Too high to pump ALC and too high frequency to work the electrolytics. Too close to resolve IM products on most test gear. It has to be something that is well below the lowest audio frequency and rep
Maybe. Maybe not. Since the PEP for normal 100% sine-wave modulated AM is 4 times the carrier power, and the FT101 can distort the audio and make it eight times or more the carrier, it easily could
I do all the time, and when there is significant noise and QRM **LESS** bandwidth improves copy provided that bandwidth is properly centered. If you listen to widefi AM guys, those with the deepest
25 watts carrier? That's 100 watts PEP if you watch the peak envelope power and use the controls properly to maintain that peak level. You'd need a good PEP reading meter. The Ameritron PEP meter is
Do you actually have an application sheet for these tubes in linear amplifier service Will? 73 Tom _______________________________________________ Amps mailing list Amps@contesting.com http://lists.
Will, I'm a little puzzled, and this may be confusing other people also. As I recall you stated quite emphatically everyone should follow the letter of a spec sheet regardless of what factory engine
Hi Will, I'm still not sure I understand fully. I'll try one last time. Will replied: As I understand your answer, because the sweep tubes have no warranty it doesn't really matter how you run them e
Ron, Some anode color is required to keep the tubes gas-free. The gettering agent is the gray powdery coating on the anodes. If the tubes never showed anode color they would go bad. The color is rat
How much RF current flows through the capacitor? Voltage is the easy part. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/l
Why? Q of one small part of a complex system doesn't determine anything by itself. If it did, we'd never be able to build a R/C oscillator circuit now would we? Many of these resistor swamped grid d
Phase shift of the feedback is an issue in any oscillator. The point is things can oscillate with almost any Q if phase is correct and feedback level is high enough. The biggest worry with paper amp
That's because the choke, at the lowest order series resonant point, acts like two back-to-back L networks with very high L and low C. Since the impedance step up and step down closely match, the th
The FL2100 series is notorious for the various mica capacitors being bad. I looked at one that appears to be a record a few months ago. It had about 8 bad mica caps in the tuned input. They also used
Mica isn't bad at a "certain frequency", and the dissipation of one type of mica cannot be directly applied to the complex workings of a component. There are many mica caps that are quite good to 1G
Ian replied: Ian is correct. A short answer to this question sounds clear and definitive, but is almost always misleading. Like the mica statement, the answer depends heavily on the application AND
So we are told that some manufacturers derate some mica caps above 5MHz. Others have caps that in slightly different applications have ratings that are high. Some mica caps can handle high currents i
David, It isn't unusual to find a few bad input circuit capacitors along with some failed output circuit caps. I've never noticed any other amplifier series that had so many small cap failures as th
Another problem people commonly miss is voltage drop in the filament choke. A normal properly sized filament choke has a few tenths of a volt AC drop across the windings from filament current. This i
The ICOM 751A generates FM trash when the internal switching supply is used. The problem is the VCO coil is next to the transformer in the switching supply module, and the magnetic flux changes perme
Filament or emission life is virtually never an issue for amateur service. All the worry comes from commercial applications, where the tube runs 24/ 7/ 52 weeks a year. In amateur service the primar