Help needed with DIY Darlington pair

[offsetgamematch]

Hi I'm hoping for some help with a diy Darlington pair - it's my first time trying this out. I've got some low gain (50hfe or so) npn Russian germanium transistors I'm trying to pair up. However when I've connected two in the format (collectors tied together, emitter from q1 to base from q2) im getting an hfe of 14, when im expecting 2500 or so.

Leakage (ICEO) is 35ua which I believe is acceptable. What am I doing wrong?

[antonis]

Hi & Welcome..

2500 h_FE for 50 X 50 is more than ideal due to particular BJT h_FE variation according to Collector current..

http://diy.smallbearelec.com/HowTos/BreadboardGeDarlingtonFFs/BreadboardGeDarlingtonFFs.htm

P.S.1
Could you plz post a schematic of the circuit where Darlington pair is utilized..??
(with items and power supply values..)

P.S.2
In case of h_FE of 14 was taken via a transistor h_FE meter, don't trust it cause those meters aren't able to calculate high current gains and don't take into account the almost double V_BE..

[offsetgamematch]

Hi - thanks for the response. I've literally just soldered the respective legs together and placed them in a component tester. The plan was to later use them in a muff circuit.

[antonis]

I don't think that component tester is able to accurate measure Darlington pair obtained h_FE..

Also, actuall h_FE is far away (lower) than ideal one..

A brief info in paragraph 1. Basic configurations
https://sound-au.com/articles/cmpd-vs-darl.htm