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Old 10th March 2007, 04:43 AM   #31
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powerbecker what is this module used for ????

is it in your lounge room hifi setup ?? or an ac motor controller???

-Dan
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Old 10th March 2007, 05:53 AM   #32
Zoran is offline Zoran  Serbia
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I have been built
an Elector IGBT amp
by Giesberts...
That one from the first page SCH
while ago (1998?)
that was two mono blocks in same chasis...
I must say that was amp to remeber
realy...
etremly fast sound
excelent dumping factor
and operation i class A to about 2.5W
with 400mA cuescient current
the amp shows no Sandy sound against MOSFET amps
sound sometimes could be compared with germanium amps...
IGBT devices was not coupled
but all other BC550C/BC560C was...
I remember that I get better values then at the specimen measured,
build by Elector
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Old 10th March 2007, 02:54 PM   #33
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Quote:
Originally posted by danieljw
powerbecker what is this module used for ????

is it in your lounge room hifi setup ?? or an ac motor controller???

-Dan

Dan,
itīs for my piezo hearing aid

No, itīs for test and research, for a motor controller one donīt need 150kHz bandwidth.

Heinz!
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Old 10th March 2007, 05:48 PM   #34
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piezo hearing aid i like it!!!!
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Old 11th May 2007, 07:37 AM   #35
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Quote:
Originally posted by Eva

However, there is really little stuff for "KW" amplifiers.
Evita, "There is a huge stuff for KW level amplifiers if built using
All N-channel Output Stage"
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Old 25th May 2007, 01:16 PM   #36
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Default IGBT

Threshold made 2 series of amplifiers using IGBTs, the T series and Forte.

Personally, I think they are still some of the best sounding amps out there and that IGBTs are one of the best sounding output devices. I will be comparing my Threshold T400 to a X150 shortly. The T400 is ready for a recap-90000+ hours, so it may not be a fair comparison but speaks volumes as to their reliability in a power amp application.

Class A operation is not a problem with N channel only devices. I'm not sure there are currently any suitable devices in production as most of the newer parts have an integrated snubber diode for motor controller applications which again speaks to reliability.
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Old 17th September 2007, 06:46 PM   #37
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Default I Believe My Ears... Forget Theory

Sorry to revive an old thread...

I own several old Forte Model 4's and I can say with no reservations that they continue to compete with today's best offerings. The ONLY caveat I would add is that they're a bit week in the lowest octaves. However, they're very clean and detailed from midbass through the highest octaves. They are finely detailed without a HINT of harshness. I'm told that the updates available from V.A.R. further enhance these little amps' performance, particularly in the bottom end.

Regarding bass weakness: I use larger amps for my subs and reserve the sweet Class A 50 WPC for the frequency range in which these babies excell.

I believe my ears rather than formulae or theory. I frankly don't care what output devices they use. My ears are the most important/trusted measuring devices I could ever own.
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Old 14th January 2008, 01:07 PM   #38
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Just made this amp out of scraped parts lying here & there for a friend of mine........It uses 5 Pairs of APT100GF60LR IGBT to get 1.6KW in Class-AB. The topology is All N-channel with Grounded Output .......
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Old 14th January 2008, 06:20 PM   #39
latala is offline latala  United Kingdom
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Work horse .What is the schematic like I would love to see it !
the photo of your amp looks good,very good
regards Trev
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Old 15th January 2008, 04:49 AM   #40
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Schematic
Frontend powered by +/-18V regulated, all small signal Transistors BC546/56 pairs and Drivers are MJE350.......
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