So.. Here is where I am with the DX-100. I have been operating it with a pair of 2E26s where the 6146s live and feeding those from the low voltage supply. When I completed the recapping of the high v
I had used four caps rated at 450 volts/100 uF. They were in two pairs series parallel for 100 uF/900 volts. Some hams cautioned me against using so much capacitance. So I removed one pair of the cap
Hi, Bill I was also going to ask if you have a choke input filter -or if you could change the PS filter configuration to choke input to help a bit with the HV. Also, check your line voltage - especia
I was also going to ask if you have a choke input filter -or if you could change the PS filter configuration to choke input to help a bit with the HV. Also, check your line voltage - especially at ni
Hi, Bill Well, I suspect that the light bulbs may be a "tip-off". The do make 130 volt bulbs for folks with line voltage that runs a bit high, but that doesn't help you DX-100 or other appliances. So
Hi Charlie, A little cross multiplication shows that if you had 600 volts when the primary is 110 VAC, then with 130 primary volts you should have 709 Volts. A larger increase takes place between cho
Hi, Bruce Well, I agree. And if I follow your reasoning, it doesn't take much of an increase in line voltage to push the HV from 825 VDC to over 900 VDC., as Bill observe. Might be the choke, but I'd
Tom asked about bleeder current. I didn't try to measure it but I watched the high voltage decay to zero in a very few seconds when I switched it off with no 6146s in the sockets. Line voltages in th
Well, here in Raleigh, I've seen it go a good bit more than 5% high at night. Still, I wonder if Bill could just put some higher voltage electrolytics in there, tune for "maximum smoke" and "let 'er
The DX-100 High voltage is choke input by design. I changed the low voltage supply to choke input as well and the rf stages are behaving very nicely with that. I already think my line is "high" and I
( Maybe I spent too many years around electric utilities) I think that +/- 5% guideline is honored more in the breach than in the observance. In the meter business "480 high-line" was 530 VAC! 73, C
On 01/08/2014 05:19 PM, Charlie Cunningham wrote: Well, here in Raleigh, I've seen it go a good bit more than 5% high at night. Still, I wonder if Bill could just put some higher voltage electrolytic
In my (very distant) youth I came by a DX-100 that had been built from kit by a local, who could never get it to work. I spent a few interesting weekends studying the circuit and the construction, an
So far I haven't found the line voltage lower than 125 Volts and in early afternoon it was at 130 volts. The transmitter was working and no problem with the finals at all before I did the recap. I di
Somewhere around here I have info about adding those 'funny wires' and neutralizing the rig. It was already on my table to do that. I don't plan to use the DX-100 shorter than the 80 meter CW band bu
Well, I agree. And if I follow your reasoning, it doesn't take much of an increase in line voltage to push the HV from 825 VDC to over 900 VDC., as Bill observe. Might be the choke, but I'd be really
Yeah, those old "Benton Harbor Kilowatts" did a pretty good job on AM - not quite as good as a Viking II or a Viking Ranger, but pretty good. Those old 1625 modulators and a real high-level plate-mod
True! - Remember the warm glow of 866 rectifiers? Ever had one "flash-over" from plate to filament? I did once, when, I think in the "heat of battle" I applied the HV too quickly without enough filam