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Well, 4 HT-57's will be OK for a 8877 running hard. I use 6 for a 3CX1000A7 on 2M at 1500W. No drift Carl

I'm guilty too.... tune my roller inductor with 10 watts or so RF. Never "fine tune" with QRO... just null with the capacitors. The noise bridge would be a much better solution. Don W4DNR Quoting

Hi, All- I have followed this discussion on plate blocking caps with great interest. Just wondering if anyone in the group might have a copy of old Sprague literature that might have the specs on some

I've been using a Palstar AT1500CV roller inductor antenna tuner to tune my 260 feet 450 ohm ladder line fed doublet antenna with since 2002 and Palstar makes no recommendations at all in the user

Weight of that tuner is 900kg! https://www.ebay.de/itm/Rohde-Schwarz-Antennenanpassgerat-20KW-Type-HS-9128/ 233275498133?hash=item36504d9e95:g:2FoAAOSwpAhdGcnk 73 Peter _____ From:

I've got wood!

I seem to recall that the Harris "RF Grease" for roller inductors was just Molybedenum Disulphide which is also conductive. Besides moly greases have other attractive properties that is well suited to

Rohde & Schwarz uses no other type of capacitor then mica for their atus. On the photo you see a 200pf mica by Jahre in their 20KW tuner. 73 Peter _____ From: [email protected]

The? problem? with? broadcast? ?mica's (or? any? mica)? is? they? won't handle? ?any current? on? higher? freqs.? But? they are? NPO.? ?Drake used switchable mica's? in their?

Thanks for all the suggestions. The HT57's look like the easiest capacitors to get. Are HT57's now being made in China by HyEnergy? I see a lot of what looks like clone? HT57's for sale on that

How about a CM88 CDE?? The one I have in my hand now is literally bigger than my door knob to the room.? 10KV, 30A @ 1 Mhz.? :) 73/jeff/ac0c alpha-charlie-zero-charlie www.ac0c.com

Call Oren Elliott and ask what they use. They proviided me a blob in a pill bottle decades ago but forget the name. Also Palstar. I wouldnt use anything but what the pros use. Carl

I use lubriplate lithium grease on most of my shafts. Someone recommended it to me years ago. So far, nothing I have used it on has gummed up, and no electrical problems have presented themselves.

I? have a RI-40 ribbon? style (3/8"? x .082")? roller? coil....with? no? lube on? it.? ? Can? I? use? permatex? dielectric? grease? on? it ? My? RI-50 roller? coil? came? with?

Nope,? you? got it? ass backwards.? Measure? the plate? block? cap? current if u don't? believe me.? W8JI, W8ZR, and John? Lyles? also? concur. At? 29? mhz,? the anode? to? chassis?

Not even close at 2.25" wide by 3" tall.. Ive vever used them above 160 anyway and that was in an Omega match of a shunt fed big 4 el 10/15/20 yagis top loaded 100' tower in the mid 80's. Resonant

Jim, Why should the circulating RF current you calculated, depending on Xc of the YC-156, flow through the plate blocking cap? In the 29MHz case most anode capacity will be within the tube and

Those style? caps? are? way? too? big in diam,? like? 4-5" !? ? They? end? up? adding too? much? stray? C.? ?Been? there,? done? that. HT-57? in 200? pf is rated at? ?15A?

The 57/857 are toy sizes, the 859's are for the big boys Carl

I would prefer a single capacitor any time. 73 Peter https://www.ebay.de/itm/for-CCG81-4U-800PF-K-25KV-90KVA-high-frequency-volta