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Old 18th February 2012, 03:41 PM   #1651
evanc is online now evanc  United States
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Thanks... Again I feel like a trained monkey. Yes the speakers are big, just ask my wife. The bass drivers and tweeter are padded down to match the beta12lta at about 97 db/w/m The amp is a dual mono f5 dc coupled. It drives the beta12 and the tweeters. The system seems to offer plenty of gain. I'll tell you better when the house is empty. The heatsinks are cool after a few hours of playing so I guess it's time to up the current.
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Old 18th February 2012, 04:40 PM   #1652
Salas is offline Salas  Greece
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More current would be a sound stage bonus.
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Old 19th February 2012, 10:32 PM   #1653
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Originally Posted by Tea-Bag View Post
Did you up the bias beyond 200ma? That brought imaging up substaintially in my setup, which looks a lot like yours now. Some day I will go for the Mundorf's - if for nothing more than to express what I think of them for the masses,,,
I ordered Cerafines, Silmics and Panasonic FCs. I'm going to put IC female sockets on the board until I make my choice, so I can change them without soldering.

Mine is biased to 300ma with aluminium L's and cpu heatsinks glued to the L's (cpu heatsinks kindly donated by Teabag). I'm using 5R mills. If I go to 600ma, will these sinks take it or should I look into replacing them with heftier ones?

If I go to 500-600ma bias, does it matter what resistor I use? I have some Kiwame 5w 2.7Rs carbon film, or should I go with the Mills 2.xR?

Teabag, mine looks a lot like yours because I'm following your recommendations for upgrades from a few months back!

Thanks again.
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Old 20th February 2012, 12:19 AM   #1654
Tea-Bag is offline Tea-Bag  United States
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My heatsinks seem fine, running 3.3R. Mine are now the Dales 6.5W type that ~50ppm tempco. The problem became I needed to drill more holes in the casing to keep the components a bit cooler.

The Carbon Films gave much higher tempco - which would not be my choice.
The Mills are probably a really good choice. But there is much honor in using what you got
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Old 23rd February 2012, 03:56 AM   #1655
syklab is offline syklab  Hong Kong
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Hi Tea-Bag,
CADDOCK|MP930-5.00-1%|RESISTOR, CURRENT SENSE, 5OHM | e絡盟 Hong Kong

Found some 5R30W at element14, will that be suitable ? Hard to find 3.3R, they have 2R.
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Old 23rd February 2012, 12:25 PM   #1656
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Hi Tea-Bag,
CADDOCK|MP930-5.00-1%|RESISTOR, CURRENT SENSE, 5OHM | e絡盟 Hong Kong

Found some 5R30W at element14, will that be suitable ? Hard to find 3.3R, they have 2R.
I've heard of people blowing them in power supplies, and wirewounds are better for this. I use them as source resistors only. I think a few other members have used caddocks, but I won't speak for them. Probably with caps used here, we are okay.

2R should be fine if you've got some big sinks for it.
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Old 23rd February 2012, 12:33 PM   #1657
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I've heard of people blowing them in power supplies, and wirewounds are better for this.
These are 30W resistors... if used in well deisgned circuit and correctly heatsinked I can't see how they can blow...

BTW they sound great
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Old 23rd February 2012, 12:35 PM   #1658
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These are 30W resistors... if used in well deisgned circuit and correctly heatsinked I can't see how they can blow...

BTW they sound great
I am not an expert, but was warned by people have tried them before - in power amps however.
I agree they are fine sounding, as well as Mills.
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Old 23rd February 2012, 11:49 PM   #1659
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I tried 3.3 R and changed the sinks. Is there a big heat difference from the 10R?

It seems the IRF's are running at room temp. I can keep my fingers on them for a long time.

How hot should they get with 3.3R?

I am getting sound out of the dcb1. Sounds pretty good actually.
How and what can I measure on those irf's to be sure they ar not burnt?
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Old 23rd February 2012, 11:52 PM   #1660
Salas is offline Salas  Greece
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Voltage between gate and source. You should see ~4V or something. Also measure voltage across the 3R3. I=V/R the actual running current, yet more confirmation you got a running CCS.
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