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Author Topic: TL-922 Tuning Question  (Read 873 times)
W0XX
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Posts: 1438




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« on: December 04, 2017, 03:55:10 PM »

Found out this amp had a bad tube and seems to be putting out around 700 or so watts in CW position within the grid and plate current readings.  I tune basically for max output and then check grid and plate to insure within the manuals limits.

One question is this.  On 160 and 75 the plate control is around the middle of the 7 Mhz range instead of around the 3.5 mark.  Does this represent any concern or just depends on the antenna?  160 is the same.  Higher bands 7 mhz and up seem to be close to their markings on the Plate control.

Sorry for the questions, but just not familiar with this amp and / or how it plays.
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W1QJ
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« Reply #1 on: December 05, 2017, 03:05:27 AM »

All that is perfectly normal.
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W0XX
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« Reply #2 on: December 05, 2017, 06:47:20 AM »

Good to know.  Not familiar with this beast
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KM1H
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« Reply #3 on: December 05, 2017, 11:23:04 AM »

Are you familiar at all with amps?

The TL-922 tunes like thousands of others such as the SB-220 family which prouduced over 10 THOUSAND and was the basis for the 922.
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W0XX
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« Reply #4 on: December 05, 2017, 04:53:13 PM »

Yes, I have used the SB-220, SB-1000, ACOM 1000...just never used this TL-922A (nor have I ever seen a DTR-2000L), ...why?
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KM1H
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« Reply #5 on: December 05, 2017, 05:48:15 PM »

Very few are familiar with the majority of amps but those with an old style Extra should understand the basic concepts that all follow. I got mine in 68.
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W0XX
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« Reply #6 on: December 05, 2017, 06:03:40 PM »

Congrats!
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WA4JQS
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« Reply #7 on: December 05, 2017, 09:38:10 PM »

THE TL 922A should be tuned like the sb 220 series dip the plate . mine i tune with the load at 0 and plate in mid range of the band i am on, i apply 20 watts drive and dip the plate current then increase the drive to about 40 watts and start increasing the load control until the current reading goes up. then i dip the plate again. i keep increasing the load till i get a plate dip at around 400 ma's on the meter with the switch in the plate current position . you may find when you are finished that the plate knob might be out of the range for the band you are on by a small bit but not a lot. the problem you are talking about might be because you are tuning for max output and not a dip in plate current. with a well tuned amp you should find that min plate current will occur at max power out. but this is not always the case if the amps tubes are not nuterlized. But i have only been around since  1962 with i got my general at 15 and now at  71 they tell me the theory i learned has changed hi hi... 73 Tony WA4JQS
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W0XX
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« Reply #8 on: December 05, 2017, 11:47:22 PM »

My only reason for asking initially is I had issues with this one from a dealer, and found that a tube had been damaged in shipment (open) which caused some issues.  Using an alternate tube, proved the amp to be okay...

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K6AER
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Posts: 4688




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« Reply #9 on: December 08, 2017, 06:20:06 PM »

What is the impedance of the load? That will effect the tuning and load  registration.
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