You are here

Tektronix scope 2236 issue with preamplifier, FET wanted

1 post / 0 new
jens_hh
jens_hh picture

Hello to all,
I own a scope 2236, working quite good.
In the past the input chanel 1 was destroyed, Q13= 151-1124-00 was blown. 
This Tek part is very hard to find so I replace it by a BF245b. It was operating, but the frequency range was not linear.
due to the unsuitable characteristic of this N chanel JFET.
Which type will be best as replacement for the original one?
Thanks in advance
Jens
 
Thanks for all hints. Now ich have ordered a J304 from UK, costs nearly 5 € one piece.
I hope the scope will work fine with this JFet on chanel 1 and the built-in meter.
I will report!
Now the J304 arrived. Soldered to the circuit: PERFECT. Some alignment made by comparison chanel B and chanel A. Seems to be OK for me.

IMPORTANT! Choose a forum topic name that is eloquent, as closely as possible to what you are writing about. One possible good name is eg: ORION LCD PT26S chassis 17MB12-2, the power does not start It is not enough to eg "LG LCD TV" or "HP laptop" and the like. The title should not contain uninteresting, irrelevant information either! Incorrectly named topics will be suspended and then deleted after 48 hours! While suspended, others will not be able to post until you correct the address. The incorrect address can be subsequently corrected (within 48 hours) by clicking on the "Edit" tab.