Amperex PL6574

Hello,  I have 4 NOS Amperex PL6574, made in Great Britian, tubes.  I cannot find any info on these.  Does anyone know what they were used for, and how much they are worth?  I want to sell them. 

  Regards:  Joseph

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check this link for some pertinent info.

http://frank.yueksel.org/tubes/sheets/030/p/PL6574.pdf

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Hi Dennis, Thanks for the link.  I have already seen that, and to be honest I have no idea what it means.  I understand what it represents, but my background in tubes is limited

Regards:  Joseph

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Here's an explanation of some applications of the PL6574 .........as far as the value goes I really have no idea...............sorry

Small thyratrons were manufactured in the past for controlling electromechanical relays and for industrial applications such as motor and arc-welding controllers. Large thyratrons are still manufactured, and are capable of operation up to tens of kiloamperes (kA) and tens of kilovolts (kV).

Modern applications include pulse drivers for pulsed radar equipment, high-energy gas lasers, radiotherapy devices, and in Tesla coils and similar devices. Thyratrons are also used in high-power UHF television transmitters, to protect inductive output tubes from internal shorts, by grounding the incoming high-voltage supply during the time it takes for a circuit breaker to open and reactive components to drain their stored charges. This is commonly called a "crowbar" circuit.

Thyratrons have been replaced in most low and medium-power applications by corresponding semiconductor devices known as Thyristors (sometimes called Silicon Controlled Rectifiers, or SCRs) and Triacs. However, switching service requiring voltages above 20 kV and involving very short risetimes remains within the domain of the thyratron. Variations of the thyratron idea are the krytron, the sprytron, the ignitron, and the triggered spark gap, all still used today in special applications.

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   Dennis , thanks for the info.  Now that I know what they are used for , I might put them on Ebay  and sell them.  Or I just might list them here in the Market and see if I get any bites. 

Regards ;  Joseph

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