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Author Topic: One more Kenwood TL-922 question, inspection?  (Read 1406 times)
KD8Z
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Posts: 169




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« on: January 05, 2008, 10:39:35 AM »

One more per purchase inspection question about the Kenwood TL-922 amp.

This amp has been unused for about a full year, what should I do to inspect it for serviceability pre purchase?

thank you
73
kd8z
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KD8Z
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Posts: 169




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« Reply #1 on: January 05, 2008, 10:42:58 AM »

This amp has an unknown history, its not impossible it was cb owned in the past, no history on the amp.
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W3LK
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Posts: 5644




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« Reply #2 on: January 05, 2008, 12:31:45 PM »

If you are not buying it from a ham you are personally acquainted with, you are buying a pig in a poke.

I would never buy a used amp unless I could inspect it and put it on the air first.

73,

Lon - W3LK
Naugatuck, Connecticut
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KD8Z
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Posts: 169




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« Reply #3 on: January 05, 2008, 12:40:13 PM »

Its almost free, just the case is worth a few bucks!

73
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KD8Z
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Posts: 169




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« Reply #4 on: January 05, 2008, 12:46:12 PM »

Besides lon, I thought there may be someone that has owned a Kenwood TL-922 and would be familiar with its peculiar ways.
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W5RKL
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Posts: 891




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« Reply #5 on: January 05, 2008, 01:17:10 PM »

"Its almost free, just the case is worth a few bucks!"

Almost free doesn't always mean you will be able to get
it on the air for "almost free". The cost of the
3-500Z tubes alone can ruin the "almost free" deal
especially if it's possible the amp was owned and used
by a CBer on the 11 meter band.

Not worth the effort.

73's
Mike
W5RKL
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KD8Z
Member

Posts: 169




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« Reply #6 on: January 05, 2008, 05:54:14 PM »

I said it wasn't impossible that a cb'er could have owned it, I didn't say it was a fact, simply speculation.  But I see again that the typical situation arises, a few concentrate on what they want to focus on rather than answer what was asked.

Closed
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W3LK
Member

Posts: 5644




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« Reply #7 on: January 06, 2008, 10:59:36 AM »

KD8Z:

With all due respect, YOU brought up the CB angle and there was only ONE response that commented on it, and the comment was on the mark: if the amp has been used for CB, it is likely the 3-500 is bad and will need to be replaced. It's possible the power supply could have been damaged as well.

All you have received was good advice. That you, for some reason, don't like the advice is your problem.

73,

Lon - W3LK
Naugatuck, Connecticut
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K4DPK
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Posts: 1077


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« Reply #8 on: January 06, 2008, 01:01:34 PM »

I recall a problem with the filament transformer and supply to tube sockets.  Seems a few of them actually caught fire because of filament bypass caps shorting out.

Quick way to check for this is to see if tubes are normal brightness when turned on.  

I don't think there were any other consistent problems.

That's a pretty good 1300 watt amp.

73
Phil C. Sr.
k4dpk
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K4DPK
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« Reply #9 on: January 06, 2008, 01:06:57 PM »

Regarding the CB angle....

I don't think any circuit modifications would have been necessary to run the amp on 27 MHz, other than maybe a re-adjustment of the 10 m input coil.

Probably the best approach is to simply put it on the air and see what happens.

Worst case, it's probably worth a lot more in parts than you're paying for it.

73
Phil C. Sr.
k4dpk
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KD8Z
Member

Posts: 169




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« Reply #10 on: January 06, 2008, 06:22:59 PM »

Thanks to all that responded...

my last msg. sounded a little terse, it was not meant to be, I simply worded it poorly.
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W3LK
Member

Posts: 5644




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« Reply #11 on: January 07, 2008, 06:28:14 AM »

Good Luck with the project.

73,

Lon - W3LK
Naugatuck, Connecticut
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A smoking section in a restaurant makes as much sense as a peeing section in a swimming pool.
WA9SVD
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Posts: 2201




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« Reply #12 on: January 13, 2008, 06:41:42 PM »

 K4DPK on January 6, 2008       Mail this to a friend!
Regarding the CB angle....

I don't think any circuit modifications would have been necessary to run the amp on 27 MHz, other than maybe a re-adjustment of the 10 m input coil.

Probably the best approach is to simply put it on the air and see what happens.

Worst case, it's probably worth a lot more in parts than you're paying for it.

73
Phil C. Sr.
k4dpk
-------------------------


    Actually, the BEST way would be to test it on each band with a dummy load, rather than putting it on the air and possibly causing problems to others.  If it can't load and operate properly with a dummy load, it won't operate properly with a "real life" antenna.
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K6AER
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Posts: 3497




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« Reply #13 on: January 17, 2008, 07:47:01 PM »

The biggest problem with the TL-922 and 922A’s is the band switch. The 80 meter position get burned out when the inattentive ham loads up on twenty meters (having been on 80 meters that night) while the band switch is in the 80 meter position.

The rest of the amplifier is pretty straight forward. New tubes are about $300 a pair so even if the tubes are bad at almost free, TL-922 is a pretty good bargain. A new band switch is about $80 but it will take about 1.5 hours to install one. This job is not for the timmid. The diodes and capacitors are standard and you can recap the amplifier for about $45. The only critical item on the amplifier is if the transformer is shorted or open.  You can use a SB-220 transformer but the fit is tight. Broken meter movements are more problematic.
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