Hi there,
I picked up a Harman Kardon AVR100 unit from a 'u-fix-it' sale a
year or so ago. Since then I have aquired a factory service
manual(phew!). Long story short, it looks like I'm going to need some
of the final stage amp output devices.(at least) These are apparently
manufactured by Korea Electronics Co.

First question is what does it mean for a transistor to be 'tripple
diffused'?
From the little info I could find, these are desirable for audio/HF
applications. I have listed below some example spec's for one of the
final NPN transistors(a KTC5197).

Second, what BJT characteristics are critical in replacing audio
output devices? Obviously I want to ensure reliability and match the
circuitry correctly, but more importantly, I don't want to 'hear' a
difference. I have a decent electronics background, but havn't messed
with consumer audio equip. much.

I have scoured the net, but have been unable to find a
cross-referenced part. A parametric search at digikey turned up
nothing(lower-spec'd parts).

Lastly, is it necessary to swap all the channels with the same
replacement devices? I'm under the assumtion that I will need matched
pairs for each channel, correct?

Thanks for your time - any input would be greatly appreciated.

Respectfully,
-Jamie

Here are the spec's promised. They can be found in pdf form at:
http://databook.kec.co.kr/Data/PDF/KTC/ENG/KTC5197.pdf

Vcbo/Vceo : 120V
Vebo : 5V
Ic : 10A
Ib : 800mA
Pc : 80W
Tj : 150C
Icbo(Vcb=120V,Ie=0) : 5uA max
Iebo(Veb=5V,Ic=0) :5uA max
V(br)ceo : 120V
hFE(Vce=5V,Ic=1A) : 55min/160max
hFE(Vce=5V,Ic=4A) : 35min/75typ
Vce(sat)(Ic=6A,Ib=0.6A) : 0.35V typ/2.0V max
Vbe(Vce=5V,Ic=4A) : 0.95V typ/1.5V max
fT(transition freq)(Vce=5V,Ic=1A) : 30Mhz typ
Cob(collector ouput capac.)(Vcb=10V,Ie=0,f=1Mhz) : 120pF typ

In article ,
(Slipnfall) wrote:

Hi there,
I picked up a Harman Kardon AVR100 unit from a 'u-fix-it' sale a
year or so ago. Since then I have aquired a factory service
manual(phew!). Long story short, it looks like I'm going to need some
of the final stage amp output devices.(at least) These are apparently
manufactured by Korea Electronics Co.

First question is what does it mean for a transistor to be 'tripple
diffused'?
From the little info I could find, these are desirable for audio/HF
applications. I have listed below some example spec's for one of the
final NPN transistors(a KTC5197).

Second, what BJT characteristics are critical in replacing audio
output devices? Obviously I want to ensure reliability and match the
circuitry correctly, but more importantly, I don't want to 'hear' a
difference. I have a decent electronics background, but havn't messed
with consumer audio equip. much.

I have scoured the net, but have been unable to find a
cross-referenced part. A parametric search at digikey turned up
nothing(lower-spec'd parts).

Lastly, is it necessary to swap all the channels with the same
replacement devices? I'm under the assumtion that I will need matched
pairs for each channel, correct?

Thanks for your time - any input would be greatly appreciated.

Respectfully,
-Jamie

Here are the spec's promised. They can be found in pdf form at:
http://databook.kec.co.kr/Data/PDF/KTC/ENG/KTC5197.pdf

Vcbo/Vceo : 120V
Vebo : 5V
Ic : 10A
Ib : 800mA
Pc : 80W
Tj : 150C
Icbo(Vcb=120V,Ie=0) : 5uA max
Iebo(Veb=5V,Ic=0) :5uA max
V(br)ceo : 120V
hFE(Vce=5V,Ic=1A) : 55min/160max
hFE(Vce=5V,Ic=4A) : 35min/75typ
Vce(sat)(Ic=6A,Ib=0.6A) : 0.35V typ/2.0V max
Vbe(Vce=5V,Ic=4A) : 0.95V typ/1.5V max
fT(transition freq)(Vce=5V,Ic=1A) : 30Mhz typ
Cob(collector ouput capac.)(Vcb=10V,Ie=0,f=1Mhz) : 120pF typ

I don't notice anything special there. Don't get too worked up over the
details. Bipolar power transistors have extremely fat tolerances.

Your only problem is that the case style (half of a TO-3) is uncommon.
In browsing through my ragged old ECG guide, it looks like ECG 36/37
should be a compatible replacement pair. Many options are available if
you can use a real TO-3. Electronics surplus stores might have bins
full of old TO-3P transistors.

You should re-calibrate the bias regardless of what replacement you use.
I'd replace the whole complementary pair since the matching KTA1940 is
likely a little roasted too.

In article ,
(Slipnfall) wrote:

Hi there,
I picked up a Harman Kardon AVR100 unit from a 'u-fix-it' sale a
year or so ago. Since then I have aquired a factory service
manual(phew!). Long story short, it looks like I'm going to need some
of the final stage amp output devices.(at least) These are apparently
manufactured by Korea Electronics Co.

