[AMRadio] Voltage check please


Jim Wilhite w5jo at brightok.net
Fri Mar 7 19:20:13 EST 2014


Charlie, are you sure of the voltage?  I use an RCA WV 98(X) and sometimes 
make the mistake of failing to switch the probe from AC/Ohms to DC.  The 
short answer is I fail to make accurate measurements, but I claim the excuse 
of old age.

Jim
W5JO

-----Original Message----- 
From: CL in NC


I need another lucky Heath Apache owner to check a voltage for me when the 
opportunity arises.  The manual calls for 360V on the screens of the EL34's 
and throughout the TX for low B+.  In the process of repairing the 
modulator, I found mine to be about 250V.  If I unload the power supply, I 
get 350V, when I hook the load to it and it only draws about 15MA in STBY, 
it drops to 250V.  The TX operates fine, tunes up with no issues, full power 
out, no ripple on the carrier.  Is this  60 year old typo and it should show 
250V?  The LV xfmr is 300-0-300, the rect is full wave and the filter is cap 
input with a choke, so theoretically, this PS under load should not give 
360V out.

After finding this TX in  a drainage ditch in SC and repairing it's issues, 
it has given me good service for over 21 years.  Perhaps it is starting to 
get cantakerous in it's old age.

Charlie, W4MEC in NC



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