Trim capacitor

[zamproject]

Hi all

I'm looking for mica capacitor, pressure trim like Arco series 300 or 400 that can handle high voltage (250/500), in the 500/1000p range for max value
Is there any manufacturer that offer this kind of component today ? I just find nothing...
(I know it's possible to source NOS Arco)

Best
Zam

 

[abbey road d enfer]

I don't think you can find it in new parts. The available ones are limited to about 120pF.
Can you describe what you want to use them for?

 

[CJ]

https://www.surplussales.com/Variables/Compression/CompCap1.html

 

[zamproject]

Can you describe what you want to use them for?

Tube oscillator

 

[abbey road d enfer]

Tube oscillator

OK, what nominal frequency range. Is it fixed frequency? I believe you could use a combo of a small fixed cap and one of the currently available ones.
Unless you want to cover a large range with only a trimmer cap as the variable element...

 

[zamproject]

The frequency is about 7 octave 20 to 2k (tube syth) with 4 RC network octave bank (keyboard only 4 octaves)
The C part is already using fixed capacitors in parallel, I can pre set more accurately for sure the fixed part of C
The original parts varies about 200p(+/-100) to 500p(+/-250) depending of octave setting (this is 4 tuning capacitors)
What is the ref/brand of the 120pF you have in mind ?

I just have a look at some PTFE (not mica) from Vishay...100p 300v but only 10 cycles of turn...

 

[abbey road d enfer]

What is the ref/brand of the 120pF you have in mind ?

https://www.amazon.fr/NNGUBIU-conde...ords=trimmer+capacitor&qid=1634918019&sr=8-12I can't definitely vouch for them!
There's also that
https://www.amazon.fr/224pF-condens...ords=trimmer+capacitor&qid=1634918199&sr=8-48Honestly, it was more to show you the paucity of offer, ratger than a recommendation.

 

[zamproject]

Tks Abbey, I'll see what I do, probably NOS Arco is the best option finally
For sure there is lot of them around but the small ceramic don't hold the spec I need...

Best
Zam