Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.3 alpha 4/15/85; site tapa.UUCP 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