How to test 572b tubes

572B linear amplifier testing

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how to test 572b tubes

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Monday through Friday. Learn More. We're confident our prices are the lowest. You can return any new or unused item within 10 days of the date your item was shipped and we will refund the full purchase price. DX Engineering B Power Tubes are the best choice for use in all types of RF power amplifiers and in all installation attitudes; including horizontal, diagonal and vertical.

Popular in many brands of Amateur Radio linear amplifiers, these B tubes are a modern-manufacturing version of the vacuum tube that has been around for a long time. Old tube making processes created wide variations in production, so testing and matching of tubes into sets was required. Now, each DX Engineering B tube is precision manufactured to a high standard and matched sets are no longer needed.

The B tube has been a proven performer in Amateur, commercial, and military service. These high-quality tubes will serve as direct replacements in any B RF amplifier or modulator and are ideal for upgrades.

Note: For additional product information, please look at the files under the "Documentation" tab. Put the full-power punch into your amplifier with brand new, modern, DX Engineering B tubes that make matched sets a thing of the past.

For building, repairing or upgrading, order the number of tubes you need with confidenceā€¦ DX Engineering B Power Tubes are here! DX Engineering Verified Purchase. Was this review helpful? Yes No.

If you feel that this review is inappropriate and should be removed from the site, report it to us by clicking the "Report Abuse" button below. Date: April 04, Date: July 30, Date: March 31, Date: October 28, Date: June 13, We do not sell email addresses or other private information.Upton With the ever increasing scarcity of old tubes, it is becoming more important that we try to save as many as possible.

Over the past two years I have been experimenting with the rejuvenation of these older tubes. The failures have primarily been due to filaments being burned out during application of the excessive voltages required. The tubes which failed either had filaments that had been weakened from long hours of operation, or were marginal at the weld joints.

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None of these failures were opened for investigation as they are still valuable for display purposes. The primary failure mode of these older tube types is a loss of electron emission from the filament or cathode. With the wide inter electrode spacing used in these tubes, a short is very rare except in the case of a broken filament wire where the oxide has flaked from the filament or cathode and has touched the grid. The loss of electron emission typically shows up in the tube tester as a weak tube or one which will not raise the meter needle.

If a tube tests normal and does not show any erratic indication on the test meter, no attempt should be made to improve it by rejuvenation. The equipment required for rejuvenation is relatively simple. In addition to a tube tester, a variable filament supply is required with a meter of reasonable accuracy for measuring the applied voltage.

In place of a separate filament supply, a filament voltmeter may be connected to the tube tester and the filament voltage switch and "line" adjustment used for voltage control. For the thoriated tungsten filaments it is preferable that no grid or plate voltages be applied during rejuvenation.

Insegnamenti a.a. 2018-

With the oxide emitter tube, voltages should be applied during rejuvenation. The removal of plate and grid voltages can be readily accomplished by the construction of an adapter socket with filament connections only. The voltage applied to the filament during rejuvenation mush be carefully controlled to the values given. The accompanying graph shows the results of various voltages applied to a thoriated tungsten filament during rejuvenation.

It shows that a voltage lower than the recommended value will eventually result in a fairly good tube, while too high a voltage will result in a tube which will remain weak. Emission loss is generally due to contamination poisoning of the emitting surface.

The vacuum and the original outgassing of the elements in these older tubes was not near the present day standard, therefore, they contain considerable residual gases. Vacuum tubes have essentially three basic types of emitters. These are: pure tungsten, thoriated tungsten, or a directly or indirectly heated oxide.

The type of emitter in a given tube can be determined by its operating color at rated filament voltage. The pure tungsten filament operated bright white, the thorated tungsten filament runs orange to yellow, while the oxide emitter operates in the dull red region.Users browsing this forum: Majestic [Bot]TechyMechy and 10 guests. Question on B. Posted: Jan Thu 16, am. Hello, I have a question about some B's. They came from a Ham Operator Estate.

I am lacking knowledge on these. I cant test them with my Hickok A that I know of. I do notice that some of the tubes have tags on them denoting wattage? For example WW and W. Can you tell me what he was referencing? Hi B tubes are made for transmitting.

Most transmitting tubes require filament current well in excess of what can be furnished by a receiving tube tester. These tubes were used in hi power linear RF amplifiers and if they are still good, would be valued by ham operators. Perhaps the tags refer to whatever amplifier he tried them in. But realistically, only he knows what they mean. Greetings to crabby1 and the Forum: The B is a power triode intended for linear amplifier service in the HF bands. The labels that you see on them are probably indicative of condition; they would be derived by measuring the RF output power of a linear amplifier probably while running only one tube and noting how much power was available when the amplifier was driven with suitable driving power for one tube.

