Hi Dan,
when you have a good pre F4 is really marvelous. He has not the resolution of F5, but I preferred him, because he made a much more relaxed sound and articulated things in a way F5 could not do, despite the better highs, better bass, better resolution of F5. A reviewer called him the "most kiffed of the bunch"...
when you have a good pre F4 is really marvelous. He has not the resolution of F5, but I preferred him, because he made a much more relaxed sound and articulated things in a way F5 could not do, despite the better highs, better bass, better resolution of F5. A reviewer called him the "most kiffed of the bunch"...
WOW...I have spent the last 2 weeks reading through this thread!
I finally pulled the trigger on building an F4 to use with my Aikido pre(5687/6dj8 currently).
So far I have:
-Cviller boards
-antek xformer (had a spare 18v 300va kicking around)
-purchased the antek case in ebay...looks to be somewhere between a 3U and 4U in size of heatsink - dimensions and mass seem to be on par with the modushop 4U my F5 is in
-PSU will be a spare brianGT board I have laying around 3X39,000uF per rail
-tech-diy full F4 kit
-misc stuff from mouser
The only thing that remains are some #6 allen bolts for the MOSFETS.
I am thinking that with this chassis I will be limited to the recommended stock values...
Pics to follow shortly!
I have a feeling that this path will lead me to the infamous pumpkin pre! although I am glad to hear about the good results with aikido.
I finally pulled the trigger on building an F4 to use with my Aikido pre(5687/6dj8 currently).
So far I have:
-Cviller boards
-antek xformer (had a spare 18v 300va kicking around)
-purchased the antek case in ebay...looks to be somewhere between a 3U and 4U in size of heatsink - dimensions and mass seem to be on par with the modushop 4U my F5 is in
-PSU will be a spare brianGT board I have laying around 3X39,000uF per rail
-tech-diy full F4 kit
-misc stuff from mouser
The only thing that remains are some #6 allen bolts for the MOSFETS.
I am thinking that with this chassis I will be limited to the recommended stock values...
Pics to follow shortly!
I have a feeling that this path will lead me to the infamous pumpkin pre! although I am glad to hear about the good results with aikido.
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.
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.
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
....
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 ?
Attachments
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...
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.
it's what you call your wife in Polish (panie=lady) and there should be a surge factor involved in response.
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.
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.
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!!!
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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