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Author Topic: Linear with four 572Bs  (Read 1864 times)
VE7ALQ
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Posts: 349




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« on: November 22, 2004, 03:21:09 PM »

Hi.  I have an opportunity to buy a linear with four 572B tubes.  I am somewhat perturbed by the fact there are 2700 volts on the plates (when SSB is selected)  I thought that the 572B was rated at 2500 volts max.  My Yaesu FL-2100B has 2400 volts on the plates of the 572B.  Fortunately I am only interested in CW work, and this linear has 1600 volts on the plates of the 572Bs for CW.

I am interested in buying another linear because my Yaesu FL-2100B does not cover the WARC bands or 160 meters.  (Here in Canada you may run one kilowatt on 30 meters CW) I also think with a plate dissipation of 150 watts per tube, my twin 572B Yaesu FL-2100B is kind of pushing the 572B tube ratings to run one kilowatt input on CW.
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W5HTW
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« Reply #1 on: November 26, 2004, 11:38:57 AM »

I have an old Hunter Bandit that has (4) 572B's in it and runs 2800 volts on the plates in high power.  In medium power it runs 2100 vdc and in low power 1800 vdc.  No harm appears to be done to the 572s at all, after years of use, though I rarely use it now.  I have never used it on CW, except for brief tests, and have found no problem there, either.  For maximum key-down CW/tune power, it will be about 2400 vdc, though, with 800 ma, so the voltage drop is rather pronounced under full load.  

I wouldn't worry too much about the 2700 volts.

Ed
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VE7ALQ
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« Reply #2 on: November 26, 2004, 12:22:04 PM »

I won the amplifier, a Clipperton-L on Ebay Auction.  I was told that it has 2700 volts on the four 572B tubes when set for SSB mode, and 1800 volts when set for CW.  Don't know what the voltage drop under load will be.

This linear supports 160 meters, and I am told, does not have fixed tuned circuits on the grid (exciter) side.  This means I should be able to work WARC bands as well.  (In Canada we can run a kilowatt DC input on WARC)
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