However, during our tests, we have noticed that PullTube has trouble completing the download when handling videos that are longer that 2 minutes. PullTube proposes a streamlined workflow for quickly downloading videos from YouTube or Vimeo, provides control over the output quality, and enables you to extract the audio to MP3 or M4A files. Get offline access to videos hosted online in just a few steps You can also add the quality info to the video’s name and choose to quit the app when all downloads are completed. Via the PullTube Settings panel, you can change the default download location and the default MP3 bitrate (320Kbps, 256Kbps, 128Kbps, 64Kbps). When configuring a download, you get to select the output quality (highest, 4K, HD or regular with different resolutions) or choose to export only the audio to an M4A or MP3 file. PullTube will start fetching the video data right away so you can see the video name, duration, and a small thumbnail. Download videos hosted on YouTube or Vimeo to different output sizes and formats Worth mentioning is that, if PullTube detects that the video is part of a playlist, will offer to download the entire collection: will fetch the data for each entry and handle the downloads consecutively. Note that you can also add a video by dropping the link on top of the PullTube window. The PullTube user interface is represented by a small window where you get to quickly paste the video URL. Video downloader that can import links with drag and drop and can detect playlists As long as its not overdone and turns into an oscillator anyway.Sharing videos via online hosting services, such as YouTube or Vimeo is a common practice, yet streaming the content might not work as expected if you have a slow internet connection. And a little inductance in the sense resistors would allow one to null out the OT leakage reactance as well. As the outputs draw more current, the drive voltages would increase to make up for OT winding R losses. Just split some of that 300 Ohm cathode bias resistor up for individual tube current sensing sent back to the driver cathodes (P Fdbks). The "local" (excluding OT) N Fdbk to the driver tube cathodes (Knight schematic) would allow one to add in some negative resistance easily to cancel the OT winding resistance. Maybe some 3rd H is desirable for bass slam, especially if the OT is not quite up to it, I'm not sure what the explanation is really. But I am still puzzled that most of the more revered tubes DO have this plate curvature. Took me a long time to figure out why some tubes (pentode mode) had an optimum Zload instead of a monotonic optimum like triodes. The flatter plate curves would seem to allow better efficiency and lower distortion. The old circuit uses (Shade?) feedback, similar RH SE amps feedback, only push pull feedback. With about 45V drop on a 5Y3, about a 450V to a 470V Center Tap High Voltage secondary will give about 265VDC to 279VDC, including a 4V drop in the 10uF (middle of first ripple) and a 7V drop in the choke (100 Ohm DCR, and 70mA draw). Use 90 degree orientation relative to the output transformer, and put some space between them and the output transformer. This will have good ripple filtering, but will add weight and expense (choke).īe sure to line up the choke and power transformer, so their fields do not introduce hum in the output transformer. You might use a 10uF input cap (easier on the 5Y3), then perhaps a 5 Henry choke, then the 40uF cap, followed by the resistor and the other 40uF cap. However, any imbalance of the tubes and transformer now appears as hum in the speaker. ![]() The power supply is CRC, and does not have much ripple filtering.įor push pull, a good portion of the ripple is cancelled out because it is common mode on the output transformer. ![]() The 5Y3 rectifier applications show a 10uF capacitor, not a 40uF cap (rather large). The screen dictates the absolute maximum B+Ī typical application of 6V6 push pull is 250V to 285V on the screen and the plate, with an output transformer of 8000 to 10000 Ohms.
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