[Kenwood] TS850 and SB200

Wed Nov 19 11:07:12 EST 2008

Yes, please be aware of this, the keying line on the Sb 200 is at 150 volts 
DC... At least you can use a small 12 vdc relay to key the map from the 
TS-850... Better than blowing out your keying circuit in the radio.
BTW the 572Bs are not that expensive as tubes go, about 45ドル each, you can 
probaly get a matched pair for less than 100ドル
In the long run you might also want to consider upgrades to the amp.... 
Harbach sells power supply upgrades, a soft keying circuit and an inrush 
delay circuit that will extend the life of the tubes.... See
http://www.harbachelectronics.com/main/page_home.html
73 Dave WB2FTX
----- Original Message ----- 
From: "Michael Brown" <k9mi at sbcglobal.net>
To: <kenwood at mailman.qth.net>
Sent: Tuesday, November 18, 2008 11:54 PM
Subject: Re: [Kenwood] TS850 and SB200
> 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
>>> ----- Original Message ----- 
> From: Darrell Drake
> To: kenwood at mailman.qth.net ; Brian K. Gaskamp
> Sent: Tuesday, November 18, 2008 23:39
> 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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