Test load resistors calculated (Thanks again Tom!) scrounged, DY-105 tested satisfactorily, interconnecting cable fabricated, (the time consuming part) 

GRC-9 on the air last night! 

CW only so far, put an RBN spot into AZ from SoCal on 3550. Tonight I’ll locate my stash of T-17 mics and try it out on AM. Maybe even crash the AMI net with it, ha!

Thanks everyone!
Jason WA6BBQ

On Mon, Apr 27, 2026 at 10:39 Jason Sogolow via groups.io <w6iee.73=gmail.com@groups.io> wrote:
Hi, I’d like to test and verify that my DY-105B is putting out correct and safe voltages before attempting to power up my GRC-9 with it. 

I can trick the dynamotor into starting and can see appropriate HV, but all the low voltage circuits apparently want to see a load, and that load appears to be integral to regulation. 

Open circuit, the 1.5v supply shows 24 volts… Not confidence inspiring. Blowing up one 3v flashlight bulb is one too many. 

Has anyone come up with test loads that would cause the thing to operate as expected?

Thanks,
Jason WA6BBQ. 
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