Samba Pa Ti Posted April 25, 2010 Report Share Posted April 25, 2010 been finishing old projects recently which have been doing my head in for a while, found a treble booster board that i had bought about 6 years ago and never got round to building. this is a box ive had for ages and use it for prototyping now. > http://imgur.com/mlgH7.jpg the innerds > http://imgur.com/MjCU3.jpg finished box (waiting for 2 parts, rubber feet and a battery holder) > http://imgur.com/mL0vs.jpg http://imgur.com/XySyh.jpg http://imgur.com/vD7zB.jpg the switch ontop switches between 2 different transistors an ac128 and a cv7003 (military name of the oc44) i used enamel wire to connect the switch to the transistor socket, the socket made it easy to test all the transistors i had in for the best ones. Quote Link to comment Share on other sites More sharing options...
elmo7sharp9 Posted April 26, 2010 Report Share Posted April 26, 2010 been finishing old projects recently which have been doing my head in for a while, found a treble booster board that i had bought about 6 years ago and never got round to building. These Germanium transistors have probably multiplied in cash value since you bought them. A couple of years ago, I thought I was smart, buying 10 each of AC127 and AC128 from a well-known British bargain-bin mail order business. I thought I'd get, at least, a Fuzz Face and a couple of Rangemasters out of the 20 transistors... But, out of the 20 transistors, only one actually had any electrical properties, the rest were so far out-of-spec as to be useless. I'd have been better off paying premium price for a gain-matched pair. I strongly suspect that these were reject-bin components that my supplier had stored since the late 1960s, in the belief that a market would arise for them sometime. Quote Link to comment Share on other sites More sharing options...
Samba Pa Ti Posted April 26, 2010 Author Report Share Posted April 26, 2010 yeah a lot of mine were duds, either they sound horrible or just have no effect, i actually had 3-4 pairs of ac128's that were "matched" that i got off banzai effects a while back (to make fuzzfaces) and only one of the transistors sounded nice out of that lot, the ones i got off ebay seemed to be nicer.... Quote Link to comment Share on other sites More sharing options...
Paul Marossy Posted April 26, 2010 Report Share Posted April 26, 2010 Cool. I like the way you did the transistor switching. Does it pop when you switch it? Quote Link to comment Share on other sites More sharing options...
Samba Pa Ti Posted April 26, 2010 Author Report Share Posted April 26, 2010 Cool. I like the way you did the transistor switching. Does it pop when you switch it? a little bit, im not sure how to cure it either, its about as bad as the pop when the unit goes on and off, minimal. i stole the idea off a picture i saw somwhere :S <edit> saw this and it gave me the idea to try it http://www.chambonino.com/construct/const12k.jpg from this page http://www.chambonino.com/construct/const12.html triple transistor switching is mentioned there, i dunno how that would be possible without more switches (could have 2 switches with 2 transistors attached and then a switch to select between them). i would like to add a mid boost switch to mine, ive already ordered a few more bits to make another one and use my other transistors up, i think even the nasty sounding ones would sound better if i biased them properly with a trimmer. Quote Link to comment Share on other sites More sharing options...
Paul Marossy Posted April 26, 2010 Report Share Posted April 26, 2010 (edited) I'm not sure that there is a cure for the pop. I was just wondering how big of one it was. Doesn't sound like it's too bad. Edited April 26, 2010 by Paul Marossy Quote Link to comment Share on other sites More sharing options...
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