----- Original Message -----
From: "Curt Nixon" <cptc...@flash.net>
To: "Jim Shorney" <jshor...@inebraska.com>
Cc: <drakelist@zerobeat.net>
Sent: Sunday, April 17, 2011 5:13 PM
Subject: Re: [Drakelist] R-4B audio problem traced to low
beta Q7 (2N3394)
HP had some mighty fine audio distortion analyzers and
reference sine equipment in the 60's--we used it on the
McIntosh stuff a lot.
600 series if I recall...same size as my RF gen. 19" rack
mount..50 Lbs
Curt
General Radio also made a good low distortion audio
genrator and harmonic distortion meter. Probably most of
them were sold for broadcast station use in doing proof of
performance testing but they were useful for production
testing also. The generator had residual distortion on the
order of 0.1%, high by modern standards but certainly low
enough for routine testing of single ended tube amplifiers.
I think the residual of the meter was lower. This is
mid-1950's stuff. By the mid 1960s -hp- had much better
generators and analysers available.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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