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Output transformers and push-pull stages. Part 2

tubes Posted on 23. January 2020 by tmi13. May 2020

This is a simplified approach, just to explain how it works. This part 2 is actually published before part 1. The principles and calculations are basically the same for a push pull stage as it is for an SE stage, … Continue reading →

Posted in technical | Tagged push-pull, transformer | 2 Replies

A little primer on – Valve Capacitances

tubes Posted on 3. June 2019 by tmi3. June 2019

We all must be aware of what a capacitor is; it can be considered as two metal objects with an insulator between. It is actually as simple as that. Therefore, there will always be capacitance between the elements of a … Continue reading →

Posted in technical | Tagged capacitances, tube capasitances | Leave a reply

How to test an output transformer.

tubes Posted on 26. March 2019 by tmi4. December 2019

It is relatively easy to determine whether a transformer is defective or not, by using a multimeter.  And if you are working with tube amps you may need to calculate the output transformer impedance especially when we have an old … Continue reading →

Posted in technical | Tagged transformer | Leave a reply

Grid Leak Bias or Contact Potential Bias.

tubes Posted on 7. February 2019 by tmi16. May 2019

There are several ways to make the correct bias for a valve. We have fixed bias, where the grid is supplied with a constant negative voltage, and automatic, or cathode bias where we bias the valve by giving the cathode … Continue reading →

Posted in technical | Leave a reply

Russian Equivalents for Western tubes

tubes Posted on 31. January 2019 by tmi31. January 2019

Today Russian tubes are frequently used by enthusiasts all over the world, but it is not always easy to find out what Russian tube that can be used as a replacement for a Western tube. Information from the sellers of … Continue reading →

Posted in TubeData | Tagged tube data | Leave a reply

Impedance matching of loudspeakers to output valves.

tubes Posted on 30. January 2019 by tmi5. February 2020

This is a simplified approach, just to explain how it works. A loudspeaker usually has an impedance of 4 – 8 ohms, and an output valve will usually demand a load of several k.ohms. To make this work we need … Continue reading →

Posted in technical | 2 Replies

Grid current, why does it occur?

tubes Posted on 30. January 2019 by tmi31. January 2019

Grid current are in most cases unwanted, but can in certain circuits be necessary to make the circuit function as wanted, that will be covered in a separate article later. Now I will  look at the causes for unwanted grid … Continue reading →

Posted in technical | Tagged gridcurrent | Leave a reply
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Recent Posts

  • Output transformers and push-pull stages. Part 2
  • A little primer on – Valve Capacitances
  • How to test an output transformer.
  • Grid Leak Bias or Contact Potential Bias.
  • Russian Equivalents for Western tubes

Recent Comments

  • tmi on Output transformers and push-pull stages. Part 2
  • Larry Weaver on Output transformers and push-pull stages. Part 2
  • tmi on Impedance matching of loudspeakers to output valves.
  • giovanni on Impedance matching of loudspeakers to output valves.

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