gofar99 wrote:
Hi, New addition to the amp family. A stereo integrated power amp with volume and balance controls and sufficient gain not to need a separate preamp. A more complete write up to follow later. It sounds just like the other Oddblocks (no surprise there). The extra stage has a gain of about 9 as shown with about a 50% loss in the balance control. Note also that a capacitive multiplier filter is used in place of the LR8 regulator. Only one channel of the filter section is shown so you need two of the CMs. The input stage of the amp is run full gain and can handle up to about 4 VRMS inputs without attenuation. It ought to be fine for most uses. If not then series resistors can be added to form a voltage divider there. The reason for not having the volume control there is to minimize hum and noise. As show it is really quiet. Under 1 millivolt of hum and noise at the output with full volume inputs shorted. I used a 6NO60 delay tube for warm up delay, feel free to do something else. I recommend a delay as the solid state rectifiers will hit the filters with over 525 VDC if the tubes are cold. Operating voltage is 475.
Good listening
Bruce
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Stereo 20 OCT 2020.jpg
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Oddwatt Integrated Stereo 10-12-2020.jpg
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Oddwatt StereoPS 10-12-2020.jpg
Hi Bruce!
It looks awesome!
I wonder what are your opinions on the power transformer, because i´m running the same setup but with the
https://edcorusa.com/xpwr173 "Power transformer for a 120V or 240V, 50/60Hz. line to 700V (350-0-350) at 400mA center tapped, 100V at 10mA, 12V at 1.5A and 6.3V (3.15-0-3.15) at 7A center tapped."
- Does it buzz? (mine a little bit but acceptable)
- Does it get really hot? (mine goes up to 65C)
Please let me know.
Stay healthy!
Cheers,
Miguel
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