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Yearly Archives: 2019

A little primer on – Valve Capacitances

tubes Posted on 3. June 2019 by Tor8. May 2023

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 | 2 Replies

How to test an output transformer.

tubes Posted on 26. March 2019 by Tor14. 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 Tor16. 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 | 6 Replies

Russian Equivalents for Western tubes

tubes Posted on 31. January 2019 by Tor31. 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 Tor5. 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 | 4 Replies

Grid current, why does it occur?

tubes Posted on 30. January 2019 by Tor23. March 2025

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 | 6 Replies
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Recent Posts

  • Difference between power valves and voltage amplifying valves
  • 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

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  • Tor on Grid current, why does it occur?
  • Universitas Telkom on Grid current, why does it occur?
  • Universitas Swasta Terbaik on Grid current, why does it occur?
  • url on A bit about Single ended stages, and output transformers.
  • Universitas Swasta Terbaik on Grid current, why does it occur?

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Recent Posts

  • Difference between power valves and voltage amplifying valves
  • 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

Recent Comments

  • Tor on Grid current, why does it occur?
  • Universitas Telkom on Grid current, why does it occur?
  • Universitas Swasta Terbaik on Grid current, why does it occur?
  • url on A bit about Single ended stages, and output transformers.
  • Universitas Swasta Terbaik on Grid current, why does it occur?

Archives

  • March 2023
  • October 2022
  • June 2022
  • January 2020
  • June 2019
  • March 2019
  • February 2019
  • January 2019

Categories

  • technical
  • TubeData

Meta

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  • Entries feed
  • Comments feed
  • WordPress.org
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