RF capacitors ID check

[Opcom]

Is there a catalog for the old CRL doorknob caps anywhere?

I have five of these in parallel and would like to reduce to one, but don't know how well they handle RF.

CRL
500pF 30KVDC
134-630

When I look up CRL, I get unrelated stuff or a Chinese company.

[KA2DZT]

Is there a catalog for the old CRL doorknob caps anywhere?

I have five of these in parallel and would like to reduce to one, but don't know how well they handle RF.

CRL
500pF 30KVDC
134-630

When I look up CRL, I get unrelated stuff or a Chinese company.

Back when they were used in TVs, they didn't mention RF in catalogs.  I can recheck some info I have but I'll have to dig it out, maybe later tonight.

Fred

[Opcom]

Please do, if you do not mind.
CRL seems to have disappeared, no catalogs online and only vague advice about using them for RF.
I have no problem with using just one piece for 'low' power like 200W, but not sure about full tilt.

[KA2DZT]

CRL is Centralab.  They did make RF doorknobs.  The part numbers were all 850, 858, 853,854,855, 857, and 859.  859 has the highest current rating 30amps up to 30mHz.  All were rated up to 30mHz at various current.  Some are NPO others various neg temp coeff.  Capacitance range from 5pfd to 1000pfd.  Under number 850 two have no current rating for some reason, they're marked Hi-K 500pfd and 1000pfd  Voltage ratings range from 5KV-20KV

Check the list prices 1960,  850-858 series 4.50   853,854,855 series 3.00  857 series  12-14.00   859 series  90.00

The type used for TV had "T" part numbers  TV-20, 500pfd-20KV TEST 35KV,   TV1-503 and TV8-503 both 500pfd-30KV TEST 45KV  No RF ratings for the TV type

So far I haven't found the number you posted 134-630,  may be numbers used later than 1960.  I try to locate more info in my stacks of catalogs, papers etc.

Fred

[Opcom]

From what you have said, I found this page.

http://www.ohio.edu/people/cookt/centralab.html

It's obvious I have TV series caps here in the TX, even if they do not say TV-30, they do not look like the RF models.
I'm hesitant to use just one, with the QRO set. Maybe I can find another kind.

This is related to reducing capacitance that may be killing my audio highs, and there are a few other culprits. It's just that I have the RF deck out now, and so it is time to review those caps.

[KA2DZT]

Goggle  centralab capacitors,  you'll find a lot more.  The TV caps should work fine for the plate choke bypass.  Very little RF at that point.  The blocking cap needs to be a RF cap at full tilt.  I've used TV caps at low power 50 watts seems to work FB.

Fred

[KA0HCP]

http://www.vintage-radio.net/forum/showthread.php?t=10042

Here is a UK radio forum which has helped me with my British 1946 AVO All Wave Oscillator signal generator.