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Author Topic: TL-922 is 720W on CW mode, 1100W on SSB mode  (Read 5924 times)
HA5BZR
Member

Posts: 70




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« on: February 17, 2009, 04:25:03 PM »

Dear Friend!

I measured on SSB mode:
without drive: High Voltage is 3,1KV(it is ok) but Ip:only 0,14A (not
0,2A ,In the Manual the correct value is: 200ma )
with 80W drive:Ig:200ma, HV is drop to 2500V ,Ip:0,65A Power out:only
1100W

on CW mode:
without drive: High Voltage is 2KV(it is ok) but Ip:only 0,06A (not
0,1A ,In the Manual the correct value is :100ma)
with 80W drive:Ig:200ma, HV:I didnt measure ,Ip:0,6A Power out:only
720W

My question:
1.Is this power normal or low?My friend ' tl-922 linear is 1500W in SSB and
1000W in CW
2.If I set Ip to 200ma in SSB and 100ma in CW ,will be better Power out?


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AD4U
Member

Posts: 2543




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« Reply #1 on: February 18, 2009, 05:50:54 AM »

I had a TL-922 years ago and the power output you are getting is about normal.  This amp was designed when the power limit to US hams was 1KW DC INPUT.  It was never meant to be a 1500 watt OUTPUT amp.  I doubt if it will provide a clean signal if you over drive it to 1500 watts output.  A pair of 3-500 tubes CAN provide 1500 watts out, but not in this amp.

However some may differ with my opinion.

Dick  AD4U
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VR2AX
Member

Posts: 1015




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« Reply #2 on: February 18, 2009, 06:22:45 AM »

It is ok. You have 65-70% efficiency. Not much can be wrong with the tubes.

If the Ip "no-drive" bothers you, drop one tube at a time into them amp and measure the Ip of each one.

Also, check if one tube flushes more red than the other under use. Even if it does, that only means the tubes are not matched.

More drive = more output, but keep Ig below 150mA each tube absolute max.
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K6AER
Member

Posts: 5743




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« Reply #3 on: February 18, 2009, 03:33:47 PM »

Your friend has a very generous watt meter. 700-800 watts out on a stiff AC 240 Volt supply is about right. SSB peak power is about 1100-1200 watts. This is on an amplifier designed for 220 volts input running on our 240 VAC supplied to the home today.

Depending on your supply voltage you might want to check the filaments to make sure they are 5 volts AC at the tube socket. With 5% increase in filament voltage can shorten the tube filament life by 40%. If the voltage is too high you will need in insert some series resistance to lower the tube voltage.  About .02 ohms should do the trick.
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WB2WIK
Member

Posts: 21837




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« Reply #4 on: February 18, 2009, 07:00:14 PM »

I agree.  I've had a TL-922 and also a TL-922A and neither one could produce 1500W output power.

The plate voltage isn't high enough to do that.

The only amps that produce 1500W output power from a pair of 3-500Zs are some Henry models (4000V on the plates) and the Ameritron AL-82.  The earlier amplifiers that only run 3000V or so can't do it.

WB2WIK/6
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N6VOC
Member

Posts: 9




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« Reply #5 on: February 23, 2009, 08:40:09 AM »

I'm getting the same power output as you
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