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Well done! Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

Suggest you try Digitkey part number RV4N103C-ND which is made by Precision Electronics Corp manufacturer number RV4NAYSD103A. This is for a carbon resistance element. If you want a wire wound pot

I sent them an email. Hopefully they have one. I really dont want to pull one out of another SX chassis thats here. But if it comes down to it, thats what I will do

Keith, ? ? You might want to check with this fellow. https://oldradioparts.net/controls.html ? ? ? ? ? ? ? ? ? Joe Connor

Discovered an issue with the pot for the sensitivity. Having intermittent connection and losing audio. That pot was a real pain to get out but managed to work it out. Its a 10k linear, but looking

Thank you for looking this up. Note that a fairly popular movie was made of the novel "Black Beauty" (1877) in 1946. Boy gets girl, girl gets boy, girl gets horse. I probably saw it as a kid but don't

Jim, the trade mark was filed about the time of the first ad, so the words spread quickly

Richard and Jim Because there are significant construction changes as time passed, there are at least 3 types of “black beauty” ads from 1950 to about 1968 And if you want to relate to failures,

DonSince the Sprague molded tubular caps are black and Sprague was making tons of them once they caught on and were used in everything, it is no surprise that they would be called Black Beauty by the

Richard, I saw that long ago , but that needs even more debunking Sent: Tuesday, April 30, 2024 3:41 AM To: [email protected] Subject: Re: [HallicraftersRadios] Sprague capacitors variants

Hi Jim I did not call early molded phenolic resin tubulars by the names “black beauty” or even “telecaps” as they did not use that term early on, but it seems that they became telecaps and

Hi, Are the two 6DQ5s balanced? You can check by removing one (NOT just removing a plate cap connector), and retesting the resting current. Each tube should draw an indicated 0.45V on the 10 Ohm

Sounds like they are a bit gassy. -- Richard Knoppow Los Angeles WB6KBL SKCC 19998

That's perfectly fine. I think a combination is possible. Actually, I think its necessary. Probably my strongest motivation is curiosity.

I installed a different set of tubes and after the warm up period recommended, the idle current is stable and I can set the idle current to 1 VDC well within the range of the bias pot.? Guess the

RichardI completely agree with you, I had just put on my history cap after removing the engineering one!Regards,Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

Well, I think the construction is important because the same trade name was evidently used for multiple similar products. The web site is not of good academic quality since it lacks dates and findable

Didn't notice this previously when testing, but, when the tube bias is set per the manual, the idling current continuously drifts upwards.? For example, I can set the bias at .9 V (read across the 10

RichardI've found this site awhile ago.? No dates are shown for the ads or for the data sheets.?? My interest is in the time line, not the construction of the capacitor.? I've not seen Sprague

After reading this article again I find I disagree with some things in it, for one thing he states that you can't figure out how caps were made by dissecting them, I think that is wrong. While you