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National 200 Tranceiver
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Chris Bradshaw
I have a National 200 tranceiver that I got when I first got licensed almost 25 years ago but it hasn't been powered up in at least 20 years. The only known issue is I burned up the audio output transformer years ago and that's when it got put away. I think everything else is good but I know that needs to be replaced and not sure if a standard audio output transformer will work or not. The real question is, is there anything in particular I should look for, be aware of or otherwise fix before I plug this monster power supply up, turn the radio on and burn my house down? surprisingly I don't find any leaking or swollen capacitors and for it's age looks pretty decent on top and underneath. In all honestly this wouldn't be a primary rig but as long as I've had it I have an attachment to it and would like to use it again if possible. I've talked with a few people on 40m AM and they seem to be running old tube radios and while it isn't a requirement to play along, t would be nice to be on one as well.
?Any help would be greatly appreciated. Chris, KS5KY |
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Bring it up slowly with a variac, if possible.? If not, bring it up with a series 60-watt incandescent light bulb - receiver only.? For the transmitter section, you might use a 300-watt incandescent light bulb in series.? As far as the output transformer, Hammond likely has what you need based on the output tube - 6V6?? Antique Electronic Supply, <>, is a good source for these transformers. Dave - W?LEV ? On Sat, May 7, 2022 at 12:06 AM Chris Bradshaw <cabrad74@...> wrote: I have a National 200 tranceiver that I got when I first got licensed almost 25 years ago but it hasn't been powered up in at least 20 years. The only known issue is I burned up the audio output transformer years ago and that's when it got put away. I think everything else is good but I know that needs to be replaced and not sure if a standard audio output transformer will work or not. The real question is, is there anything in particular I should look for, be aware of or otherwise fix before I plug this monster power supply up, turn the radio on and burn my house down? surprisingly I don't find any leaking or swollen capacitors and for it's age looks pretty decent on top and underneath. In all honestly this wouldn't be a primary rig but as long as I've had it I have an attachment to it and would like to use it again if possible. I've talked with a few people on 40m AM and they seem to be running old tube radios and while it isn't a requirement to play along, t would be nice to be on one as well. -- Dave - W?LEV Just Let Darwin Work |
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