First question is what does it mean for a transistor to be 'tripple
diffused'?
From the little info I could find, these are desirable for audio/HF
applications. I have listed below some example spec's for one of the
final NPN transistors(a KTC5197).

Second, what BJT characteristics are critical in replacing audio
output devices? Obviously I want to ensure reliability and match the
circuitry correctly, but more importantly, I don't want to 'hear' a
difference. I have a decent electronics background, but havn't messed
with consumer audio equip. much.

I have scoured the net, but have been unable to find a
cross-referenced part. A parametric search at digikey turned up
nothing(lower-spec'd parts).

Lastly, is it necessary to swap all the channels with the same
replacement devices? I'm under the assumtion that I will need matched
pairs for each channel, correct?

Thanks for your time - any input would be greatly appreciated.

Respectfully,
-Jamie

Here are the spec's promised. They can be found in pdf form at:
http://databook.kec.co.kr/Data/PDF/KTC/ENG/KTC5197.pdf

Vcbo/Vceo : 120V
Vebo : 5V
Ic : 10A
Ib : 800mA
Pc : 80W
Tj : 150C
Icbo(Vcb=120V,Ie=0) : 5uA max
Iebo(Veb=5V,Ic=0) :5uA max
V(br)ceo : 120V
hFE(Vce=5V,Ic=1A) : 55min/160max
hFE(Vce=5V,Ic=4A) : 35min/75typ
Vce(sat)(Ic=6A,Ib=0.6A) : 0.35V typ/2.0V max
Vbe(Vce=5V,Ic=4A) : 0.95V typ/1.5V max
fT(transition freq)(Vce=5V,Ic=1A) : 30Mhz typ
Cob(collector ouput capac.)(Vcb=10V,Ie=0,f=1Mhz) : 120pF typ

I don't notice anything special there. Don't get too worked up over the
details. Bipolar power transistors have extremely fat tolerances.

Your only problem is that the case style (half of a TO-3) is uncommon.
In browsing through my ragged old ECG guide, it looks like ECG 36/37
should be a compatible replacement pair. Many options are available if
you can use a real TO-3. Electronics surplus stores might have bins
full of old TO-3P transistors.

You should re-calibrate the bias regardless of what replacement you use.
I'd replace the whole complementary pair since the matching KTA1940 is
likely a little roasted too.

In article ,
(Slipnfall) wrote:

Hi there,
I picked up a Harman Kardon AVR100 unit from a 'u-fix-it' sale a
year or so ago. Since then I have aquired a factory service
manual(phew!). Long story short, it looks like I'm going to need some
of the final stage amp output devices.(at least) These are apparently
manufactured by Korea Electronics Co.

First question is what does it mean for a transistor to be 'tripple
diffused'?
From the little info I could find, these are desirable for audio/HF
applications. I have listed below some example spec's for one of the
final NPN transistors(a KTC5197).

Second, what BJT characteristics are critical in replacing audio
output devices? Obviously I want to ensure reliability and match the
circuitry correctly, but more importantly, I don't want to 'hear' a
difference. I have a decent electronics background, but havn't messed
with consumer audio equip. much.

I have scoured the net, but have been unable to find a
cross-referenced part. A parametric search at digikey turned up
nothing(lower-spec'd parts).

Lastly, is it necessary to swap all the channels with the same
replacement devices? I'm under the assumtion that I will need matched
pairs for each channel, correct?

Thanks for your time - any input would be greatly appreciated.

Respectfully,
-Jamie

Here are the spec's promised. They can be found in pdf form at:
http://databook.kec.co.kr/Data/PDF/KTC/ENG/KTC5197.pdf

Vcbo/Vceo : 120V
Vebo : 5V
Ic : 10A
Ib : 800mA
Pc : 80W
Tj : 150C
Icbo(Vcb=120V,Ie=0) : 5uA max
Iebo(Veb=5V,Ic=0) :5uA max
V(br)ceo : 120V
hFE(Vce=5V,Ic=1A) : 55min/160max
hFE(Vce=5V,Ic=4A) : 35min/75typ
Vce(sat)(Ic=6A,Ib=0.6A) : 0.35V typ/2.0V max
Vbe(Vce=5V,Ic=4A) : 0.95V typ/1.5V max
fT(transition freq)(Vce=5V,Ic=1A) : 30Mhz typ
Cob(collector ouput capac.)(Vcb=10V,Ie=0,f=1Mhz) : 120pF typ

I don't notice anything special there. Don't get too worked up over the
details. Bipolar power transistors have extremely fat tolerances.

Your only problem is that the case style (half of a TO-3) is uncommon.
In browsing through my ragged old ECG guide, it looks like ECG 36/37
should be a compatible replacement pair. Many options are available if
you can use a real TO-3. Electronics surplus stores might have bins
full of old TO-3P transistors.

You should re-calibrate the bias regardless of what replacement you use.
I'd replace the whole complementary pair since the matching KTA1940 is
likely a little roasted too.

In article ,
(Slipnfall) wrote:

Hi there,
I picked up a Harman Kardon AVR100 unit from a 'u-fix-it' sale a
year or so ago. Since then I have aquired a factory service
manual(phew!). Long story short, it looks like I'm going to need some
of the final stage amp output devices.(at least) These are apparently
manufactured by Korea Electronics Co.

