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Old 9th January 2013, 03:30 PM   #2531
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I've not read a good review on the Lightspeed - I've always opted for a good ladder attenuator.
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Old 9th January 2013, 03:31 PM   #2532
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Neat looking. I should attempt to sink my mosfets right to the bottom of my case. I've bent them over and have heat sinks on them, but they take up a bit too much room for my case.
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Old 9th January 2013, 03:35 PM   #2533
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All depends on how HOT ROD you are going.

At 300mA you will start to need heatsinks.

I'm running 10R and everything is nice and cool. At 4R7 even the 2E heatsinks were getting VERY WARM (50 Degrees C)
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Last edited by KatieandDad; 9th January 2013 at 03:37 PM.
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Old 9th January 2013, 03:36 PM   #2534
Salas is offline Salas  Greece
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Quote:
Originally Posted by bambadoo View Post
Thanks again..
Had an old cabinett. Sinked the dcb1 to the chassis and put it on.
Waited about 10 minutes and did some readings.

Vout: 9.86Vdc and -9.86Vdc
DCoffset : 3.1mV and 3.0mV
Over the power resistors: 1.66V (IRFB9240 side) and 1.55V (IRFB240 side..

These are good readings right?

Have ordered a "potted" 50VA 2*15V transformer.. Should be here tomorrow I guess.

My old lightspeed attenuators have been taken up again.
Good readings.
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Old 9th January 2013, 03:51 PM   #2535
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Quote:
Originally Posted by KatieandDad View Post
I've not read a good review on the Lightspeed - I've always opted for a good ladder attenuator.
REALLY?! You haven't looked very hard -- there are tons of positive reviews on this site. The main thread is one of the most popular on DIY Audio. The commercial version is Stereophile Class A IIRC.

Some people don't have a system with enough resolution to hear the difference between a Lightspeed and a ladder, so they opt for the simpler design of the ladder. That makes sense. But most people who hear both prefer the Lightspeed.
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Old 10th January 2013, 04:17 PM   #2536
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Originally Posted by Salas View Post
Good choices.

If you really got space in the box, I would recommend 4 monstrous 2.2uF Russian capacitors to make two 4.4uF pairs bypassing each pair with 0.1uF monstrous Russian Teflon. I believe they exceed the German silver in oil type even when in that config for far far less.

2 2uF 250V PIO Capacitors K75 10 Lot of 4 Hi End | eBay

0 1uF 5 600V Teflon Hi End Capacitors ft 3 Lot of 2 | eBay

Maybe ask for combined shipping fees when coming from the same vendor.
Salas

If used without bypass how good Is quality related to mundorf silver oil and obbligato premium gold
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Old 10th January 2013, 05:11 PM   #2537
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Salas

If used without bypass how good Is quality related to mundorf silver oil and obbligato premium gold
Nice links. I bought some Russian teflons but they are very bad sounding. Iron sealing and magnetic legs.
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Old 10th January 2013, 05:28 PM   #2538
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?? All the Russian teflons I've used (FT-3s) were sealed with teflon on the ends and all the metal parts were aluminum, and they sounded great.

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Nice links. I bought some Russian teflons but they are very bad sounding. Iron sealing and magnetic legs.
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Old 10th January 2013, 05:31 PM   #2539
Renron is offline Renron  United States
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?? All the Russian teflons I've used (FT-3s) were sealed with teflon on the ends and all the metal parts were aluminum, and they sounded great.
+1
And they take forever to break in
Ron
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Old 10th January 2013, 05:37 PM   #2540
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+1
And they take forever to break in
Ron
??? I wonder how great sounding is like ! A LOT of treble ?
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