[Amps] THE SKINNY ON MY AL-82

[Don Allen]

Several HF transceivers have had overshoot problems, including other 
ICOMs.  Yes, the IC-7410 is repaired by ICOM for no charge.  However, 
this is the same policy with the TS-590S.  Kenwood's ALC Update Program 
is absolutely free-of-charge, including return shipping.  Later 
production runs of the TS-590S, as well as the new TS-590SG units do not 
have any ALC overshoot problems.   My TS-990S does not have any ALC 
overshoot, as well as my TS-590S which was updated by Kenwood East at no 
charge in June.

73
Don W9CW


On 12/18/2014 9:14 AM, Jim W7RY wrote:
> Is he (YOU) SURE it was parasitics?   More likely hot switching of the 
> amplifier T/R relay. This causes LOTS of problems that folks THINK are 
> parasites.
>
> After I install my QSK system into amplifiers, the arcing completely 
> STOPS because the relays are no longer hot switched.
>
> ALC overshoot spikes also cause arcing in amplifier capacitors. Mostly 
> Kenwood has ALC overshot including the TS-590S.
>
> Although, the Icom IC7410 has ALC overshoot problems on SSB. Which is 
> repaired by Icom for free. Although only the units made before mid 
> 2014 are affected.
>
> 73
> Jim W7RY
>
>
>
>
> -----Original Message----- From: Bill and Liz
> Sent: Thursday, December 18, 2014 6:49 AM
> To: amps at contesting.com
> Subject: [Amps] THE SKINNY ON MY AL-82
>
> I recently tracked down the ham who had done work on my AL-82 as well 
> as a second one purchased at the same time by another fellow who was 
> forced by health out of ham radio.  I learned that right from the get 
> go both amps had parasitic problems and hardly a day would go by 
> without one or the other having an “event” (hence the original owner 
> had two of them!).  These amps date from the 90s-perhaps they were of 
> the initial design before changes started being made.
>
> The Measures parasitic retro kits were installed in both amps and the 
> problems immediately disappeared.  Both amps today have the same minor 
> problem on 10M: extreme heating, discolouration and distortion of the 
> 100 ohm paralleled resistors in the suppressors but no parasitic events.
>
> From this information it would appear that I would not be wise to 
> re-install the original suppressors, and, since I seldom run the amp 
> over 400W on 10M anyhow, that I should “let sleeping dogs lie” as it 
> were.
>
> Thanks to all who came forward with ideas and advice.
>
> Bill VE3NH
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