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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!ihnp4!tapa!larry
From: larry@tapa.UUCP (Larry Pajakowski)
Newsgroups: net.ham-radio
Subject: Re: Replacement FET for Heath scopes (and other scope comments)
Message-ID: <154@tapa.UUCP>
Date: Sat, 9-Nov-85 11:58:14 EST
Article-I.D.: tapa.154
Posted: Sat Nov  9 11:58:14 1985
Date-Received: Sun, 10-Nov-85 09:25:23 EST
References: <21464@mgweed.UUCP>
Organization: Pata Systems, Deerfield, IL
Lines: 14

I have had good service from an IO-4510 Heath scope with one exception
similar to Bob's.  The front end is a FET differential pair which has a bad
DC drift with temperature (the 4510 is DC coupled).  Once after leaving it
on in the upright position for 3 days the DC offset (kinda dumb anyway) the
DC offset went too far for the trimmer pot rendering it useless.

Has anybody got any ideas about a cheap fast front end, DC to about 25mhz.
which I can use to replace the fet front end?

By the way the scope is very nice.  The bandwidth specs. are conservitive
and the trigger works very well.

Larry WA9QOO
ihnp4!tapa!larry