The Very Best Amplifier I Have Ever Heard!!!! - Page 218 - 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 14th February 2013, 09:06 PM   #2171
diyAudio Member
 
Join Date: Mar 2008
Quote:
Originally Posted by TANDBERGEREN View Post
In addition there is four capacitors on each PCB too? Yes
What are the value on them? 1000uF each.
  Reply With Quote
Old 14th February 2013, 09:20 PM   #2172
diyAudio Member
 
Join Date: Jan 2011
Location: Fosser, Aurskog-Holand, Akershus, Norway.
Eight powertransformers supply all the "gadgets" and softstart and so on in this one.
1000VA X 2 transformers for the output transistors and probably a total of 16000uF on each channel. Nice.
__________________
Sooner or later you end up with TANDBERG
  Reply With Quote
Old 14th February 2013, 09:22 PM   #2173
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 TANDBERGEREN View Post
Wonder if this peak swing of 28Amps is continuous or not ?
- Maximum current swing : 28 A peak.
The datasheets of the 125W devices both state that Max drain current (Id) is 8A.
3 Lateral Mosfets in parallel : 3 x 8 = 24A
That is maximum continuous output current.

Please don't believe me, and read what the Id/Vds graph says above the 8A line after the word : Idmax.

That makes the 28A ?

(for those interested :
Max continuous current of a Lateral Mosfet is due to the formation of so-called hot-spots.
Basically, when the channel of a Lateral heats up, the hot-spots raise the channel resistance, by which the current is limited.
Pretty much the same principle by which Lateral Mosfets self-protect : during a short, the channel turns high-Ohmic, cool it down and the channel opens up again. Think thermo-static valve.
Current peaks do not last long enough to heat up the die, so peak drain current can be much higher than the 8A continuous for the 125W, or the 7A for the 100W devices.
Monaural power amps I built with 4-pair J50/K135 output stages easily managed a multitude of the 7A per device during short peak bursts. Something the datasheet doesn't tell you, btw.)
__________________
The buck stops Here

Last edited by jacco vermeulen; 14th February 2013 at 09:31 PM.
  Reply With Quote
Old 14th February 2013, 09:43 PM   #2174
diyAudio Member
 
Join Date: Jan 2011
Location: Fosser, Aurskog-Holand, Akershus, Norway.
Quote:
Originally Posted by jacco vermeulen View Post
The datasheets of the 125W devices both state that Max drain current (Id) is 8A.
3 Lateral Mosfets in parallel : 3 x 8 = 24A
That is maximum continuous output current.

Please don't believe me, and read what the Id/Vds graph says above the 8A line after the word : Idmax.

That makes the 28A ?

(for those interested :
Max continuous current of a Lateral Mosfet is due to the formation of so-called hot-spots.
Basically, when the channel of a Lateral heats up, the hot-spots raise the channel resistance, by which the current is limited.
Pretty much the same principle by which Lateral Mosfets self-protect : during a short, the channel turns high-Ohmic, cool it down and the channel opens up again. Think thermo-static valve.
Current peaks do not last long enough to heat up the die, so peak drain current can be much higher than the 8A continuous for the 125W, or the 7A for the 100W devices.
Monaural power amps I built with 4-pair J50/K135 output stages easily managed a multitude of the 7A per device during short peak bursts. Something the datasheet doesn't tell you, btw.)

I actually quoted the GOLDMUND own datasheet for the amplifier.

Go figure what THEY tell us. FYI: http://www.google.no/url?sa=t&rct=j&...42452523,d.bGE

Tell me, WHAT is Your issue? No confidence at all?
__________________
Sooner or later you end up with TANDBERG
  Reply With Quote
Old 14th February 2013, 10:03 PM   #2175
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
.
Attached Images
File Type: jpg MM29-4.jpg (39.0 KB, 403 views)
__________________
The buck stops Here
  Reply With Quote
Old 14th February 2013, 10:09 PM   #2176
diyAudio Member
 
Join Date: Jan 2011
Location: Fosser, Aurskog-Holand, Akershus, Norway.
With two 1000VA transformers on board?
The link I added tells 2000W. Strange.

