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Old 21st March 2010, 08:58 PM   #7481
udailey is offline udailey  United States
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More capacitance more capacitance more capacitance. Papa uses about 100kuF more. Power supply is super important and more capacitance means more everything, not just bass. Overdo it. Dont regret it. How about those Panasonic TSHA? 10,000uf at 35V and you could buy 10 for about $50. They are really good caps.
Uriah
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Old 21st March 2010, 09:03 PM   #7482
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Rifa peh 169 is better than tsha i think
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Old 21st March 2010, 09:04 PM   #7483
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Quote:
Originally Posted by umut1001 View Post
I have rifa peh169 caps 63v 10000uf x10 pieces.I will parallel them.They are big caps but very high quality.What do you think about it?Are they much more for F5 amp?
There is the inrush current to take into consideration. This might mean an inrush current limiter circuit to stop blowing fuses.
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Old 21st March 2010, 09:15 PM   #7484
udailey is offline udailey  United States
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Originally Posted by umut1001 View Post
Rifa peh 169 is better than tsha i think
I think you missed my point, plus it was pointed at the guy using 40kuF.
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Old 21st March 2010, 09:34 PM   #7485
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I am not a capacitor expert but i know that esr esl and ripple current is more important than the capacitance.And see that rifas are old but excellent caps.Thanks
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Old 21st March 2010, 10:30 PM   #7486
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Default TOSHIBA Matching Update

Hey F5'ers...

A quick update.

I did further measurements regarding the actual spread of the bias points for the batch of Js & Ks that I have on hand. It appears that the biggest spread is on the order of <200mvdc gate bias for the same current matching point. This is good, since the curve tracer displays minutia very well, and it looked like the spread was far far more than that. It's actually rather small in practice.

What this means is that for the double Mosfet (2 per rail) boards pairs from ends of the spread will not really be far apart at all and should work fine. Pairs for the standard one Mosfet per rail F5 will be easy.

I'll be posting to Swap early in the week, I need to get some ducks in a row first...



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Old 22nd March 2010, 12:02 AM   #7487
a.wayne is offline a.wayne  United States
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Old 22nd March 2010, 03:28 AM   #7488
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Default Only a few Tosh's for sale in Swap area

I only have a few sets for sale in the swap area...

First come first served.
If the demand is huge, I can go and buy a really large batch...
Post there, not here.

there is here:
TOSHIBA MOSFETS

Awayne, out of this batch there was no possibility to find the number that you wanted. Zilch. I would need a batch of 200-400 per type to find the number you wanted...

So, post up if you want them, even if I run out (and I will, there aren't that many to begin with...) otherwise I won't want to go out and buy several hundreds of each type myself.



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Last edited by bear; 22nd March 2010 at 03:31 AM.
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Old 22nd March 2010, 04:53 AM   #7489
EUVL is offline EUVL  Europe
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Are they matched at room temperature or at steady state on heat sink ?

Curve tracer matched Quad Comps are a must for those serious builders for Xed F5.

Can your curve tracer output data in digital format for post processing ?


Patrick

Last edited by EUVL; 22nd March 2010 at 04:55 AM.
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Old 22nd March 2010, 09:23 AM   #7490
sekess is offline sekess  United States
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Default Balanced or Bridged

Quote:
Originally Posted by labjr View Post
Is there a disadvantage of balanced or bridged?
I'm interested in this myself. What are the pros and cons?

Thanks,
Steve
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