DW Holtman <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Hello,
I wrote last week on low AVC voltage. I have done more troubleshooting and have come up with the following.
The problem is the AVC voltage as measured at TP2 should swing from around -1.5 to -30 VDC as the RF Gain pot is rotated from CW to CCW respectively. My radio only goes from -1 to around -10.
I have swapped all affected tubes to see if they were somehow loading down the circuit, V1,4,5 and 9 ( the tubes that use AVC), no help. Q4 is good, but the collector voltage is low of course with the RF Gain fully CCW.
The voltage and resistance on all of the tubes whose gain is affected by the AVC check good with the RF Gain fully CW, and not nearly enough negative voltage on the control grid with the RF Gain Fully CCW.
Any ideas or suggestions? Thank you in advance. Best, DW Holtman ---------------------------------------------------------------------- Submissions: [email protected] 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 ----------------------------------------------------------------------