They are normally run grounded grid and are wired in parallel. Therefore, to make the power measurements you show, one tube would be removed from a two-tube amplifier and the driving power halved. The watt tube is probably all right; the watt tube is getting tired and the watt tube is approaching the end of its useful life.

Nevertheless, all of them probably have some value. Brand names are important; if you can tell the manufacturer, it will make a difference in how much you can expect to get for them.April 13,PM Welcome, Guest.

Please login or register. Member Offline Posts: RF Parts B. Well I received my two B's from RF parts today.

811A Tubes

Physically they looked good. I tried both of them in my test jig. The first one the filament did not appear equally bright along its length. I left it cook for awhile and tried putting current through it. The test setup is to tie the grid and plate together and apply a regulated supply positive to the plate and negative to the filament transformer center tap.

how to test 572b tubes

While measuring the applied voltage and current you raise the voltage so it draws ma. At that point the voltage on a good tube should be about volts. So back to the bad tube. It took 59 volts to achieve ma. I then checked the second tube. The filament looked good. The current test was right on - 45 volts for ma.

So here we go. A call to RF parts tomorrow. These tubes were marked with equal numbers indicating they were tested and matched. I wonder how the filament could get that way.

If they really checked them it obviously could not have been that way when they did. Any thoughts on how a filament could get this way and would this be something that could just happen or is it always a manufacturing defect?JavaScript seems to be disabled in your browser.

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811A tubes vs. 572B tubes

Base indexed and internal structure aligned and supported for both horizontal and vertical operation. These Heavy Duty replacements are for original A tubes. Just plug in and play. Included is a Limited 90 Day Warranty against manufacturing defects and workmanship. Limited 90 Day Warranty. Hours of Operation Monday - Friday - pst.

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{Collins} Re: 811A & 572B Tube Testing

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how to test 572b tubes

Connectors - Unidapt. Connectors - RF Coaxial. Dummy Loads. Ferrite Cores. Galaxy Radio Service Parts. Inrush Current Limiters. Integrated Circuits. Modules - RF Power.Amateur Radio Operator License Certificates. No Returns; defective tubes will be replaced free of charge for 60 days. Once purchased and received by Platinum Tubes, vacuum tubes undergo exacting quality control measures to further assure reliable, sonically acceptable performance.

Power output tubes are first mounted in test fixtures and burned in for 24 hours. This burn-in helps stabilize the internal operating parameters of the tubes before measurements begin. Each power tube is then tested and graded for technical characteristics specified by platinum tubes engineers.

Only after a tube successfully passes these exacting challenges is it labeled and put into stock to be sold. Tubes not meeting these criteria are rejected to the supplier or disposed of. Average tube life will depend on several parameters: product type, how the product is installed, loudspeaker efficiency, room size and acoustic damping, listening habits or average sound pressure levels, A.

Generally, preamplifier tubes last up to 5, hours, while power amplifier output tubes will last up to 3, hours. Near the end of their useful sonic life, aging vacuum tubes may degrade the sonic character of the product s they are used in. The sound may become somewhat dry and lifeless, with a noticeable decrease in harmonic richness or bloom. Bass response may be diminished, and musical dynamics may flatten out or compress. Toward the very end of their service life, tubes may become noisy, noticeable as a slight rushing sound or rustling noise.

It is far better to replace vacuum tubes prior to the end of their service life, before severe sonic degradation or outright failure occurs. Running vacuum tubes into failure may damage to other internal components and cause needless repair expense. Factors which can shorten tube life include inadequate ventilation, overdriving loudspeakers at continuously high volume levels, severely fluctuating A.

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Very fast delivery great company to do business with thanks great job. Platinum Tubes. Standard International Shipping.JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. Not finding what you are searching for. Try a partial part number. Add to Cart. Limited Quantity Available, Made in China.

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how to test 572b tubes

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Circuit Boards. Circuit Breakers. Coax Seal. Coax Wrap. Cable Assemblies. Connectors - Binding Post. Connectors - High Voltage.

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Connectors - Jones Style. Connectors - Unidapt. Connectors - RF Coaxial. Dummy Loads. Ferrite Cores. Galaxy Radio Service Parts. Inrush Current Limiters. Integrated Circuits.


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