The Heath VF-1 is a very stable and well-built VFO. As is typical of tube-based VFO’s, it requires a period of time to stabilize after turn-on, but then provides excellent performance.
There are some tricks available to stabilize it earlier, such as leaving a 6 watt bulb burning in it at all times, putting it on a timer, etc.
It outputs about one watt and can even be used as a QRP transmitter if the output is run through a suitable tuner.
This page includes links to basic information about the unit, some improvements and other information.
This link provides an overview of the VF-1, courtesy of W6ZE.
Here is a copy of the VF-1 manual.
W7EKB has some very helpful information and improvements.
W7DTG comments about replacing the 6AU6 with a 6AH6.
Some comments about the VF-1 and HG-10 VFO’s are from VE6KQ, at this link.
Converting the VF-1 to Solid State, by W1EBW
21 Mhz modifications (ARRL Hints & Kinks #1)
21 Mhz modifications (ARRL Hints & Kinks #2)
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