The Very Best Amplifier I Have Ever Heard!!!! - Page 160 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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
Reply
 
Thread Tools Search this Thread
Old 12th April 2011, 06:30 AM   #1591
diyAudio Member
 
Join Date: Sep 2009
Location: ΑRΤΑ
Default Golmund clone

100KHZ

And after correction

1KHZ- 10KHZ- 100KHZ

Until to be completed and the output stage is a long way to go.
I have little concern about the noise - hum when the amplifier enters the box because it hasn't star ground on ground plane and it will take some cuts on ground plane to properly isolated.
Attached Images
File Type: jpg 11-04-11_1440.jpg (217.4 KB, 983 views)
File Type: jpg 11-04-11_2030.jpg (182.7 KB, 940 views)
File Type: jpg 11-04-11_2031.jpg (181.4 KB, 864 views)
File Type: jpg 11-04-11_2032.jpg (181.2 KB, 819 views)

Last edited by nikosokey; 12th April 2011 at 06:57 AM. Reason: And after correction
  Reply With Quote
Old 12th April 2011, 07:37 AM   #1592
diyAudio Member
 
Join Date: Mar 2008
Looks good. What corrections did you make?
  Reply With Quote
Old 12th April 2011, 07:56 AM   #1593
diyAudio Member
 
Join Date: Sep 2009
Location: ΑRΤΑ
Ηi Tommy
I use C3 and C5 10 pf Cemet.

What a mess i fix it !!!!!
Attached Images
File Type: jpg 11-04-11_2040.jpg (200.6 KB, 848 views)
File Type: jpg 11-04-11_2100.jpg (260.5 KB, 380 views)
File Type: jpg 11-04-11_2101.jpg (246.3 KB, 337 views)

Last edited by nikosokey; 12th April 2011 at 08:03 AM.
  Reply With Quote
Old 12th April 2011, 10:57 PM   #1594
diyAudio Member
 
Join Date: Jan 2011
Quote:
Originally Posted by ashok View Post
This is a very long 'build'!

Any builder care to tell us how this amp sounds in comparison with another amp ?
hi ashok, mostly observing this obession with with this "souped up" Hitachi amp, but that should give you a clue!!! it sounds like a hundred other amps of very similar topology.... just in varying degrees..but for the most part it all in how you set it up topology wise if you want a pretty one but an old HMA 7500 MkI or MkII a little bit of modding the original circuit will give you a pretty good looking "Goldmund" still fascinated by all this respect is due!!!
  Reply With Quote
Old 13th April 2011, 12:25 AM   #1595
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Quote:
Originally Posted by CHARLIEB999 View Post
an old HMA 7500 MkI or MkII, a little bit of modding, the original circuit will give you a pretty good looking "Goldmund"
Bullocks, imo.

Differentiating between a GM and e.g. a Sphinx PJ12 MKI (also monaural, high bandwidth, JFET differential input stage, 3 pairs of J50/K135 Hitachi laterals) will not be that straightforward.
But calling an upgraded Lo-D 7500 a Goldmund means you've never seen or heard the Frenchy amp.
__________________
The buck stops Here
  Reply With Quote
Old 13th April 2011, 12:55 AM   #1596
diyAudio Member
 
Join Date: Jan 2011
Quote:
Originally Posted by jacco vermeulen View Post
Bullocks, imo.

Differentiating between a GM and e.g. a Sphinx PJ12 MKI (also monaural, high bandwidth, JFET differential input stage, 3 pairs of J50/K135 Hitachi laterals) will not be that straightforward.
But calling an upgraded Lo-D 7500 a Goldmund means you've never seen or heard the Frenchy amp.
!!!!! not too sure about that I used to be a high end hi-fi reseller as well as being a very capable audio engineer.
this amp is a "Hitachi" topology amplifier that has been inverted, the additional mod of the fets is not a new thing to me neither is how this circuit behaves did this experiment over 20 yrs ago. as for its relative performance choosing appropriate components for both characteristics and or value and their effect on the subjective audio can be applied to many topologies with similar results the quality of the "sound" can be altered to suit or mimic. a few years back I handled some of the service duties for a distributor of pro-audio products inc Carver, MST rauch, Australian monitor, IRP, Ashly. had much contact with Bob carvers work where his work on "T.F.M." was quite interesting. so heres the rub take one Goldmund amp circuit mess about with it a little to what purpose why not just go and buy one???
I must be really missing something here it is not hard to get "good quality sound" from this "inverted Hitachi" with its new differential pair.

