[Heathkit] Heathkit LG-1 (IG-42) signal generator

Dick KF4NS kf4nsradio at verizon.net
Wed Feb 14 18:55:08 EST 2007


I could use some help with some voltage readings. If anyone has a unit 
with the cover off or is willing to open it up, I want to compare what 
I have. I just completed replacing all capacitors (excl. tuning cap) 
and any resistors out of tolerance, along with replacing the  selenium 
rectifier with a silicon diode and load resistor, grounded power cord, 
along with dressing up all leads and replacing weak tubes.  All 
contacts and controls have been cleaned with Deoxit.

Using the tube voltage chart in the manual, my readings on the DMM are 
not too close on several pins. The manual gives no tolerance nor any 
setup criteria so it is a guessing game. I would expect voltages to me 
a bit high due to higher line voltage but some are lower and some neg 
instead of pos. Example: the voltage on the oscillator tube is all 
over the scale depending on the position of the dial  (no, there are 
no shorted plates on condenser). I know that even with 10 Megohm 
impedence it should be buffered for a good reading, but they say in 
the manual that all readings were taken with a VTVM.

Anyway, please contact me directly if you are able to assist.
Thanks and 73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow! 



More information about the Heathkit mailing list