[Kenwood] TS-520 VFO prob's

[J. Michael Thurman]

Greetings,

I have a TS-520 that has started show some odd VFO instability.   The 
VDC going in is a steady 9 V.  The VAC coming out is 
steady.  However, at times the frequency will fluctuate up to 50 kHz 
up and down.   Yes, it is intermittent.  Some times is does it as 
soon as I turn it on...only to settle down...and then act up 
again.  Some times it is steady until I key the rig.

So, any of you that have seen this, is it more likely that the 
capacitors in the VFO have degraded or the transistors?   What did you find?

My next step to pull the VFO and check internal voltages and check 
cap values.  Hopefully, it will decide to act up while I'm looking at it.

73 and TIA,
de WN5T

Michael


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