I have managed to gain preference over a "Krell KSA100" with an amp using a "non-inverting Hitachi" circuit with ease using 2N5401's as the input diff pair. so what is all this 1500+ posts on this device coz I am definitely not fully understanding the point of it. a applaud the circuits simplicity always a good point to design a circuit that does not by its own topology create further issues that need yet more stuff incorporated into it to correct them.

choices of different devices that different people use and suggest to others are purely subjective opinions as to their performance with their sources in their own unique environment or must one apply the same stringent rules to this end.

at the end of the days the results of this project are pretty much subjective are they not? please please explain to me someone a concise explanation on this thread and its purpose coz I honestly cannot get it
  Reply With Quote
Old 13th April 2011, 12:59 AM   #1597
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Isn't the price tag enough.
__________________
The buck stops Here
  Reply With Quote
Old 13th April 2011, 01:04 AM   #1598
diyAudio Member
 
Join Date: Jan 2011
Quote:
Originally Posted by jacco vermeulen View Post
Bullocks, imo.

Differentiating between a GM and e.g. a Sphinx PJ12 MKI (also monaural, high bandwidth, JFET differential input stage, 3 pairs of J50/K135 Hitachi laterals) will not be that straightforward.
But calling an upgraded Lo-D 7500 a Goldmund means you've never seen or heard the Frenchy amp.
sorry what is a GM or a sphinx pj12mkI???? whats a LO-D 7500??? think you are trying to tell me this circuit is complex??? coz its not can draw it from memory along with it values even some of the test point potentials and PD's easy to make a "Hitachi HMA 7500" or even a 6500 sound or perform like this "Goldmund" they are so almost the same they could be twins!!!!

BTW I am quite new to forums entirely
  Reply With Quote
Old 13th April 2011, 01:16 AM   #1599
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Lo-D is Hitachi, it's Lo-D first, then Hitachi.
GM is Goldmund.

The Project J12 is a monaural power amp that was manufactured overhere by Sphinx.
1st to come to mind for something that shares many characteristics with the Gioldmund (minus the retail price).
__________________
The buck stops Here
  Reply With Quote
Old 13th April 2011, 01:19 AM   #1600
diyAudio Member
 
Join Date: Jan 2011
Quote:
Originally Posted by jacco vermeulen View Post
Isn't the price tag enough.
price tag??? for what? if you mean an amp to buy, I never buy other peoples amps for personal use. but for business yes no problem used to buy racks full of them to hire.

but if its for my listening pleasure no way 99.999999% are not good enough so make my own for that. perhaps I should do a layout for this device try it but pretty sure it will be the same thing I have done so long ago

so price tag??? if we a talking this goldmund thing most esoteric high end stuff has an inflated price way above any reasonable costing. but then thats what creates its kudos cheap is nasty or no good whereas expensive must be good as well as unavailable to many marketing trick.

actually my son and I were considering manufacturing amps made of glass ( the casing and heatsinking as well) just because people will pay small fortunes for such things check out all the glass loudspeakers there are on the market. are they good?
do they sound "good" one mans good is anothers junk it is purely subjective on the man!!!! so still not getting it. why are you building it? why not design your own or is mimicry the fundamental purpose here?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Has anyone heard of the Pioneer SA-7300 amplifier made back in the 70's? pkgum Solid State 17 14th November 2013 02:24 PM
anyone heard of these? beauistheman Multi-Way 12 22nd September 2008 06:49 AM
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?

All times are GMT. The time now is 06:10 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2