The Very Best Amplifier I Have Ever Heard!!!! - Page 203

bigpanda · 2nd June 2012, 12:35 AM

Any suggestion for a Vbe please?

For R20, I intend to use a 5K-1/2w pot in parallel with a 330R-3W, a 3W pot would be something that is difficult to find. Will that work ? I have implemented that in the new pcb too.

bigpanda · 24th June 2012, 10:52 PM

Hi,

Maybe I did not phrase this right : if we are to use IRFP240/9240, how do we alter the circuit to do so? Thank you.

BP

nikosokey · 25th June 2012, 06:51 AM

I think this amp does not need any change. It has produced great results for clones if they faithfully follow some specific things.

alex mm · 25th June 2012, 08:19 AM

Quote:

Originally Posted by nikosokey

I think this amp does not need any change. It has produced great results for clones if they faithfully follow some specific things.

......I'm totaly agree ,no need to change component in schematic .

Alex.

bigpanda · 25th June 2012, 08:27 AM

Hi nikosokey,

I am not saying I am trying to make it better. Just to make it more flexible. The IRFP are easier to get than the 2sk's and it is always nice to have an alternative, right? Even it is only 90% as good, it is still worth to try out, Don't you think so?

regards
BP

Jay · 08:43 AM

Bigpanda, I think Niko and Alex are referring to the extra cascode in the VAS LTP
If you want to improve the schematic, you can try better device such as the FZT parts for the VAS.

Nico Ras · 09:21 AM

Quote:

Originally Posted by bigpanda

Hi nikosokey,

I am not saying I am trying to make it better. Just to make it more flexible. The IRFP are easier to get than the 2sk's and it is always nice to have an alternative, right? Even it is only 90% as good, it is still worth to try out, Don't you think so?

regards
BP

You cannot interchange Lateral Mosfet and Hexfet without some modifications to the circuit. You will end up with thermal runaway. Besides changing would make it a different schematic requiring a totally different board.

quanghao · 25th June 2012, 09:31 AM

Quote:

Originally Posted by Jay

Bigpanda, I think Niko and Alex are referring to the extra cascode in the VAS LTP
If you want to improve the schematic, you can try better device such as the FZT parts for the VAS.

i think you can change some the value, it is the better the sound!

Use FZT 857 and 957
thanks

nikosokey · 09:46 AM

Quote:

Originally Posted by quanghao

i think you can change some the value, it is the better the sound!

Use FZT 857 and 957
thanks

Αt this point agree due to temperature that grow on the transistors Mpsa 93-43.
If this sounds better (FZT 857 and 957) do not know.

quanghao · 09:49 AM

Quote:

Originally Posted by nikosokey

Αt this point agree due to temperature that grow on the transistors Mpsa 93-43.
If this sounds better (FZT 857 and 957) do not know.

yes! but change some value for low current, and change bias to biger

150R to 220R

25th June 2012, 08:39 AM	#2026
Jay diyAudio Member Join Date: Feb 2003 Location: Jakarta	Bigpanda, I think Niko and Alex are referring to the extra cascode in the VAS LTP If you want to improve the schematic, you can try better device such as the FZT parts for the VAS. Last edited by Jay; 25th June 2012 at 08:43 AM.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
anyone heard of these?	beauistheman	Multi-Way	12	22nd September 2008 06:49 AM
Has anyone heard of the Pioneer SA-7300 amplifier made back in the 70's?	pkgum	Solid State	8	11th April 2008 01:54 PM
ANA Audio Research APA 8 Power Amplifier. Heard of it?	Junior	Solid State	0	1st August 2007 12:56 AM
Anyone ever heard of	Staticjeep	Music	0	9th March 2006 02:15 AM
Anyone heard of Jam-Tech True Fidelity Amplifier?	tschanrm	Class D	1	17th November 2005 01:10 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

2nd June 2012, 12:35 AM	#2021
bigpanda diyAudio Member Join Date: Jun 2004 Location: HKSAR	Any suggestion for a Vbe please? For R20, I intend to use a 5K-1/2w pot in parallel with a 330R-3W, a 3W pot would be something that is difficult to find. Will that work ? I have implemented that in the new pcb too.

24th June 2012, 10:52 PM	#2022
bigpanda diyAudio Member Join Date: Jun 2004 Location: HKSAR	Hi, Maybe I did not phrase this right : if we are to use IRFP240/9240, how do we alter the circuit to do so? Thank you. BP

25th June 2012, 06:51 AM	#2023
nikosokey diyAudio Member Join Date: Sep 2009 Location: ΑΡΤΑ	I think this amp does not need any change. It has produced great results for clones if they faithfully follow some specific things.

25th June 2012, 08:27 AM	#2025
bigpanda diyAudio Member Join Date: Jun 2004 Location: HKSAR	Hi nikosokey, I am not saying I am trying to make it better. Just to make it more flexible. The IRFP are easier to get than the 2sk's and it is always nice to have an alternative, right? Even it is only 90% as good, it is still worth to try out, Don't you think so? regards BP