DW Holtman <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Sorry for not making myself clear. I'm working on a R-4B.
I was asked in an E-Mail if I have Garey Barrell's CD. Yes, it is a
valuable tool to repair Drake Gear.
Best,
DW Holtman
Garey Barrell wrote:
What receivers/
73, Garey - K4OAH
Atlanta
Drake 2-B, 4-B & C-Line Service CDs
<http://www.k4oah.com>
DW Holtman wrote:
DW Holtman <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
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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
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