Re: First mixer diode on a 7L18 : how to test (and possibly replace) ?
Hi Jose,toggle quoted messageShow quoted text
I recommend that you add "check the attenuator" to your to-do list. Attenuators often act as very expensive fuses.
The mixer diode, whatever it is, will be quite delicate. I've never owned a 7L18, so I have no idea whether the mixer diode is replaceable without special tools. If it is, a possible substitute would be something like a BAT14-104 (a Siemens/Infineon part, IIRC). I've used that diode as a Ka-band mixer, and it works well. They are not cheap though, and easy to damage or kill by casual handling (the capacitance is only around 100-150fF, so when charge transfers from your 100pF body, the voltage can multiply upward by orders of magnitude).
If you get a chance, please take pictures and upload them. I'm very curious to see what the internals look like in that unit.
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford, CA 94305-4070
On 1/14/2021 00:58, Miguel Work wrote:
Wow, a 7l18 I want one!