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dsavitsk

Prototypers wanted

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Got everything (almost) put together. Went to home depot today to get some screws for the iec module and other stuff but forgot to get the stupid solder lug for te safety ground :( now I must wait until day after to go though the initial testing. Bleh.

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Any news on the new transformer revision? I'll hold on to my precious lats until then.

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Great! If that weeds out the hum problems some folks have been having then I'm game. My HD650 is terribly underamped from the otherwise decent FiiO E10.

I just hope that I don't take the lazy road and buy a second hand M-stage or something.

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Really cool. Have you managed to cut down the hum or is it just due to proximity of components?

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Looks great, Doug.

 

Was all Tom's doing. I didn't know he was going to do it until it was done :)

 

Really cool. Have you managed to cut down the hum or is it just due to proximity of components?

 

Little adjustments keep reducing it little by little. We prototyped some different PTs that reduced one type of hum, but due to weird core saturation issues, caused a different kind. I have yet another proto sitting here waiting to be tested which I might get to this week.

 

But, the hum is really pretty low. I am alarmist about such things as my test is generally that if I can tell an amp is on, it is too noisy. The Torpedo is to the point where on a very quiet night with no heater/ac/road/tv/etc. noise, you can just tell it is on ... depending on the sensitivity of the headphones. So, the hum is low enough for a $300 amp, but probably not a $2000 one.

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My brother has never mentioned hearing any hum with his (prototype). I'll have to ask him if he has ever noticed it. I didn't when I was testing it, but never tried any really efficient cans with it.

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"Hmm ... I'm going to have to buy a white sharpie."  - what I said to the laser-etch guy when I first saw the results on the black back plates. 8)  (220V vs. 120V indication)

Edited by TomB

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