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Old 22nd February 2012, 03:09 PM   #691
hesener is offline hesener  Germany
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Which post are you referring to?
post 603

moot point I guess, after your recent post...
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Old 22nd February 2012, 04:12 PM   #692
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That question was in reply to Juanitox.

As far as a balanced SIT amp goes, there are several possibilties which could be explored including circuits similar to Balanced Zen Lite ZV7, etc. etc. I imagine any of them would be fairly easy (and perhaps educational) to cobble together and I'm sure everyone here would be happy to help if you get stuck.
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Old 22nd February 2012, 06:16 PM   #693
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Assuming we're talking about physical ringing. yes, the 193V will "sing" when excited with sinewaves at a Watt or so starting around 3kHz and peaking around 8kHz. This can be heard a few feet away.

This isn't altogether unusual, and in fact, lots of things will "sing" when excited in this fashion: transformers, heat sinks, light bulbs, chassis, etc. I'm not sure it will interfere with your musical enjoyment, but if it does, there are a couple of options available:

1. Use the big air-core inductor, which also sings, though less audibly.
2. Build something else altogether.
3. Listen to music program at normal levels rather than pure sinewave excitations at 1 Watt.
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Old 22nd February 2012, 06:44 PM   #694
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Originally Posted by Michael Rothacher View Post
Assuming we're talking about physical ringing. yes, the 193V will "sing" when excited with sinewaves at a Watt or so starting around 3kHz and peaking around 8kHz. This can be heard a few feet away.
You may also be able to eliminate the ringing by soaking the choke in hot wax. Make sure to leave it in the hot wax long enough for the whole choke to come up to the wax's temperature so the wax will fully penetrate.

This procedure not recommended for light bulb loads

Roscoe
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Old 22nd February 2012, 06:46 PM   #695
Zen Mod is offline Zen Mod  Serbia
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nuttin' without vacuum chamber .

anyway - it's funny having singin' choke
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Old 22nd February 2012, 06:51 PM   #696
ra7 is offline ra7  United States
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Or put the choke on top of your speaker and use it as a tweeter
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Old 22nd February 2012, 07:04 PM   #697
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Old 22nd February 2012, 08:20 PM   #698
Skorpio is online now Skorpio  Denmark
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Pa is sayin' - if you're making a choice between Aleph CCS and mu - be aware that SS R100 is having lower Ugs (than mosfet) and that's the reason that little bjt in Aleph CCS will be starved ; so - mosfet is preferable

further - in mu , there is no significant difference between SS R100 vs. mosfet , so neither one is preferable from tech/sounding point of view

off course - each of them demands different mu conditions ( values of source resistors)
Will IRFP240 work in mu follower from post #608?
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Old 22nd February 2012, 08:42 PM   #699
Zen Mod is offline Zen Mod  Serbia
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why not

be gentle when turning first time on - both biasing pots on most neg position
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Old 22nd February 2012, 11:40 PM   #700
NYCOne is offline NYCOne  United States
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why not

be gentle when turning first time on - both biasing pots on most neg position
Both pots in the CCS and the bias to the SIT, right?
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