Ceramic Capacitors v's Tantalem Capacitors

[Amie]

They should be stable with applied voltage. At 33p measurement strays are very significant. How are you measuring them?

Hi.

No measuring, just part of a misbehaving hf oscillator, blocking link capacitor to varactor diode, (fine tune control), measured OK with the meter.

Replaced with a different type (mica) all OK, RS tech support said I must have gotten close to the working voltage. (1Kv! I was using 30volts).

They replaced them with another five that were still no good.

Noying, but wrote the fiver off now.

Thanks,
Amie.