[ARC5] T-19 first run issues.

J Mcvey ac2eu at yahoo.com
Sun Apr 19 13:25:20 EDT 2020


Just got this ARC-5 system wired up and going. Even the rack had hacked/dry wires that needed rewiring.The T-19 was recapped, cleaned, etc.  

I have this strange problem with a hum in the carrier.  It sounds like a rig with a bad filter cap. I rechecked my wiring, etc, but everything is OK.The only other "symptom" is low output, about 2  Amps in CW mode . ( It's not the meter because I use the the same one with the SCR274 which will go 3+ amps). I'm using an A-27 dummy load

I'm thinking that it may be an alignment issue where the finals are off-resonance and drawing too much current compared to the carrier amplitude and inducing a ripple modulation? 
It's real subtle when looking at it on a scope, but obvious on a radio.
The Dynamotor is almost ripple free , putting out around 590V under load. 

Any thoughts?


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