[Amps] Old SB1000

[Ken Florence]

Hi Jim,
You'll probably say I don't need it. It's just an Icom 756 pro 3. With the 
new tube I am getting a KW at about 75watts drive. Going up to 100 watts 
there is no additional output. I'd probably prefer to just drive the amp to 
800 watts or so. ALC made that pretty easy before. I realize I could do 
that manually.


> Date: Tue, 15 Dec 2020 13:32:27 -0600
> From: Jim <jimw7ry at gmail.com>
> To: amps at contesting.com
> Subject: Re: [Amps] Old SB1000 built by me in 1988
> Message-ID: <19b45981-c1bb-16e2-3ee6-229c9d26f7b7 at gmail.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> What type of an exciter are you using with this amplifier that you need ALC?
>
> Thanks
> 73
> Jim W7RY
>
> On 12/13/2020 12:53 PM, Ken Florence wrote:
>> Hi all,
>> After a long time of having an intermittent no power out problems on
>> my amp, I finally figured out the problem was the parasitic
>> suppression circuit. I had put one of Rick Measures (SK-RIP) Nichrome
>> kits in it. Not sure if there was a solder joint issue or what, but
>> went back to the stock suppressor, replaced plate choke (original with
>> resonance issue on 17 meters) and it works fine. At least 40 through
>> 10. I notice when I tune it up on 80 meters I get a quick sizzling
>> sound sometimes (very short duration). I assume that is an arc? I need
>> to get the ALC line back on cause it's obvious it only needs about 75
>> watts input for full output. New Graphite tube. Have not tried 160 yet.
>>
>> So could it be a little over driving it on 80 that is causing that, or
>> if not, how do I narrow down where it is? Definitely nothing burnt
>> cause I went over it with a fine tooth comb.
>> _____________________________________________