F5 power amplifier - Page 749

udailey · 21st March 2010, 09:58 PM

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

umut1001 · 21st March 2010, 10:03 PM

Rifa peh 169 is better than tsha i think

nigelwright7557 · 21st March 2010, 10:04 PM

Quote:

Originally Posted by umut1001

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.

udailey · 21st March 2010, 10:15 PM

Quote:

Originally Posted by umut1001

Rifa peh 169 is better than tsha i think

I think you missed my point, plus it was pointed at the guy using 40kuF.

umut1001 · 21st March 2010, 10:34 PM

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

bear · 21st March 2010, 11:30 PM

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...

_-_-bear

a.wayne · 22nd March 2010, 01:02 AM

Remember my Ducks ...............

bear · 04:31 AM

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.

_-_-bear

EUVL · 05:55 AM

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

sekess · 22nd March 2010, 10:23 AM

Quote:

Originally Posted by labjr

Is there a disadvantage of balanced or bridged?

I'm interested in this myself. What are the pros and cons?

Thanks,
Steve

21st March 2010, 09:58 PM	#7481
udailey Passive Aggressive diyAudio Member Join Date: Mar 2008	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 __________________ You can purchase LDRs anytime to build a standard LDR attenuator or to build my new LDR Attenuator "A Lighter Note". Email me. diyldr@gmail.com

21st March 2010, 10:03 PM	#7482
umut1001 diyAudio Member Join Date: Mar 2007 Location: Istanbul	Rifa peh 169 is better than tsha i think __________________ My New and vintage capacitor store: http://stores.ebay.com/Paradise-of-H...dio-components

21st March 2010, 10:34 PM	#7485
umut1001 diyAudio Member Join Date: Mar 2007 Location: Istanbul	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 __________________ My New and vintage capacitor store: http://stores.ebay.com/Paradise-of-H...dio-components

21st March 2010, 11:30 PM	#7486
bear diyAudio Member Join Date: Apr 2002 Location: New York State USA	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... _-_-bear __________________ _-_-bear http://www.bearlabs.com ...live within ~60mi of Albany NY? contact me! --

22nd March 2010, 05:53 AM	#7489
EUVL diyAudio Member Join Date: Oct 2003	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 05:55 AM.


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22nd March 2010, 01:02 AM	#7487
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	Remember my Ducks ...............

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