#46
|
||||
|
||||
Quote:
I just did a quick tutorial on the 70V line matching tx's and how to figure impedances between the primary (70V) and secondaries, and I think I can use one of the Jensens I have. The secondaries are labeled as (Watts) 4, 2, 1, 1/2, 1/4, and 1/8 into an "8 ohm speaker". If my math is correct - following the innernut tutorials I watched (using the 70V primary and the 1/2 watt secondary): W=E^2/R W=5000/R 1/2=5000/R R = 5000*W(1/2) R(Impedance) = 10,000 ohms. Gawd, I hope I didn't screw up the simple algebra. Been a reeeeaaaaalllllly long time. Am I on the right track, as far as the output of the final UX201A impedance?
__________________
Francis; i for him, e for her All things audio, baby! |
#47
|
||||
|
||||
Edit I see you are progressing on the pa transformer the way I would... I'm too tired to check the math, but it looks like your on the right track.
On the barn parts radios Google the audio output tube I'd number for each tube with the " tube datasheet" tacked onto the end of the search string...you should ring PDFs of pages from old RCA tube manuals and the like scan through the specs and look for plate resistance of the tube anything reasonably close to 11k should have a transformer that will work.....you can also order a new part from Hammond. Hammond makes new transformers for tube gear and probably has something that will work (try to get a part 5w or less or your paying for extra power your output tube will never be able to deliver to it).
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 Last edited by Electronic M; 08-21-2019 at 09:58 AM. |
#48
|
||||
|
||||
Quote:
Fran
__________________
Francis; i for him, e for her All things audio, baby! |
|
|