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Old 24th April 2011, 04:18 PM   #3051
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It's worth noting that the Burning Amp front ends are also
happy driving F4 type circuits.

When Wayne was designing the soon-to-be-released XP30
line stage, I requested a couple features:

1) Enough voltage and gain to drive a 300W power follower

2) A low enough output impedance to drive a bank of Fets.

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Old 24th April 2011, 08:19 PM   #3052
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Nelson Pass View Post
It's worth noting that the Burning Amp front ends are also
happy driving F4 type circuits.

.......
yup

and - because they're similar/same as discrete OP/AlephwithoutAlephCCSbutwithbootstrappedshebang - they can be made balanced/X-ed in same way as Aleph became X



Quote:
Originally Posted by Nelson Pass View Post
....

When Wayne was designing the soon-to-be-released XP30
line stage, I requested a couple features:

1) Enough voltage and gain to drive a 300W power follower

2) A low enough output impedance to drive a bank of Fets.

so - good enough to feed revised concept amps ?



will it drive F4 ?
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Old 25th April 2011, 12:40 PM   #3053
cjkpkg is offline cjkpkg  United States
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Quote:
Originally Posted by Nelson Pass View Post
It's worth noting that the Burning Amp front ends are also
happy driving F4 type circuits.

When Wayne was designing the soon-to-be-released XP30
line stage, I requested a couple features:

1) Enough voltage and gain to drive a 300W power follower

2) A low enough output impedance to drive a bank of Fets.

And there are even PCB's available...VERY interesting...It would seem to be fairly easy to integrate this front end into an F4 chassis...
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Old 25th April 2011, 02:55 PM   #3054
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Are there any problems or issues with using computer grade 10k uf caps in the Pass F4 and F5 power supplies other than cost and size? I was surprised to see the small form factor caps in both the commercial and clone products. I am not an engineer but every amp I have ever built has used the computer grade products.
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Old 25th April 2011, 03:18 PM   #3055
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No problem, CG's are LL types and have high surge values, just cost.
Modern ones in that low uF range, as the Panies, aren't half bad though.
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Old 25th April 2011, 05:29 PM   #3056
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ok, but does surge factor have any sonic effect? What is a Panie(s)?

thanks
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Old 26th April 2011, 02:38 PM   #3057
RKH is offline RKH  United States
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Quote:
What is a Panie(s)?
me thinks Panasonic... but I could be incorrect
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Old 26th April 2011, 02:49 PM   #3058
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Quote:
Originally Posted by davelang View Post
ok, but does surge factor have any sonic effect? What is a Panie(s)?

thanks
it's what you call your wife in Polish (panie=lady) and there should be a surge factor involved in response.
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Old 26th April 2011, 04:52 PM   #3059
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My bad, sounded like you turned Panicsonic.

Papa still shops CG's for his main event, though CDE nowadays, instead of Mallory computer grade specials in the Threshold years.

Panasonics are much cheaper (new ones) than special long life types, datasheet and experience tells that they're good.
Even an 85C TS-UP type lasts 50K hrs minimum, has 25% surge capability, good ripple numbers.
CG or off the rack items nowadays has more to do with reliability, less with sound quality.
(i still favor boutique items, but not for wimpy stuff)

See, every J is a joker.
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Old 30th April 2011, 09:00 PM   #3060
cjkpkg is offline cjkpkg  United States
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Got one channel done...Looks like with the sinks I have 250mv will be the max...not bad at all.

Need to get the other channel connected and then take it for a test run with the JFET BOZ...

I am very encouraged by how easy this has gone together so far...

F4
Antek 3218 xformer
Antek chassis
CVILLER amp boards
PDANIEL psu boards
Vishay/Panasonic resistors
FETS etc...from TechDIY - Thanks Jack!

Thank you DIYAUDIO.com!!!

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Last edited by cjkpkg; 30th April 2011 at 09:02 PM.
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