First question is what does it mean for a transistor to be 'tripple
diffused'?
From the little info I could find, these are desirable for audio/HF
applications. I have listed below some example spec's for one of the
final NPN transistors(a KTC5197).

Second, what BJT characteristics are critical in replacing audio
output devices? Obviously I want to ensure reliability and match the
circuitry correctly, but more importantly, I don't want to 'hear' a
difference. I have a decent electronics background, but havn't messed
with consumer audio equip. much.

I have scoured the net, but have been unable to find a
cross-referenced part. A parametric search at digikey turned up
nothing(lower-spec'd parts).

Lastly, is it necessary to swap all the channels with the same
replacement devices? I'm under the assumtion that I will need matched
pairs for each channel, correct?

Thanks for your time - any input would be greatly appreciated.

Respectfully,
-Jamie

Here are the spec's promised. They can be found in pdf form at:
http://databook.kec.co.kr/Data/PDF/KTC/ENG/KTC5197.pdf

Vcbo/Vceo : 120V
Vebo : 5V
Ic : 10A
Ib : 800mA
Pc : 80W
Tj : 150C
Icbo(Vcb=120V,Ie=0) : 5uA max
Iebo(Veb=5V,Ic=0) :5uA max
V(br)ceo : 120V
hFE(Vce=5V,Ic=1A) : 55min/160max
hFE(Vce=5V,Ic=4A) : 35min/75typ
Vce(sat)(Ic=6A,Ib=0.6A) : 0.35V typ/2.0V max
Vbe(Vce=5V,Ic=4A) : 0.95V typ/1.5V max
fT(transition freq)(Vce=5V,Ic=1A) : 30Mhz typ
Cob(collector ouput capac.)(Vcb=10V,Ie=0,f=1Mhz) : 120pF typ

I don't notice anything special there. Don't get too worked up over the
details. Bipolar power transistors have extremely fat tolerances.

Your only problem is that the case style (half of a TO-3) is uncommon.
In browsing through my ragged old ECG guide, it looks like ECG 36/37
should be a compatible replacement pair. Many options are available if
you can use a real TO-3. Electronics surplus stores might have bins
full of old TO-3P transistors.

You should re-calibrate the bias regardless of what replacement you use.
I'd replace the whole complementary pair since the matching KTA1940 is
likely a little roasted too.

In article ,
(Slipnfall) wrote:

Hi there,
I picked up a Harman Kardon AVR100 unit from a 'u-fix-it' sale a
year or so ago. Since then I have aquired a factory service
manual(phew!). Long story short, it looks like I'm going to need some
of the final stage amp output devices.(at least) These are apparently
manufactured by Korea Electronics Co.

First question is what does it mean for a transistor to be 'tripple
diffused'?
From the little info I could find, these are desirable for audio/HF
applications. I have listed below some example spec's for one of the
final NPN transistors(a KTC5197).

Second, what BJT characteristics are critical in replacing audio
output devices? Obviously I want to ensure reliability and match the
circuitry correctly, but more importantly, I don't want to 'hear' a
difference. I have a decent electronics background, but havn't messed
with consumer audio equip. much.

I have scoured the net, but have been unable to find a
cross-referenced part. A parametric search at digikey turned up
nothing(lower-spec'd parts).

Lastly, is it necessary to swap all the channels with the same
replacement devices? I'm under the assumtion that I will need matched
pairs for each channel, correct?

Thanks for your time - any input would be greatly appreciated.

Respectfully,
-Jamie

Here are the spec's promised. They can be found in pdf form at:
http://databook.kec.co.kr/Data/PDF/KTC/ENG/KTC5197.pdf

Vcbo/Vceo : 120V
Vebo : 5V
Ic : 10A
Ib : 800mA
Pc : 80W
Tj : 150C
Icbo(Vcb=120V,Ie=0) : 5uA max
Iebo(Veb=5V,Ic=0) :5uA max
V(br)ceo : 120V
hFE(Vce=5V,Ic=1A) : 55min/160max
hFE(Vce=5V,Ic=4A) : 35min/75typ
Vce(sat)(Ic=6A,Ib=0.6A) : 0.35V typ/2.0V max
Vbe(Vce=5V,Ic=4A) : 0.95V typ/1.5V max
fT(transition freq)(Vce=5V,Ic=1A) : 30Mhz typ
Cob(collector ouput capac.)(Vcb=10V,Ie=0,f=1Mhz) : 120pF typ

I don't notice anything special there. Don't get too worked up over the
details. Bipolar power transistors have extremely fat tolerances.

Your only problem is that the case style (half of a TO-3) is uncommon.
In browsing through my ragged old ECG guide, it looks like ECG 36/37
should be a compatible replacement pair. Many options are available if
you can use a real TO-3. Electronics surplus stores might have bins
full of old TO-3P transistors.

You should re-calibrate the bias regardless of what replacement you use.
I'd replace the whole complementary pair since the matching KTA1940 is
likely a little roasted too.