[Heathkit] SB-230

[jeremy-ca]

The 230 was popular some years ago as an easy conversion to 6M and even 432.
One conversion Ive seen that works well is to use the conduction cooled 
4CX250B (forgot the number) in a super cathode drive similar to the THP 
HL1K/A. The tube is almost a giveaway and conversion is rather simple.

Ive converted over a dozen to 6M and typical paid price was $250-275 with a 
full output 8873 even at Dayton a decade ago. That tube was also used in 
some Henry VHF amps as well as some point to point commercial gear. I have 
an 8874 that someone sawed off one side of the radiator and soldered on a 
brass plate; suprisingly it works nice and cool in the SB-230.

At least the 8873 is easier and cheaper to find than the single use 8875's 
in the Dentron MLA-2500.

Carl
KM1H



----- Original Message ----- 
From: "Glen Zook" <gzook at yahoo.com>
To: "Richard" <theprof at texoma.net>; <heathkit at mailman.qth.net>
Sent: Wednesday, October 25, 2006 8:25 PM
Subject: Re: [Heathkit] SB-230


> Actually, there was one at HamCom this past time!  The
> guy wanted like $300 for it.  Don't know if it went or
> not, but it was there the afternoon of the 2nd day.
> Was located in the hallway, not in the main room or
> outside.
>
> Frankly, even with a good 8873 they really don't go
> for much over the $200 to $250 range because of the
> price of replacing the tube.  You just don't know how
> long the final is going to last.  Now the "asking"
> price may be higher, but the "going" price is usually
> in the price range quoted or even less.
>
> Glen, K9STH
>
>
> --- Richard <theprof at texoma.net> wrote:
>
> I haven't seen one at HAM-COM the last few years.
>
> How much should I expect to pay other than on the
> e*pay place:)
>
>
>
>
>
>
>
>
>
> Glen, K9STH
>
> Website:  http://k9sth.com
>
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