GT703G=AD150=NTE121

ID: 423894
This article refers to the component: To the tube/semiconductor

? GT703G=AD150=NTE121 
21.Sep.17 23:36
90

Omer Suleimanagich (USA)
Articles: 431
Count of Thanks: 5
Omer Suleimanagich

Can a GT703G germanium transistor be used to replace an AD150?

To thank the Author because you find the post helpful or well done.

 2
GT703G=AD150=NTE121 
24.Sep.17 21:10
90 from 1407

Günther Stabe † 19.8.20 (D)
Articles: 398
Count of Thanks: 5
Günther Stabe † 19.8.20

Under some circumstances it may be possible to replace the AD150 with gt703g. The max voltage and consumption are nearly the same, except the max power dissipation (30 W vs. 15 W). In power push pull stages it's necessary to use a pair of equal types and to adjust carefully the quiescent current about 20...30 minutes.


 

To thank the Author because you find the post helpful or well done.

 3
GT703G=AD150=NTE121 
25.Sep.17 05:03
112 from 1407

Omer Suleimanagich (USA)
Articles: 431
Count of Thanks: 6
Omer Suleimanagich

My main question here, is the "transitional frequency" of 10,000 hz of the GT703G and 450 khz of the AD150    Would this create any problems or distortion?

To thank the Author because you find the post helpful or well done.

 4
GT703G=AD150=NTE121 
25.Sep.17 09:21
125 from 1407

Günther Stabe † 19.8.20 (D)
Articles: 398
Count of Thanks: 5
Günther Stabe † 19.8.20

the gt703g can be used for "simple" amplifiers or power switches with a f t of less than 10 kc - and isn't recommended for full audio range amplifications, such as medium / high class hi-fi stereo amplifiers / units. For latter reasons a AD150 or similar type should be used. Some offers I have seen on E*ay these days. Another option may be the SFT213 or 2N1536 instead.


 

To thank the Author because you find the post helpful or well done.

 5
GT703G=AD150=NTE121 
25.Sep.17 09:47
131 from 1407

Omer Suleimanagich (USA)
Articles: 431
Count of Thanks: 5
Omer Suleimanagich

So what you are saying , if I understand correctly, is that the GT703G is

not able to amplify sound frequencies over 10,000 Hz?

To thank the Author because you find the post helpful or well done.

 6
GT703G=AD150=NTE121 
25.Sep.17 10:10
142 from 1407

Günther Stabe † 19.8.20 (D)
Articles: 398
Count of Thanks: 5
Günther Stabe † 19.8.20

You mentioned in post #3 the f t of 10,000 kc - I myself don't have datasheets with this limitation. The f t value says, that an amplification factor of 1 (!) at this frequency will be guaranteed. The less the frequency is, the more amplication will be possible, up to the named values (beta/hfe). If the limit of 50,000 kc of gt703 is true (I don't remember the source...) then this transistor may be used in stereo amplifiers, too.

To thank the Author because you find the post helpful or well done.

 7
GT703G=AD150=NTE121 
25.Sep.17 10:24
144 from 1407

Omer Suleimanagich (USA)
Articles: 431
Count of Thanks: 6
Omer Suleimanagich

Here is the data for the GT703G Type Designator: GT703G Material of Transistor: Ge Polarity: PNP Maximum Collector Power Dissipation (Pc): 15 W Maximum Collector-Emitter Voltage |Vce|: 35 V Maximum Collector Current |Ic max|: 3.5 A Max. Operating Junction Temperature (Tj): 85 °C Transition Frequency (ft): 0.01 MHz Forward Current Transfer Ratio (hFE), MIN: 50 Noise Figure, dB: -

To thank the Author because you find the post helpful or well done.

 8
GT703G=AD150=NTE121 
25.Sep.17 10:48
150 from 1407

Günther Stabe † 19.8.20 (D)
Articles: 398
Count of Thanks: 5
Günther Stabe † 19.8.20

Thank you for this information / confirmation - so my response to post #5 is: YES
 

To thank the Author because you find the post helpful or well done.