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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText>Bob,<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>There is an effort by Dave Cook, WA0TTN, to covert the SB-610 to solid state. That may or may not be what you’re looking for but here is some info for your review.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>He sent an update on his efforts to me in July but I haven’t seen any posts from him since. Since I am directly copying him in on this message, maybe he will let us know how things are going. <o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Here is what Dave said in April in his first summary to this list:<o:p></o:p></p><p class=MsoPlainText>********************************************************<o:p></o:p></p><p class=MsoPlainText>-----Original Message-----<br>From: heathkit-bounces@mailman.qth.net [mailto:heathkit-bounces@mailman.qth.net] On Behalf Of Dave Cook<br>Sent: Thursday, April 07, 2011 7:26 PM<br>To: 'Heathkit List Server'<br>Subject: Re: [Heathkit] SB-610 solid state conversion<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Well first of all, I thank you all for the overwhelming response to my query. What a great group! I think I got the answers I was looking for, and then some. Here's a summary of the responses, both on the reflector and directly to me:<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>1. The general consensus is that converting my SB-610 to solid state is a reasonable idea.<o:p></o:p></p><p class=MsoPlainText>2. I took a look at the SB-614 and HO-5404 schematics. I didn't know these were solid state scopes. But I found they're both using all discrete transistors, c.a. mid-1980's and the circuits seem a bit elaborate when compared with the simplicity of op-amps circuits. Still, I got some good general ideas of how the early inexpensive transistorized scopes were designed.<o:p></o:p></p><p class=MsoPlainText>3. I got my parts order for this project from Mouser today. The HV transistors I'm using for this project are only $0.20 apiece and the wideband low-noise dual op-amps are $0.60 apiece. Kind of difficult to justify buying a junked SB-614 to salvage the circuit board when these parts are so cheap.<o:p></o:p></p><p class=MsoPlainText>4. Several of you expressed interest in collaborating on this. I'll contact you directly, offline.<o:p></o:p></p><p class=MsoPlainText>5. I'll most definitely post my results to the group after my first prototype is completed. It might even be worth a QST article.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Thanks again for all of your opinions and suggestions.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>73, Dave WA0TTN<o:p></o:p></p><p class=MsoPlainText>**********************************************************************<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Chris<o:p></o:p></p><p class=MsoPlainText>W7JPG<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> heath-bounces@puck.nether.net [mailto:heath-bounces@puck.nether.net] <b>On Behalf Of </b>jeffers.rj@xtra.co.nz<br><b>Sent:</b> Friday, October 28, 2011 7:57 PM<br><b>To:</b> heath@puck.nether.net<br><b>Subject:</b> [Heath] SB-610 Monitor Scope<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Has anyone re-built a Heathkit SB-610 Monitor Scope and used a PC Board rather than point to point wiring.<o:p></o:p></p></div><div><p class=MsoNormal>I also have an HO-10 that needs to be re-built and would prefer to use a PC Board rather than point to point wiring.<o:p></o:p></p></div><div><p class=MsoNormal>Bob ZL2AAQ.<o:p></o:p></p></div></div></body></html>