[Amps] Chippewa amplifier

John Lyles jtml at losalamos.com
Thu Mar 26 00:40:13 EDT 2015

The SB220 is considered by many to be a light to medium duty amplifier, 
as the cooling fan and the voltage doubler power supply cannot support 
operating those 3-500Z key down for significant time. I have one, but 
haven't seem them for $500 in a number of years.

The Chippewa, unlike the later Warrior, was overbuilt from the start, 
having a separate HV power supply box as big as the PA section. It also 
had a real blower ducted through the two 4-400A chimneys. I have one of 
these also.

I think the two Heathkits represent completely different design goals 
from the company. SB220 was an incredible deal for its capability, no 
doubt. If you just want RF power, and don't mind the limited duty 
factor, its a nice unit.


> ------------------------------
  Message: 2
> Date: Sun, 22 Mar 2015 08:35:09 -0700
> From: Tom Osborne <w7why at frontier.com>
> To: amps at contesting.com
> Subject: Re: [Amps] Chippewa amplifier

> Wow - $1000??
> Be much better off to get a SB-220 for half that.  73
> Tom W7WHY

> On 3/21/2015 10:58 PM, John Lyles wrote:
>> On ebay, I saw a Chippewa model KL-1 without power supply, pair
>> 4-400A, 1960:
>> http://www.ebay.com/itm/Rare-Vintage-Heathkit-Tube-Linear-Amplifier-Chippewa-KL-1-for-Ham-Radio-/281630963209?pt=LH_DefaultDomain_0&hash=item4192837609

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