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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
These caps are MMKP and might be more prone to failing at the ends than FKP caps. Still, I believe they'll work for relatively low currents of the QCW :)
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Well I was first going to get this thing working as a regular DRSSTC, then figure out how to make it QCW. Kinda hoping that I'd be able to witch between the two, so yeah I'd need to find some beefy caps for the tank.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
Hi Grenadier I am workinig on gatering up the parts for QCW and I am working on the converter first. I am hopping on geting some input from others because I have some of thease russian doorknob caps that have a RF rating
your doorknob caps that you all ready have might be suitible. I considered taking a bunch and paralleling them on some aluminuim plates. the advantage is that the coil can be tuned by removing caps from a bank. The G27N120BN is a good choice, they are 500 watt devices.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
teravolt wrote ...
Hi Grenadier I am workinig on gatering up the parts for QCW and I am working on the converter first. I am hopping on geting some input from others because I have some of thease russian doorknob caps that have a RF rating
your doorknob caps that you all ready have might be suitible. I considered taking a bunch and paralleling them on some aluminuim plates. the advantage is that the coil can be tuned by removing caps from a bank. The G27N120BN is a good choice, they are 500 watt devices.
The KVI 3 caps are lossy ceramic type, they are useless for anything but low frequencies and DC. The general rule is, if the cap doesn't have kVAR rating on it, it's probably not intended to run any reactive power at all.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
Marko, I have seen pictures of thease caps as tank caps in rf tube amplifier equipment. they may not be as saperior as mica but I think thay will do at least for me. have you tried using them before.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Marko wrote ...
teravolt wrote ...
Hi Grenadier I am workinig on gatering up the parts for QCW and I am working on the converter first. I am hopping on geting some input from others because I have some of thease russian doorknob caps that have a RF rating
your doorknob caps that you all ready have might be suitible. I considered taking a bunch and paralleling them on some aluminuim plates. the advantage is that the coil can be tuned by removing caps from a bank. The G27N120BN is a good choice, they are 500 watt devices.
The KVI 3 caps are lossy ceramic type, they are useless for anything but low frequencies and DC. The general rule is, if the cap doesn't have kVAR rating on it, it's probably not intended to run any reactive power at all.
Marko
I have some smaller ones of the same type, here is the datasheet
CAPACITY: 470 pF (+20 -20 %)
TEST Voltage: 24.000 VDC
MAX. WORKING Voltage: 16.000 VDC
MAX. WORKING current at f=30MHz: 15A (200 A pulse)
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QCW coil
