[Kenwood] TS850 and SB200

Wed Nov 19 09:07:51 EST 2008

Brian,

Mike is correct in what he says about the relay. I use a TS-950SDX in combination with an SB-200 here, and for many years, the 950's relay was able to handle the 200's relay without any apparent problem. But to be on the safe side, I purchased an Amp-Keyer interface (around 50ドル) a couple of years ago, and it gives me great peace of mind!!

However, my main concern in my original post, was the CORRECT tuning of the amp.
You didn't say in your original post whether you had any experience with tuning final tubes, be it for a tube radio or amplifier. I'm talking about the dipping and loading of the amp's plate voltage and grid current. Done incorrectly, i.e. too high a voltage/current, you've got cooked tubes. The tubes can actually melt! You've got a 2400 volt power supply in there!

If you want, I can dig up my Heath manual and e-mail a copy of the tuning procedure to you.

Take Care and GL

Darrell,
VA3DG/VE3DDG

Mike, K9MI  wrote.....

I'm not an amp person, but isn't the relay on the 850 12 volts dc, and the 
SB200 around 120 volts ac? There are plenty of places that make interfaces 
for such a combination. Check around, but I'm sure you do not connect an 850 
direct to an SB200/SB220, etc.
GL...
73 - Mike K9MI
--- On Tue, 11/18/08, Brian K. Gaskamp <ka5bkg at sbcglobal.net> wrote:
From: Brian K. Gaskamp <ka5bkg at sbcglobal.net>
Subject: Re: [Kenwood] TS850 and SB200
To: va3dg at rogers.com
Received: Tuesday, November 18, 2008, 11:49 PM
Darrell the amp did not come with a manual, maybe its on mods.dk?

I read somewhere tonight to run this with success is use a footswitch to key the amp and then transmit with the 850, less of a chance of burning anything up.

The article said its sort of the old fashioned way of operating but lot safer than risking the radio to be messed by by voltages?

What you think.

73,
Brian
----- Original Message ----- 
From: Darrell Drake 
To: kenwood at mailman.qth.net ; Brian K. Gaskamp 
Sent: Tuesday, November 18, 2008 10:39 PM
Subject: Re: [Kenwood] TS850 and SB200
Brian...

You're playing with very high voltages here. I suggest that you read the manual for the Heathkit amp very carefully and follow the tuning instructions to the letter. If you have the plate voltage and current set incorrectly, you're inviting cherry red (not good at all) and possibly arcing 572B tubes, which are quite expensive to replace.
You are correct about the RCA phono jack. That's the input from the exciter (Knwd) to the amplifier.
Also, read the manual for the Knwd TS-850 as it pertains to running the radio with an amplifier.

Good Luck and do take care with that amp. Its voltages are LETHAL.

Darrell,
VA3DG/VE3DDG
--- On Tue, 11/18/08, Brian K. Gaskamp <ka5bkg at sbcglobal.net> wrote:
From: Brian K. Gaskamp <ka5bkg at sbcglobal.net>
Subject: [Kenwood] TS850 and SB200
To: kenwood at mailman.qth.net
Received: Tuesday, November 18, 2008, 10:45 PM
I think I got that last one right so I taking a guess.
I do know its a Heathkit amp.
I would like to run the above combo for the upcoming ARRL 10m contest.
Any suggestions on what I need to do.
I have never ran a amp with a HF radio so I'm open to any and all 
suggestions.
If its any help I do know the back of the amp has a unusual connector, not a 
SO-239.
I want to say like a RCA type jack.
73,
Brian 
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