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Author Topic: Are these AC128s useable?  (Read 3038 times)

LJN

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Are these AC128s useable?
« on: January 05, 2016, 11:03:40 PM »
Hi, everyone. I recently purchased a bunch of AC128 transistors on eBay and I was wondering which fuzz circuits should sound good with them. The hfe on them varies. The lowest is 58 and I believe the highest is 75. The leakage on most of them is 0.06 ma with some having 0.12 ma. I used some in my Tone Bender mk. II clone, but it sounds too smooth. I also used them in a Tone Bender mk. 1.5 with slightly better results. I can't seem to get any of them to work in a fuzzrite circuit, though. I'm wondering if they're useable or if I just wasted my money. Thanks.
If it sounds good, USE IT!

 Epiphone Les Paul, Kasino U100- P, Sears 125-XL

J M Fahey

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Re: Are these AC128s useable?
« Reply #1 on: January 06, 2016, 09:46:42 AM »
What you measure sounds reasonable, they should work.

Please post the fuzzrite schematic .


LJN

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Re: Are these AC128s useable?
« Reply #2 on: January 06, 2016, 05:03:38 PM »
I don't have any way of posting schematics. I tried every one of those transistors and the most I got from it was a very low output with a short, gated, fatty decay.
If it sounds good, USE IT!

 Epiphone Les Paul, Kasino U100- P, Sears 125-XL

J M Fahey

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Re: Are these AC128s useable?
« Reply #3 on: January 07, 2016, 10:13:53 AM »
Well, first you google and open it, copy the link/page address, click the "smiling yellow TV screen"  on the toolbar above and paste the link, then the schematic opens in this page and we can all see and discuss it.

Otherwise it's a guessing game.

LJN

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Re: Are these AC128s useable?
« Reply #4 on: January 07, 2016, 02:39:49 PM »
Okay. I'll see if I can do that.
If it sounds good, USE IT!

 Epiphone Les Paul, Kasino U100- P, Sears 125-XL

LJN

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Re: Are these AC128s useable?
« Reply #5 on: January 07, 2016, 03:17:07 PM »
The schematic is on the mosrite forum. I can't get my phone to post it.
If it sounds good, USE IT!

 Epiphone Les Paul, Kasino U100- P, Sears 125-XL

DrGonz78

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Re: Are these AC128s useable?
« Reply #6 on: January 08, 2016, 12:03:36 AM »
Most of the Mosrite Fuzzrite schematics appear to use NPN type transistors. I did find one I am attaching on the mosriteforum.com website.

Also I am posting the link to Fuzz Central, which shares the ssguitar in the web address. Plenty of Fuzz schematics there...
http://fuzzcentral.ssguitar.com/schematics.php
“A person who never made a mistake never tried anything new.” -Albert Einstein

LJN

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Re: Are these AC128s useable?
« Reply #7 on: January 08, 2016, 01:33:15 AM »
Yes, that's the one. I was wanting to build it because it's the circuit that was used by Iron Butterfly.
If it sounds good, USE IT!

 Epiphone Les Paul, Kasino U100- P, Sears 125-XL

LJN

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Re: Are these AC128s useable?
« Reply #8 on: January 22, 2016, 03:29:04 AM »
Hi, everyone. Well, after some debugging of a few wiring mistakes (not sure how that happened) , I now have a wicked sounding germanium Fuzzrite. It's sporting two of those AC128 transistors. Q1 read as having a hfe of 193 and I believe Q2 is around 60. The only part that's missing is the power filter cap, but the pedal works just fine without it. It nails the "Psychotic Reaction" Tone perfectly!
If it sounds good, USE IT!

 Epiphone Les Paul, Kasino U100- P, Sears 125-XL

LJN

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Re: Are these AC128s useable?
« Reply #9 on: March 03, 2016, 07:36:42 PM »
Would it be possible to make a tremolo circuit with some of these low gain germanium trannies?
If it sounds good, USE IT!

 Epiphone Les Paul, Kasino U100- P, Sears 125-XL

Enzo

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Re: Are these AC128s useable?
« Reply #10 on: March 04, 2016, 04:14:43 AM »
They are just transistors, you can make any transistor circuit you want with them.

LJN

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Re: Are these AC128s useable?
« Reply #11 on: March 04, 2016, 04:44:07 AM »
Be for I try any experimentation with my remaining stock, I'm gonna try to get one of those solderless breadboards. That way I won't go through so much solder. Thanks.
If it sounds good, USE IT!

 Epiphone Les Paul, Kasino U100- P, Sears 125-XL

 

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