges up to. Without the cap the meter sees pulsating DC, and will measure somewhere between average (63.6% of peak) and rms ...