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Author Topic: Which line voltage versions of TL-922?  (Read 880 times)
HA5BZR
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Posts: 68




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« on: February 03, 2009, 12:59:57 AM »

Dear Friend!

I like to buy a used TL-922.What is important to know before buying?
In my house is 220V line voltage.
Two version of TL-922? 240/120V  or  220/240V line voltage? Who know it sure?
For me is 220/240V version is needed setting inside/back the linear to 220V? At 240V position will it be lower power output than 220V position if I have only 220V?Anybody tried it? Much difference in P out?
240/120V version is not so good for 220V line voltage?

                                Thanks  Laszlo
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VR2AX
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Posts: 594




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« Reply #1 on: February 03, 2009, 04:19:43 AM »

K version = 120/240V (settable)
W version = 220/240V (also settable)

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W1QJ
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« Reply #2 on: February 03, 2009, 05:16:33 AM »

applying 220v to a 240 transformer is no problem.  The filament voltage and HV will be a little low, not enough to make a world of difference.  You will see a little less output, but not all that much less.  If you put 240 on a 220 line, the the filament voltage goes high and the tube life goes down.  If you have exactly 220v line, then either amp will work OK for you on 220v.  The difference is not that much.  
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VR2AX
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« Reply #3 on: February 04, 2009, 04:57:09 AM »

To add to what's been said, please refer to W6SAI's article in QST May 1991 (available below - 1MB PDF download!!)

http://www.rfparts.com/pdf_docs/3-500Z_CQ_Article.pdf
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KB1NXE
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Posts: 363




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« Reply #4 on: February 04, 2009, 07:38:50 AM »

Running it on 220V while strapped for 240 may also be preferable.  EIMAC (tube manufacturer) says a filament voltage reduction of 5% will double the lifetime of the 3-500Z tubes.
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