"Gene McCalmont" <[EMAIL PROTECTED]> made an utterence to the drakelist gang ---------------------------------------------------------------------- To my Esteemed Colleges: After some 25+ years of service, my L-4PS power supply for my L-4B started suffering from electronic arthritis and required a freshening. It now sports new HV capacitors, bleeder resistors, modern HV diodes with transient suppression, a "soft start" module from Harbach and other minor mechanical goodies. It now looks as good as it did originally and functions better than when new... which, except for the transformer, it is.
However, I am saddened by the fact that this beauty will last only another 25 years before requiring another "freshening." Frankly, what was DRAKE thinking when they designed and built this equipment in the first place? I've got shoes older than that! So, I have considered using a fan to help expel the accumulated heat, thinking it may extend the service life of the components. And, therein lies the dilemma. The supply is wired for 220VAC. I have a 120VAC fan rated at 2100rpm and 370mA. I would like to slow the fan speed somewhat to reduce the noise, and tap the supply for the 120VAC power. I understand that my 220VAC supply side is really two 110VAC lines and that I should be able to tap off the switched side of the 220VAC (after the circuit breaker) to natural and achieve the desired 110VAC. Therefore, when the amp is switched on, the switched side energizes and the fan pulls it's required power between the switched side and natural, but this seems like risky behavior to me. When it comes to HV power supplies (anything over 12V) I start getting nervous and concerned that my sweaty palms will provide an excellent return to ground! Currently, the L-4PS is playing happily downstairs in the shack and the L-4B is delivering rated power. What is your experience with cooling the L-4PS? Or, should I, "Don't worry. Be happy"? Sincerest regards; Gene W5DDW Gene McCalmont 270 Oak Ridge Ln. Argyle Texas 76226 ---------------------------------------------------------------------- On Behalf of "Gene McCalmont" <[EMAIL PROTECTED]> Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
