I've noticed the same here with an AL-80B: On 240V, the filament voltage runs >5.5V on a 3-500Z (nominally a 5V tube). I spoke with Ameritron on the phone about the issue and their tech told me that
Hi Alek, Thanks for the response. Personally, I agree with you that it is better to keep the filament voltages in check for a number of reasons. However, here's a pointer to a post (from this list) t
I do feed the ALC output of my AL-80B back to the exciter. The 80B has an ALC sensitivity adjustment on the front panel, so I can somewhat control the PO of the exciter from the amp. However, it is i
Take a look at the Kenwood TS-430S, a rig that was marketed as late as the mid-1980s: It has a carrier control, allowing the power level to be controlled for CW ops and partially for AM, but the only
MIC GAIN control to limit PEP output power to a desired value. The reason is that there is no feedback involved with the MIC GAIN setting -- it just sets a given level of audio amplification -- and a
Or just go to: http://w1rt.us/eimac/ and take it from there -- it's easier. Rob / KD8WK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.c
I am reminded of an exchange between Neils Bohr and a friend. The friend had just discovered a horseshoe nailed above Bohr's door and asked why it was there. "It's supposed to bring good luck", said
I know most rigs employ a delay of some milliseconds between the time when their amp relay closes and RF transmission begins in order to prevent hot keying problems. On some, this is even an adjustab
Thanks to all -- Larry, James and Jim; hope I haven't left anyone out -- who responded to my query about exciter delays. I've squirreled away your emails for future reference. Larry, it looks like yo
I am reminded of the company some years back that marketed "45 Watt CB Radios". Eventually, the FCC caught wind of this and inquired about their enterprise. It turns out they had beefed up the audio
Interesting. I've heard that similar phenomena (and worse) occurred with regularity back when the VOA was running lots of power from their transmitters near Cincinnati, and I had a car once that lit
When I was experimenting with common mode chokes on 160m and 80m, I tried type 77 toroids, and although they worked quite well, they overheated very easily. Type 43 toroids, although spec-wise seemin
Speaking of toroid cores and what you can do with them, what are people's opinion of the following: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=370270095030 Rob _______________________________
Never having had a tetrode amp, I feel compelled to ask: Should you always tune such an amp for a peak reading (within the acceptable range for screen current) and not add a tad bit of loading for li
For those who've thus far missed seeing it: http://video.yahoo.com/watch/8244494?fr=yvmtf _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting
Hmm. So, do you deduct those points earned from everyone who worked them, too? Inquiring minds want to know. Rob / KD8WK _______________________________________________ Amps mailing list Amps@contest
On what? The AL-82, or the AL-80b? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Just curious: I know you say the tube was not in the water, but would an unenergized glass tube be damaged from being submerged in a flood for a day or two? I would think it would not be, although I
I have a friend who removed a rather large picture tube from a console once. I think it was around 27" diagonally. He wanted to dispose of the tube and electronics and re-use the cabinet. The tube wa
I'm not sure what metal it is (or if it is even metal), but a magnet won't stick to the front panel of my AL-80B, so it isn't steel. FWIW, the top/side cover and back are aluminum, but the screws are