Curt -
Just to avoid overlooking the obvious.... Have you tried substituting
V1, V2, V3 and V4? AVC2 is applied to each of these, and is what is
supposed to cut them off in standby.
Nine volts should be more than enough to cut off all four of those
tubes. You may also have a resistor that has gone up in value. Check
the voltage on V1, Pin 1; V2, Pin 2; V3, Pin 7 and V4, Pin 7. Each one
should be about -6 to -8V with the receiver in standby.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
[email protected] wrote:
Per suggestions and notes in the CD, I measured voltage at the mute
terminals using VTVM. RF gain at max the voltage is 7VDC, RF gain at
minumum it is 15 VDC. Removing V1, V2, V4, or V5 makes no
difference. The AVC is set per the instructions. Any other ideas?
73, Curt KB5JO
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