The Wildest Thing About Electric Cable Isn't Even How Disgusting It is > 자유게시판

• 목록
• 답변
• 글쓰기
• 게시판 리스트 옵션
  • 수정
  • 삭제

These patches take paint nicely. Works well for knobs too! Johnson, and Heathkit (with sure reservations) will do nicely. That's not a promise no different cap will fail- they are 70 years previous. Besides, there are heaps of 50 yr previous tubes on the market working simply fine. Nope - there are many tube dealers attending hamfests and antique radio swap meets, and promoting by way of mail order. When attending a hamfest, ask a number of the sellers if they have any vintage gear on the market. Tubes, high voltage caps, vintage microphones and connectors may be discovered lurking right here! Generally, as a "starter" boatanchor, 50's vintage gear is probably the most effective method to go. The very best option to discover a boatanchor is to let other hams in your space know you might be eager about them. My goal- private success from answering the problem of those units aside- is to give the radios the best chance to be preserved past my time as their temporary care-taker. You will say much less nasty words if you are taking your time. There was a time when I'd say "substitute every electrolytic and each paper and each Micamold" as a matter of course. You will say bad words if this occurs!

Assume many electrolytic and paper caps are bad. But we should not assume in these cases that capacitors are the offender; resistance and voltage chart checks are your friends. Exception: Leaky cathode bypasses, especially the one on the Audio PA, need to be checked individually, since there isn't any present path to find them with out filament voltage. I typically change the line cord (they normally need it anyway) and either put an in-line fuseholder, or some of the Heath-kind fused plugs within the radio. The primary model of this FAQ was put collectively by John Brewer WB5OAU/4 for the original boatanchors e-mail record. John Brewer WB5OAU This subject might easily fill many pages. John Brewer WB5OAU This can be a question that has as many solutions as there are individuals. While you're under the tables rummage thru the packing containers of parts found below there for elements that may come in helpful restoring your new-old treasure. WD40 or Scotts Liquid Gold (my favourite) applied to a clean wrinkle end will do a great job of restoring the lustre.

The collet in every permits 1/sixteen adj to permit for finish thickness. Speaking of working desks, you will grow to be good at carpentry in case you spend much time as a boatanchor operator. Collins, Hammarlund, Hallicrafters, and National are all good radios. Q-suggestions are good to have too. Checking the fuse before buy is a good factor to do too. Many 'anchors can have the unsuitable worth fuse in it. Electrolytics should read a very high worth after settling. Check high resistance, and excessive wattage resistors for correct worth. As an illustration- I've revived three TCS receivers these days and i find wonky resistors to be an excellent larger problem than capacitors. If you don't have a manual (and even if you do) word which socket the tube got here from so that you could substitute them accurately. Measure the grid of the tube fed by the capacitor coupling. The very-high enter impedance of the VTVM may be "spoofed" by an electro-static charge on the grid facet of the capacitor plate. A crown on the underside side is good too. If you're in a hurry (and have cash) advertisements in Electric Radio magazine, the Ham Trader Yellow Sheets, or your local packet BBS are good places to look.

Also take a look at Bry's Boneyard Price Guide to see what typical asking prices are. If the audio is distorted, search for open bypasses in the 1st Audio and Audio PA. S-meter climb as the full audio comes out from the 6 watt output stage as you crank back the RF acquire. A screwdriver touched at tube bases will usually change the "motorboating" and inform you which of them stage is oscillating, or use a scope. If the oscillation modifications with tuning, the Mixer/Converter stage is oscillating (this occurred with one of many RAX receivers- open cathode bypass on the Converter). 10V on the tube cathode. If (after a reasonable "reform" time) it is pulling more than 30 mA, your cathode bypass is leaking. Take your time and enjoy. After allowing "reforming" time for the electrolytic caps (and no filament voltage), at 100V on the buss, it was drawing 20mA. 100V was dropping somewhere and at 20mA, the leak was turning that present into 2 Watts of heat. Word of mouth once again will work wonders at getting tubes, high voltage caps, and the like shoved in your course. If it's open, you a minimum of know what you're getting into. In lots of radios (not in RAX however in others), there are coupling caps that go to grids which can be leaky.