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A bit about Single ended stages, and output transformers.

tubes Posted on 13. October 2022 by tmi22. October 2022

I recommend that the article impedance matching of loudspeakers to output valves is read first. It will give some useful basic knowledge about the subject. In this article I will give some more formulas and explanations about the subject, that … Continue reading →

Posted in technical | Leave a reply

Valve formulas part 1. Common Cathode

tubes Posted on 4. June 2022 by tmi5. September 2022

When we want to design a valve stage, we normally use the characteristic curves to obtain the data we need, and then use some formulas to calculate the needed values. All formulas for valves are based on based on the … Continue reading →

Posted in technical | Leave a reply

Output transformers and push-pull stages.

tubes Posted on 23. January 2020 by tmi30. August 2021

This is a simplified approach, just to explain how it works. The principles and calculations are basically the same for a push pull stage as it is for an SE stage, so everything described in the Impedance matching of loudspeakers … 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 tmi14. November 2022

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 | 1 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 | 2 Replies

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 | 3 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

  • A bit about Single ended stages, and output transformers.
  • Valve formulas part 1. Common Cathode
  • Output transformers and push-pull stages.
  • A little primer on – Valve Capacitances
  • How to test an output transformer.

Recent Comments

  • Sid on How to test an output transformer.
  • Output transformers and push-pull stages. – tubes on Impedance matching of loudspeakers to output valves.
  • tmi on Grid Leak Bias or Contact Potential Bias.
  • Jon on Grid Leak Bias or Contact Potential Bias.
  • tmi on Output transformers and push-pull stages.

Archives

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  • June 2022
  • January 2020
  • June 2019
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Recent Posts

  • A bit about Single ended stages, and output transformers.
  • Valve formulas part 1. Common Cathode
  • Output transformers and push-pull stages.
  • A little primer on – Valve Capacitances
  • How to test an output transformer.

Recent Comments

  • Sid on How to test an output transformer.
  • Output transformers and push-pull stages. – tubes on Impedance matching of loudspeakers to output valves.
  • tmi on Grid Leak Bias or Contact Potential Bias.
  • Jon on Grid Leak Bias or Contact Potential Bias.
  • tmi on Output transformers and push-pull stages.

Archives

  • October 2022
  • June 2022
  • January 2020
  • June 2019
  • March 2019
  • February 2019
  • January 2019

Categories

  • technical
  • TubeData

Meta

  • Log in
  • Entries feed
  • Comments feed
  • WordPress.org
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