F5 power amplifier - Page 52

vdi_nenna · 30th April 2008, 12:47 AM

Quote:

and the cheapskates may be left behind, or at least listening in mono.

People 'round these parts will make you an amp out of a paper clip, tooth paste and a ball of twine if that's all they had. Bring it on!!!

Tea-Bag · 30th April 2008, 01:14 AM

Quote:

Originally posted by vdi_nenna

People 'round these parts will make you an amp out of a paper clip, tooth paste and a ball of twine if that's all they had. Bring it on!!!

I didn't mean to offend all the MacGyvers out there.
Your talking to someone who buys surplus heat sinks and mostly used music. Of course I pretend/try to be eco-concious...but really cheap cheap at heart

jameshillj · 30th April 2008, 05:17 AM

Tim,
Thanks and "YGM"!

Babowana · 30th April 2008, 10:26 AM

Quote:

Originally posted by mithomas

I suspect the fistwhat F5 will become a very popular DIY project.

Number is not a matter...
Anyone wants to build is all about...
Papa is giving us good opportunities...

narinari2106 · 30th April 2008, 10:58 AM

Few days ago, I complete my F5 project based on only this thread's info.
Now I use it, I can simply say it's great amp!!

The change point:

1. Power Voltage is 19V, bias is now set for 0.8A.
2. do not use R15,R16,TH1,TH2.
3. Q5 is changed to 2SA1020, Q6 is changed to 2SC2655

My impression:
1)Easy to set bias and very stable
I made ZV5 with JFET inputs before, but F5 is more stable.
That's very important point for PassDIY beginner I think.
I was very scared the bias setting of ZV5, but now I am not.

2)Very tight bass, clear mid and high
I prefer the sound of F5 than ZV5 with JFET inputs.

Now I'm happy with my F5.
Thank you for Mr.Pass, Your amplifier stimulated my creation mind.

Dennis Hui · 30th April 2008, 11:24 AM

narinari2106,

Congratulations and thank you for sharing with
us your impressions.

Cheers,
Dennis

zeonrider · 30th April 2008, 11:30 AM

narinari2106, do you have some pic. of amp.?

Regards zeoN_Rider

Nicola · 30th April 2008, 11:54 AM

Quote:

Originally posted by Nelson Pass

I would say not quite either.

:-) remarquable, like Adelph Oracle... Thanks

How noisy is the amps, is it close(r) to F3 (100uV, rather noisy when driving 106db horns) or to F2 (dead silent)?

Still have no idea about power and other spec (except that it is all more of everything.....), but i reckon i'll have to wait for the AXP article to come in the mail box or wait until it appears in FisRtWatt web site. Both fine

Regards

DaveM · 30th April 2008, 01:36 PM

Maybe I missed this, but what are people using for jfets? I can't seem to locate a source for the 2SJ108. Will a Fairchild j108 do? Mouser has them.

Thanks

Dennis Hui · 30th April 2008, 01:52 PM

Quote:

Originally posted by DaveM
Maybe I missed this, but what are people using for jfets? I can't seem to locate a source for the 2SJ108. Will a Fairchild j108 do? Mouser has them.

Thanks

I imagine many people will be using 2sk170/2sj74.

Cheers,
Dennis

30th April 2008, 05:17 AM	#513
jameshillj diyAudio Member Join Date: Feb 2005 Location: Melbourne, Aust	Tim, Thanks and "YGM"! __________________ ... jh

30th April 2008, 10:58 AM	#515
narinari2106 diyAudio Member Join Date: Feb 2008	F5 is great poweramp Few days ago, I complete my F5 project based on only this thread's info. Now I use it, I can simply say it's great amp!! The change point: 1. Power Voltage is 19V, bias is now set for 0.8A. 2. do not use R15,R16,TH1,TH2. 3. Q5 is changed to 2SA1020, Q6 is changed to 2SC2655 My impression: 1)Easy to set bias and very stable I made ZV5 with JFET inputs before, but F5 is more stable. That's very important point for PassDIY beginner I think. I was very scared the bias setting of ZV5, but now I am not. 2)Very tight bass, clear mid and high I prefer the sound of F5 than ZV5 with JFET inputs. Now I'm happy with my F5. Thank you for Mr.Pass, Your amplifier stimulated my creation mind.

30th April 2008, 11:30 AM	#517
zeonrider diyAudio Member Join Date: Mar 2004 Location: Belgrade RS	Hi! narinari2106, do you have some pic. of amp.? Regards zeoN_Rider

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30th April 2008, 11:24 AM	#516
Dennis Hui diyAudio Member Join Date: Aug 2002 Location: Toronto, Canada	narinari2106, Congratulations and thank you for sharing with us your impressions. Cheers, Dennis

30th April 2008, 01:36 PM	#519
DaveM diyAudio Member Join Date: Feb 2003 Location: Vermont	Maybe I missed this, but what are people using for jfets? I can't seem to locate a source for the 2SJ108. Will a Fairchild j108 do? Mouser has them. Thanks

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