when i tried it with a 12ax7 it didn't really sound very good, so i built a fetzer valve instead and it sounds much better. You could try it with a 12au7 and see what it sounds like.
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Messages - dan6896
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thanks for the info, Ive almost finished my prototype just gotta build a power supply and then it should be done. i didn't use an 386 because none of the ones i can find work properly, so i used some car amplifier chip amp kit its about 11.5 watts amp sounds pretty good with just the guitar plugged straight in to it.
Ok, so i built a noisy cricket following the schematic on beavisaudio.com,turned it on and plugged my guitar in it sounded pretty good. but when i turned the volume up and started playing it made this horrible fuzzy sound, same with the gain pot. when i turned the boost switch on it sounded absolutely terrible . its really hard to describe the sound that it makes. Whenever i play a note it makes the same fuzzy farting sound but it is dead quiet when nothing is being played. I have checked the schematic to my layout and it is all connected fine. i have tried many different speakers and it all sounds the same
any ideas on how to fix this.
in advance thanks for the help,
well i was born in guernsey but im in new Zealand now
One day i was looking around the internet for little practice amps with tube preamps. I saw the ruby tubey (but that has too many parts) and i also saw the tube cricket but i could not find a schematic. then i remembered seeing something about a tube boost that runs on 9v called the valve caster.(in case you dont know you can find that here: http://www.diystompboxes.com/smfforum/index.php?topic=63479.0
anyway that gave me an idea for a little practice amp like a ruby or noisy cricket. replace the fet input thing (not sure of the propper name) with a valve caster circuit running into the input of an lm386 power amp. Ill post a schem later
my question to you is do you thing this will work.
in advance thanks for the help.
« on: January 08, 2011, 02:06:13 AM »
i was rummaging around in my garage today any found a 12 v chip amp kit from a few years ago. i'm going to build that now
the kit info: http://www.jaycar.com.au/productView.asp?ID=KJ8076&keywords=amplifier+kit&form=KEYWORD
again thanks for the help everybody.
« on: January 08, 2011, 12:27:57 AM »
thank's for the information spud. that plexitizer looks great but its a bit complicated for a n00b like me maybe one day in the future i will build it. i got lots of other projects going on at the moment.
« on: January 07, 2011, 08:08:23 PM »
actually i think i'm going to build the thundercheif circuit with a few mods because it has less front panel wiring.
thunderchief info: http://www.runoffgroove.com/thunderchief.html
« on: January 06, 2011, 10:24:46 PM »
I'm probably going to get this kit http://www.surplustronics.co.nz/shop/product-FK608.html because it is quite cheap, and build my own power supply from scratch. I think it is the next level up from the one that was suggested. But it might be a while before i can find the time to build this amp. I can't decide between the Thor preamp or the eighteen. When i build it i'll post some pictures and maybe some sound samples.
Thanks for the help everybody
« on: January 06, 2011, 02:39:13 AM »
yeah, that kit looks great but i live in new zealand and they cant ship here, i think. I looked around the local electronics stores and they have quite a few kits with matching power supply's. ill probably get one of them.
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