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JMK TESTER/ GT308’s/GE Diodes

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lego4040

Post subject: JMK TESTER/ GT308’s/GE Diodes

Posted: Fri Mar 29, 2024 6:39 pm

Joined: Mon Feb 06, 2012 7:16 pm
Posts: 1509
Location: NYC

So some of my projects may go to my Son to build. He’s a Junior studying Star Trek Math and electrical science. He was To build for his lab class project with science to back it so I’m putting things together. I have a Pasty face with a stash of GT 308’s to sort through for him and one for me. I have Germanium Diodes on the way for maybe a Klon and another OD-855. This is what I have coming:

D9B - According to the Atlas Peak it is the closest to 1N34A.
D9D - another alternative for 1N34A with slightly longer curve
D2E - Somehow more aggressive than the D9E.
D9E - many say this is the best option for a KLON.
D9K - slightly longer curve than the above, somewhere between a 1N34A and a 1N270.
D9L - medium curve, somewhere between a 1N34A and a 1N270
And ID507A’s
Using salvaged parts from my PowerPlant I started the enclosure for my JMK tester, enclosure from HighPressure module, brass block from zone valve, this covers knockout and nicely holds clips.

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TNblueshawk

Post subject: Re: JMK TESTER/ GT308’s/GE Diodes

Posted: Sat Mar 30, 2024 7:35 am

Joined: Tue Feb 07, 2012 3:18 pm
Posts: 7352
Location: Nashville, TN

Very cool Lionel

What is Star Trek math? I can't get past the base 10 system :lol:

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powerpopguy wrote:

warm places theory sounds plausible. Occasionally, I wake up and think my snake is missing too, but it turns out it's just a chilly morning.

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duhvoodooman

Post subject: Re: JMK TESTER/ GT308’s/GE Diodes

Posted: Sat Mar 30, 2024 9:55 am

Moderator

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 16227
Location: Albany, NY

Cool project!

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“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

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lego4040

Post subject: Re: JMK TESTER/ GT308’s/GE Diodes

Posted: Sat Mar 30, 2024 10:18 am

Joined: Mon Feb 06, 2012 7:16 pm
Posts: 1509
Location: NYC

TNblueshawk wrote:

Very cool Lionel

What is Star Trek math? I can't get past the base 10 system :lol:

advanced Quantum Physics, string theory, etc. a single mathematical question is pages long and looks like ancient Star Gate drawings. Me, I didn’t get past algebra 1.

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TNblueshawk

Post subject: Re: JMK TESTER/ GT308’s/GE Diodes

Posted: Sun Mar 31, 2024 7:05 am

Joined: Tue Feb 07, 2012 3:18 pm
Posts: 7352
Location: Nashville, TN

lego4040 wrote:

TNblueshawk wrote:

Very cool Lionel

What is Star Trek math? I can't get past the base 10 system :lol:

advanced Quantum Physics, string theory, etc. a single mathematical question is pages long and looks like ancient Star Gate drawings. Me, I didn’t get past algebra 1.

_________________

powerpopguy wrote:

warm places theory sounds plausible. Occasionally, I wake up and think my snake is missing too, but it turns out it's just a chilly morning.

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lego4040

Post subject: Re: JMK TESTER/ GT308’s/GE Diodes

Posted: Wed Apr 03, 2024 5:34 pm

Joined: Mon Feb 06, 2012 7:16 pm
Posts: 1509
Location: NYC

Two pasty faces on the bench, don’t know when I’ll get to them for myself but I’ll put a kit together for my Son. I don’t remember how or specs on trannies I used (hfe amount of each and order I did.) I’ll dig around papers

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lego4040

Post subject: Re: JMK TESTER/ GT308’s/GE Diodes

Posted: Mon Apr 15, 2024 10:17 am

Joined: Mon Feb 06, 2012 7:16 pm
Posts: 1509
Location: NYC

So I went through all those 308’s and although they had very small amount of leakage, all the gains were mid 30’s to 60 :cry:

I went though my OC 83’s and I have enough for two or three Fuzz’s. I don’t know what I can use those GT 308’s for, damn. I put a pair in Darlington and got 400hfe on one pair :shock:

maybe play around and build a crazy fuzz

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