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Old 9th December 2008, 12:40 PM   #2151
cviller is offline cviller  Denmark
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Quote:
Originally posted by labjr
Culture, I still feel the outputs should be farther apart for better heat dissipation like you can see on the original F5.

I'm still open for doing a small GB of my layout (including a little cleanup).

http://www.diyaudio.com/forums/showt...36#post1672336
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Old 9th December 2008, 01:55 PM   #2152
vonfilm is offline vonfilm  United States
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I would be interested in participating in a group buy for F5 PCB's.
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Old 9th December 2008, 02:06 PM   #2153
Tea-Bag is offline Tea-Bag  United States
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Default PCB's

Quote:
Originally posted by cviller



I'm still open for doing a small GB of my layout (including a little cleanup).

http://www.diyaudio.com/forums/showt...36#post1672336

Quote:
Originally posted by vonfilm
I would be interested in participating in a group buy for F5 PCB's.

Need blessing. Maybe commercial F5 isn't sold out. So we need to wait - or Papa wants to publish boards still to monitor our greedy behavior.
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Old 9th December 2008, 02:13 PM   #2154
cviller is offline cviller  Denmark
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Please place posts related to group buy here:
Gb: F5 Pcb
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Old 9th December 2008, 02:37 PM   #2155
vonfilm is offline vonfilm  United States
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I would love to get the Pass-DIY version. It is no longer mentioned as upcoming on Papa's website. Perhaps Mr. Pass can comment on its availability time frame.
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Old 9th December 2008, 03:55 PM   #2156
culture is offline culture  Netherlands
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Quote:
Originally posted by labjr
Culture, I still feel the outputs should be farther apart for better heat dissipation as you can see on the original F5.
Hi labjr,

My guess is that if six fets in an F4 on the same size board works fine this shouldn't be a problem either, i could be wrong though...
In post #2136 you can see a picture of the sinks i use and i think the fet placement isn't that bad this way. I also have a few heatsinks witch are more stretched out, i might use a few extension wires to place them further apart (if i decide to build an other F5).

cheers,

c.
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Old 9th December 2008, 09:27 PM   #2157
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Quote:
Originally posted by vonfilm
I would love to get the Pass-DIY version. It is no longer mentioned as upcoming on Papa's website. Perhaps Mr. Pass can comment on its availability time frame.
It's on the list, but it will be a while, so you might want to just go ahead
with the group buy.

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Old 10th December 2008, 02:35 PM   #2158
sonidos is offline sonidos  United States
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Default speaker efficiency...is it critical?

Reading the Pass Labs forums has me jazzed!

Build on my B1 has been slow since the birth of my soon a few weeks ago, but I'm almost there.

I'm confused about the discussions regarding speaker efficiency and I'm not sure if the F5 will be adequate to drive my Spica TC-50s. They were rated at 84 dB/W/m at nominal 4 ohm impedance. This doesn't sound like a whole lotta efficiency.

The F5 sounds tantalizing to build, but will my Spicas sound pfffft with the F5 powering them?
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Old 10th December 2008, 03:19 PM   #2159
labjr is offline labjr  United States
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Default Re: speaker efficiency...is it critical?

Quote:
Originally posted by sonidos
Reading the Pass Labs forums has me jazzed!

Build on my B1 has been slow since the birth of my soon a few weeks ago, but I'm almost there.

I'm confused about the discussions regarding speaker efficiency and I'm not sure if the F5 will be adequate to drive my Spica TC-50s. They were rated at 84 dB/W/m at nominal 4 ohm impedance. This doesn't sound like a whole lotta efficiency.

The F5 sounds tantalizing to build, but will my Spicas sound pfffft with the F5 powering them?
That's about the least efficient speaker I've ever seen. I almost bought a pair of them once. I would think you'd need more power.

However, some amplifiers sound surprisingly louder than their ratings would have you believe. I'm not sure if the F5 is one of them.
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Old 10th December 2008, 03:24 PM   #2160
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hi.. i have 2x20 volts 250watts(i think it is not very quality)ac transformer..is it possible to supply f5 with this transformer?.what is the max dc value of the amp?.i think i will put 1ohm 10watts resistor between bridge diode and transformer..what do you think about this?does it reduce the supply noise too?thanks
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