52 ma seems like in the ball park. Those meters were "probably" +/- 5%, a typical figure for that vintage meter. If I remember correctly, Drake didn't use precision resistors for shunts and multipliers. Your DMM is certainly many more times accurate than the meter movement ever was in the first place.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Wednesday, March 03, 2004 12:47 PM To: [EMAIL PROTECTED] Subject: [drakelist] T-4XB apparent vs actual plate current OK, Garey-I checked the meter, and it showed .16 volts thru the connections on the back of the housing. The shunt resistor measures 3.1 ohms in circuit, and 3.3 ohms out. Using the 3.1 ohm figure, that would make the actual current around 52 mA. This is with the pot on the back of the AC-4 set to read an apparent 70 mA on the meter. Assuming my cheapie DMM is anywhere near accurate, I am seeing a significantly higher appparent vs actual plate idle current reading. I looked through the T-4XB manual, and did not find anything specific as to meter calibration. What is the usual cure for this situation? On the bright side, the AC ripple in the transmit signal is now gone with the replacement of the old C4 cap in the AC-4 PS. 73, Don, W5EI Troup, TX ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ---------------------------------------------------------------------- ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
