From pete–(at)–oldaero.com Sun Dec 31 10:52:30 CST 1995
Article: 4724 of rec.audio.tubes
Path: geraldo.cc.utexas.edu!cs.utexas.edu!natinst.com!news-relay.us.dell.com!swrinde!elroy.jpl.nasa.gov!news.msfc.nasa.gov!newsfeed.internetmci.com!in2.uu.net!nntp.news.primenet.com!news.primenet.com!ip181
From: pete–(at)–oldaero.com
Newsgroups: rec.audio.tubes
Subject: Re: Tube design ratings
Date: 31 Dec 1995 03:43:02 -0700
Organization: Primenet Services for the Internet
Lines: 16
Sender: roo–(at)–rimenet.com
Message-ID: <4c5pfm$g9--(at)--nrp1.news.primenet.com>
References: <4b3u80$sr--(at)--hreed.uchc.edu>
X-Posted-By: ip181.lax.primenet.com
X-Newsreader: IBM WebExplorer DLL

Quote from RCA Receiving Tube Manual RC-30;

ABSOLUTE MAXIMUM ratings are the limiting values which should not be exceeded with any tube
of the specified type under any condition of operation. These ratings are not too often used
for receiving types, but are generally used for transmitting and industrial types.

DESIGN CENTER ratings are limiting values which should not be exceeded with a tube of the specified
type having characteristics equal to the published values under normal operating conditions.
These ratings, which include allowances for normal variations in both tube characteristics
and operating conditions, were used for most receiving tube prior to 1957.

DESIGN MAXIMUM ratings are limiting values which should not be exceeded with a tube of the
specified type having characteristics equal to the published values under any conditions of
operation. These ratings include allowances for normal variations in tube characteristics,
but do not provide for variations in operating conditions. Design Maximum ratings were adopted
for receiving tubes in 1957.

 

Buy the Book!

I cleaned up my tab for Sonny Boy's Help Me and made it into a short book. There's a Kindle version for 99 cents, and if you buy the paperback you get the Kindle free.

Playing "Help-Me" In the Style of Sonny Boy Williamson II: A step by step, note for note analysis of some of Sonny Boy's Signature Riffs