On Sun, 5 Jun 2011 13:13:08 -0700 (PDT), Neil M Califano wrote: >Does Sherwood or anyone offer an improved audio amp for the R-4C? Does the new >amp draw more current?
Velleman offers an audio amp kit that is very close to the Sherwood design. It's a hi-fi amp, so the circuit should be tweaked (change one or two caps) to limit it to communications bandwith, but it's considerably cheaper. Current drain hasn't been a concern since the stock class A amp is disabled in the process, but it should be done in conjuntion with the established power supply mods. http://www.sherweng.com/ham.html#kits http://www.vellemanusa.com/us/enu/product/view/?id=350529 73, -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! "Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime." HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
