I do know that when I listen to music I want to be excited by what I hear. All these tubes are pentodes or beam power amplifier tubes. The approach to test was simple. The other point of interest concerning dissipation is that at no time did any of the configurations have a screen dissipation in excess of 2w. Although historically widely used in all manner of electronic goods, many of which are still in service, it is in guitar amplifiers where its use has become archetypal. The pi filter is a capacitor in parallel between the rectified AC signal and ground, followed by a choke or resistor in series with the signal, and then another capacitor between signal and ground. In addition, a comprehensive set of data concerning biasing the 6V6 in UL mode simply does not exist.

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Vacuum tubes offer simple circuit topologies, straightforward construction techniques without the need for heatsinks and printed circuit boards, and great sound.

The other important thing to note is that the optimized bias voltages are somewhat greater than those generally published for pentode operation. No, create an account now. Keep in mind that any resistance will cause a voltage drop when current flows through it.

However, the majority of this information is focused on push-pull configurations and finding the “optimum” point for the UL taps on the output transformer. Bias 1 volts- 60ma. For this reason, valves that have a low Rp can yield more power in class A1 than other valves with similar Pa ratings.

I think the layout would have been cleaner if I had put the rectifier where the filter cap is and vice-versa, but I wanted the tubes to be symmetric for aesthetic reasons. We listened to console after console and finally settled on a Philco console record player. I’d rather grate my shins with a salted hoof rasp. The 6V6 is a beam-power tetrode vacuum tube. I welcome corrections, elaborations, suggestions, and whatever you feel like sending.


This means you can use your salvaged preamp transformer to build the power supply and not worry about burning it up.

Building the Poindexter 6V6 Amplifier

Connect the screens to the plates via these resistors for triode operation. Never miss a story from boozhoundlabswhen you sign up for Medium. Corey Sent from my iPhone using Tapatalk.

Pin 6 is connected to pin 3 with a new wire. Hi soundguruman, and thanks for your reply. We are operating the tube in what is called class A, which means that the grid of the tube is always negative and there is always current flowing through the tube.

Every tube has a maximum plate dissipation in Watts. Here is a picture of the whole test setup on my bench. Instead of completely rebuilding the engine and boring all 6 cylinders, Marty just bored out the one bad cylinder, installed 1 larger piston and bolted that sucker back up.

Increased fidelity can be had by decoupling the left and right channels, ultimately by building monoblocks. Our sound guy sometimes puts obsticles in front of my amp to tame the stage sound.

Don’t aim the speakers at anyone. It would appear that this operating point is tfiode the tube a little bit too hot, but for reasons we will discuss when we talk about the cathode resistor, the actual plate dissipation is just rtiode 12W. The tube is driven by a 4S preamplifier using a 12AU7which is driven by my signal generator. Probably won’t get to do too much more for a few days.


6V6 in triode mode – big hum and blue glow

A good example of this is the data available for power amplifier tubes. If using four 6V6 tubes, double the current capacity of the high voltage volt winding. This is the “Chassis or Earth” ground. We might be dropping a little more voltage across the choke, and the Hammond transformers we will be using are typically underrated so all we can hope for is that we will be in the ballpark of the correct voltage, which will just have to be good enough.

6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization

Or else, why doesn’t more amps doing that? Ground the IEC directly to it’s own point on the chassis, do not use the filament center-tap cut it off and shrink-wrap the end then tie a cement Ohm 5 watt resistor to each leg of the filament and land them on the same ground point as the IEC ground.

After performing this investigation, I now have a complete set of data on how to bias and operate the 6V6 in the SU UL configuration at least at one load resistance for my future builds.