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"Over time the bottom Bella of the tube will definitely turn red even with no drive." The brand new tubes did this right out of the box...no time elapsed. [email protected]> wrote:

Thank you; I did not see this ammeter in the instructions manual. It seems difficult to manufacture power electronic tubes with a solid grid structure. Chinese manufactures often have a fragile grid.

Oh Sorry, normal idle current is 125–160ma. Over time the bottom Bella of the tube will definitely turn red even with no drive. Sent from the all new AOL app for iOS

Thanks for the info, Louis. To be clear, the photo you're referencing is from Bob W4JFA, not from me or my amplifier. My tubes from Tom Rausch of CTR Engineering do have white bases.

Thanks Bob. My tubes glow similarly in the lower plate portion when keyed without drive, but only a dull red. The photo you sent makes the plate look white hot...maybe it is an overexposed photo.

Francois, In addition to the meter described in your quote from the manual, there is another meter dedicated to Iplate. It's a 0-1A meter. [email protected]> wrote:

How do you measure plate current? Manual <http://www.tentec.com/wp-content/uploads/2016/05/model_422_centurion_owner_manual.pdf> -- F1AMM Fran?ois De la part de Bob Envoyé : lundi 15 juillet 2024

The tube in that photo, does that tube have a white base to it? ?It looks like there is no white base and the white looks to be a reflection of the filament light. ?If this is so, that tube didn’t

I hope the attached picture shows. This is a 3-500z with approx 90 - 100mA plate current after about 60 - 90 seconds. Bob W4JFA [email protected]> wrote:

I'd like to query the collective knowledge about a Ten-Tec Centurion amplifier I've been working on, if you'd be so kind as to respond: I found that one tube had a cathode to grid short. I ordered and

So I feel I found the culprit. I stuffed the on 572B on my tube tester just to see if the filament would light up. Nada! So I took a closer inspection of the tube and found the reason for no filament

Indeed, I kludged together an interface to a 12" long resistor and now I'm under 2:1 to 2 GHz.? There are a couple of "resonances" but I think that's because of the kludge (I was wanting to see if

I have a few transformer out of a hi power rf generator marked Camden Transformer Co. I have not been able to find any info on this company? The transformers are marked 1976. Any help would be

This needs to go into the 'files' section.

A friend sent me this sheet. I thought I would post it in case anyone needs it at a later date.? This also applies to many of the RF generators. C

GM! After seeing that I am positively certain the reason you don't have a flat match is someone kluged the short resistor in place with a copper pipe to extend it to the feed point. Putting the

So really the point is that I want the load to operate according to specifications:? VSWR 1.1:1 0-1 GHz; 1.25:1 1-2 GHz.? This one can't make spec above 30 MHz. Here is another picture of the

Typ, the local power company will give u a few gallons? of xfmr oil.? ?I used that in the heath dl....and also my HB? 8 gallon DL.? ?But neither are used above 10m. Mineral oil will work too,

First time I ever set foot in an SB-200 and it doesn’t look too complicated. But I want to make sure I have it squared away before returning to its owner. My buddy bought this for $200. It looks

In some counties Baby Oil is a mineral oil and suitable for electrical cooling. It is also possible to drain the oil from a discarded electric radiator which in my experience is similar but less