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ID = 60848
Soviet Union
Brand: Common type USSR (SU) tube/semicond.
Tube type:  Transistor   Power/Output 
Identical to ГТ703

Base Wires
Filament Solid State

PNP germanium alloy transistor intended as AF power amplifier / switch.

Text in other languages (may differ)
Weight 5 g / 0.18 oz
Information source -- Collector info (Sammler)   Towers ITVL
  ГТ703: (schematic)
Günther Stabe
ГТ703: Ebay: www_xsistema_lt
Günther Stabe

ГТ703: Towers ITVL
Günther Stabe


Usage in Models 1= 1978

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

Forum contributions about this tube
Threads: 1 | Posts: 8
Hits: 734     Replies: 7
Omer Suleimanagich

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

Günther Stabe

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.


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?

Günther Stabe

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.


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?

Günther Stabe

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.

Omer Suleimanagich
  7 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: -
Günther Stabe

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

End of forum contributions about this tube

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