[R-390] Variacs and solas: additional thoughts.

[Llgpt at aol.com]

Thank you for the engineers at Hammarlund who had the foresight to include  
many multi tap voltage selections on the SP-600 Power Supply Transformer. Tap # 
 5 is for 130 volts which more closely matches the voltages of today. Most  
people who are operating their SP-600 would be wise to remove it from the  
cabinet or remove the bottom dust cover and look. It probably has the voltage  set 
to the # 4 tap, which is 117 volts. Move it to the # 5 tap for 130 volts,  
the P.S. Transformer will thank you and it will run cooler and the stability  
will more than likely improve.
 
Les Locklear
 
 
In a message dated 4/30/2005 2:45:44 PM Central Daylight Time, ham at cq.nu  
writes:

Hi

A few observations:

Variac's are always fused on the  input side - thank the national  
electric code for this one. Rarely  you will see one with dual fuses,  
but if it only has one fuse you'll  see it on the input.

Constant voltage transformers have one other  oddity. When you check  
the output voltage with a fairly normal AC  voltmeter you never quite  
know what you will get. A true RMS meter  will give you one thing, and  
a peak reading / calibrated to read RMS  meter will give you something  
very different.

Take Care

Bob  Camp
KB8TQ