Page 14. Fused: 10Amps. (consistent)

BUT, there seems to be different versions where they use 110V. Theese are only fused 16A, consistent with a lower total power.
__________________
Sooner or later you end up with TANDBERG

Last edited by TANDBERGEREN; 14th February 2013 at 10:13 PM.
  Reply With Quote
Old 14th February 2013, 10:15 PM   #2177
diyAudio Member
 
Join Date: Jan 2011
Location: Fosser, Aurskog-Holand, Akershus, Norway.
12
SPEED
- Slew rate : > 200 V/us
- Rise time : < 300 ns.
CROSSTALK
- Separation : > 100 dB between channels. Isolated ground.
NOISE
- Signal-to noise ratio : > 115 dB (0.01 Hz - 1 Mhz).
- Weighted ASA A : > 130 dB.
OPERATING TEMPERATURE
- Room temperature : -30 to +40 degrees Celsius
(-22 to +104 degrees Fahrenheit).
- Internal temperature : +45 to +65 degrees Celsius
(+113 to +149 degrees Fahrenheit).
POWER SUPPLY
- Nominal line voltage : 117, 234 V (switchable).
- Input voltage range : +/- 10 %.
- Maximum power consumption : 2000 W.
- Power used in standby : 120 W.
- 8 toroidal transformers, 8 separated power supply.
GROUNDING
- Separated ground for each channel.
- Floating chassis connected to mains earth.
- Switch for optionally connecting both.
SAFETY FEATURES
- AC voltage fuse : min 10 A slow-blow for 220 V / 16 A slow-blow for 110 V.

User Manual – Goldmund Mimesis 22M Power Amplifier 12

(Page 14 of the PDF-document equals GOLDMUndS Page 12 in the user manual.)
__________________
Sooner or later you end up with TANDBERG
  Reply With Quote
Old 14th February 2013, 10:28 PM   #2178
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
There's not much sense in comparing the MM9/9.2 with the MM29.
(and I have no idea what's inside the Mimesis 29M )

The Mimesis 29 uses TO3P devices in the output stage, 6 pairs of J162/K1058.
(Mimesis 28 has 4 pairs per channel of those)

For those who missed the very unusual way the heatsink is attached to the case of the Mimesis power amp (MM29 in this example)=>
Attached Images
File Type: jpg MM29-3.jpg (53.8 KB, 397 views)
__________________
The buck stops Here

Last edited by jacco vermeulen; 14th February 2013 at 10:30 PM.
  Reply With Quote
Old 15th February 2013, 08:03 AM   #2179
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
Hitachi s laterals are extremely rugged components that could
stand extreme abuses that would be lethal for BJTs with supposedely
higher power ratings.

I used 3 pairs of TO3 devices with a 2X48V AC transformer , wich put
the power output to about 125W/8R with a stereo build , yet even
using a 4R load at full volume for hours in an overheated stage and
without any active cooling didnt seems to bother thoses devices
during the 20 years or so of such harsh condition , the amp is still
working and kicking.

From this extensive real world and long term testing i came to the conclusion
that those devices can handle a power output that is 70% of their TDP ratings,
that is , a pair of 100W TDP devices is enough for 70W RMS output , so using
three 125W TO3 pairs should be adequate for up to 260W RMS , short of the
Tanbergeren targeted 350W wich would require four pairs if reliability is a concern.

As for the Goldmund itself , well , i explained in another thread that it s really
not my cup of tea given that i found through simulations that excepted slew rate
it is a relatively low performing amp , good enough for vinyl , tuner or K7 sources
but well below the CD format quality requirements.
  Reply With Quote
Old 15th February 2013, 08:37 AM   #2180
catalin is offline catalin  Romania
diyAudio Member
 
Join Date: Jun 2007
Quote:
Originally Posted by wahab View Post
As for the Goldmund itself , well , i explained in another thread that it s really
not my cup of tea given that i found through simulations that excepted slew rate
it is a relatively low performing amp , good enough for vinyl , tuner or K7 sources
but well below the CD format quality requirements.
Hello Wahab,you can say from simulations if an amp performs low in therms of sound ?
Can the simulations assure us that an amp has great sound ?

As I understand the thd&imd for goldmund are decent to good ~0.01 .
But may be the thd are not a factor important to say that an amp has good sound .
So what parameters do you simulate ?
__________________
"please try to listen to some music through the amplifier instead. Life is so short ..."
  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 03:42 PM.


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