Darrell Bellerive <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Garey has confirmed that the schematic that came with my 2-B manual is the proper manual that came with the 2-B from the factory.
My schematic is numbered 124614500. Comp. MySchematic s/n 5735 Late Version C34 0.005uF 0.005uF 0.005uF C63 0.0024uF 0.0024uF 0.001uF C67 0.01uF 0.01uF 0.001uF C80 N/A N/A 0.02uF R47 68k 68k 680k R65 1.5k 1/2w 1.5k 1w 1.5k 1w R71 N/A N/A 33k So now the question becomes, is it worth updating my 2-B to match the latest version from Drake? I would have to change C63, C67, R47, and add R71, C80 and replace the AVC switch with a double pole version. Looks like C67 and R47 are part of a timing circuit in the AVC. Both components have been shifted an order of magnitude from the early 2-B to the late 2-B. C63 is also part of the AVC. I'm not certain as to what it's function is, but I suspect changing it will alter the frequencies that influence the AVC action. Garey already stated that C80 is an additional filter on the Bias supply, and R71 decreases the IF AVC attack time in Slow AVC. Looks like someone already changed R65 to a 1 watt. Should I make the changes or not? 73, Darrell VA7TO On Thursday 24 July 2008 09:26, Garey Barrell wrote: > Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist > gang ---------------------------------------------------------------------- > Darrell - > > There are a few changes between the two versions. > > Comp. s/n 3001 s/n 6290 Loc. > C34 N/A 0.005 uF V2 > C63 0.0024 uF 0.001 V6 > C67 0.01 0.001 V8 > C80 N/A 0.02 V8 > R47 68k 680k V8 > R65 1.5k 1/2W 1.5k 1w V2 > > 73, Garey - K4OAH > Glen Allen, VA > > Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs > <www.k4oah.com> > > Darrell Bellerive wrote: > > Darrell Bellerive <[EMAIL PROTECTED]> made an utterance to the drakelist > > gang > > ---------------------------------------------------------------------- > > Garey, > > > > Are there any more changes that Drake made to the 2-B during it's > > production? > > > > Darrell > -- Darrell Bellerive Amateur Radio Stations VA7TO and VE7CLA Grand Forks, British Columbia, Canada ---------------------------------------------------------------------- Submissions: drakelist@zerobeat.net Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
