One more thing. If the crystal is driven heavily, it heats up and chirps.
Reducing the amount of feedback in the oscillator can help, but can be
tricky as well. No suggestions where to proceed without knowing the
circuit.
73, Steve K9DCI

"Bill" wrote in message
...
William Mutch wrote:
The anonymous homebrew xmtr I picked up at the AWA meet last
spring has finally make its first QSO, heard 589 in Texas by KE5HQ on 40
CW, but he reports what I sort of knew anyway...the rig has a chirp. The
oscillator is an electron coupled 12BY7, crystal controlled. What are
the cures for chirp ?? Slightly detune the buffer ?? add caps to the
power supply. Trying the easiest things first, how should I proceed ??

The easiest first check is to try another crystal.

-Bill