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Old 20th November 2012, 01:24 PM   #2971
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I should explain myself. Most FW amps are low watts 5w-15w, but some are 25w. The F6 is 30w. The PS voltage is 23-24v on most FW amps. The F6 is also 23v. So, is there some effeciency gained somewhere in the F6?

From 6Moons article. "You've seen this supply many times and here it is again. It's got 18-volt secondaries that you can get from Antek or Plitron."

"As a push-pull Class A amplifier we traditionally expect it to operate in Class A to peaks of twice the value of the bias current. With degeneration a circuit designed to operate at 30Wrms into 8Ω in Class A would by definition leave Class A at 60-watt peaks. "
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Old 20th November 2012, 01:48 PM   #2972
Tea-Bag is offline Tea-Bag  United States
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Here is my P2P F6. Not exactly totally safe construction.

I biased at what I think if 1.5A.

Measuring V across resistors in standard Pass supply.
1.5 x .(4x.47R) in power supply = .176

No big sound evaluation yet, just one mono CHR-70 running no baffle.

I have ordered The Cree SIC Mosfets, and will modify this to use them adding more LED's.
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Old 20th November 2012, 02:05 PM   #2973
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Originally Posted by vdi_nenna View Post
I should explain myself. Most FW amps are low watts 5w-15w, but some are 25w. The F6 is 30w. The PS voltage is 23-24v on most FW amps. The F6 is also 23v. So, is there some effeciency gained somewhere in the F6?

From 6Moons article. "You've seen this supply many times and here it is again. It's got 18-volt secondaries that you can get from Antek or Plitron."

"As a push-pull Class A amplifier we traditionally expect it to operate in Class A to peaks of twice the value of the bias current. With degeneration a circuit designed to operate at 30Wrms into 8Ω in Class A would by definition leave Class A at 60-watt peaks. "
When no degen., the mosfets square law allows one half to run more than twice the bias before the other half cuts off. This for class A power.
There is more power into 8 ohms because less voltage losses due to no degen..

Last edited by bobodioulasso; 20th November 2012 at 02:11 PM.
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Old 20th November 2012, 02:11 PM   #2974
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You a runner Nelson?
I'm a walker.

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Old 20th November 2012, 02:23 PM   #2975
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Old 20th November 2012, 02:26 PM   #2976
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Originally Posted by Nelson Pass View Post
I'm a walker.

Seaside walker ?

Knowing the coast you live in i can appreciate that.

Zen contemplative country....it just misses a cement pilar for ZM to sit on top when he visits......heheheheh

Last edited by CeeVee; 20th November 2012 at 02:28 PM.
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Old 20th November 2012, 02:36 PM   #2977
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Quote:
When no degen., the mosfets square law allows one half to run more than twice the bias before the other half cuts off.
Thanks bobodioulasso!
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Old 20th November 2012, 03:09 PM   #2978
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Keep in mind, if you should go before your wife everything will probably go in the dumpster soon after your demise. Nothing personal. Just part of the grieving process for women.
My wife is of that opinion too; except her motive is cleaning rather than grieving. But my Threshold S/150 will be buried by my side or I'll will it to diyAudio's future museum of Pass Antiquities.
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Old 20th November 2012, 03:25 PM   #2979
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sort of following on from that and relating to what Antoinel said in post 2927...I was just thinking(v. dangerous for me) that if Papa has all the SS stock then there is little point in him designing for us(diyers) because we can't build such designs without the devices(unobtanium).......

so what is Papa going to do with all that stock!!:

a) build like J2(not for diy) and keep some back for failure replacement(what failure!)....

b) release some, or design for those lucky enough to have a stash.
c) scrap the stock
d) find drop in replacement

I was just thinking, that's all

Papa?
Unfortunately, diy F6 is unfinished business. I have a stash of 4 R100As and that is no consolation; R100A appear to be obsoleteium . DIY F6 has no spare parts;and there is not a clear solution for its new output stage.
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Old 20th November 2012, 03:46 PM   #2980
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I'm a walker.

old Bull

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