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[Amps] SB220 mystique

To: amps@contesting.com
Subject: [Amps] SB220 mystique
From: "John Lyles" <jtml@losalamos.com>
Reply-to: jtml@vla.com
Date: Tue, 10 Feb 2009 19:21:18 -0700
List-post: <amps@contesting.com">mailto:amps@contesting.com>
I've always considered the 220 as sort of a Dynaco project. David Hafler 
created the Dynakits and brought high quality but reasonably priced 'component' 
audio gear to thousands of stereophiles. Eventually, there was a following of 
modifiers that POOGed the Dynas, the PAS, the SC70, the Mk iiis, etc. Many mod 
articles were found in the 1980s in Audio Amateur, Glass Audio and other 
magazines. Everyone had their favorite hack, as the Dynas were easy to cut 
into, to add circuitry, to make tweaks and 'improve' the sound. I got Haflers 
amlifiers and preamps, and they all were modified and 'improved'. I still have 
three of the amplifiers around, 20+ years later. Just like the 220. The SB220 
is a similar box, in that there are lots of mods out there, some good and some 
not so, but despite that, hams love to mess with it and add the features that 
it missed. Others are just content with a working amplifier, no frills, no 
microprocessor. 
I lucked into a 220 in 1992, late in the game, at a local hamfest for $250 or 
so. I made plenty of changes to mine, it is now customized to my liking, and 
I'll keep using it. Simple yet powerful with a pair of 500Z.  

73
John
K5PRO

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