I added a chassis view of the Ugly amp. to my Web site. Warning. This is a high-res JPEG file, so it takes a while to download. However, you can pretty much see what's what. The grid roller coil [fro
It didn't download at all with Netscape. However with IE5 it did. I can't see the parasitic suppressors. What is the specification ? It looks like an 8877. -- FAQ on WWW: http://www.contesting.com/a
2A @ 7kV. VHF suppression was discussed in a previous post. cheers - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting
WHY? Why would a rheostat stop doing what a rheostat is supposed to do??? I agree with your comment. I am surprised though that the caps are that poor. I know even most "quality RF" caps (mica or oth
? Hang onto your hat. The nichrome resistance wire that the rheostat was made from was subject to disintegration from atmospheric effects. The graphite contact in the movable arm would crumble. The
So according to these "experts" a rheostat is not capable of varying the magnitude of an AC voltage. Go figure. Hey, I have a rheostat on my filament AND on my HV primary. Poor is a relative term. I
A rheostat in the HV transformer primary is bananas. poor. I disagree. You gotta short the cap with wide Cu foil and measure the resonance with a dipmeter.. cheers, Jon - Rich..., 805.386.3734, www.
Why? Too much loss? Granted, you might not need to use it very often if ever, but I can set my operating voltage to be whatever I want it to be. No, it isn't changed, and I probably wouldn't change i
No. The current is not semi-constant. . ? Never, ever. All the rheostat can do is create unregulation. ? And when the anode current changes, what then? - Rich..., 805.386.3734, www.vcnet.com/measure
No, because it will wreck the regulation. Most amp PSUs use capacative filters after the rectifier to provide the HV supply. A feature of capacative filtering is the high ratio of the peak current s
Are we sure the "rheostat" isn't in the HV metering divider to adjust the HV meter? That would make a damm site more sense. Mark WB8JKR _______________________________________________________________
Yes. The rheostat is a 50w unit. It is in the primary of the filament transformer. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions:
I remember seeing in QST a primary voltage regulator ( with tyristors ) sensing the secondary high voltage by means of a voltage divider. Much better than a reostat or a Variac. In a filament stabili
I know Rich, I was talking about the one Jon claimed to have in his HV supply. Mark WB8JKR ___________________________________________________________________ Get the Internet just the way you want i
Oh! Duh! Wake up and smell the coffee, Jon...... :-) My mistake in terminology. Yes, yes, yes, of course you would want to use a variac and not a rheostat in the HV primary. And that is what I use -
--Original Message-- From: Hans Goldschmidt <sm5ki@algonet.se> To: G0MJW <mike@g0mjw.freeserve.co.uk>; Jon Ogden <jono@enteract.com>; AMPS <amps@contesting.com> To: <amps@contesting.com> Date: 04 Nov