tag:blogger.com,1999:blog-6847048658257278783.post1150840310437162159..comments2024-03-28T18:53:30.726+00:00Comments on Guitar FX Layouts: Ampeg A3 OverdriveIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger16125tag:blogger.com,1999:blog-6847048658257278783.post-33396185490828300622016-05-28T17:30:05.184+01:002016-05-28T17:30:05.184+01:00Built this using John Kallas's mods from his p...Built this using John Kallas's mods from his photo plus changing that 10k to 47k. Nice overdrive!Hozy31https://www.blogger.com/profile/16714771534041521767noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-82445702350501694612013-11-08T16:31:33.773+00:002013-11-08T16:31:33.773+00:00Fixed.
+mFixed.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-2181080764700684342013-11-08T08:33:35.941+00:002013-11-08T08:33:35.941+00:00Ah. True. I'll fix it in the evening.
Thanks J...Ah. True. I'll fix it in the evening.<br />Thanks John.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-38381274826989798272013-11-08T08:24:35.721+00:002013-11-08T08:24:35.721+00:00BTW, I did find one error. D3 is supposed to conne...BTW, I did find one error. D3 is supposed to connect one row down (to pin 2) otherwise the pair, D2 & D3 does nothing..johnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-36472552638409601202013-11-08T07:36:24.749+00:002013-11-08T07:36:24.749+00:00after a couple of mods, I finally got mine boxed u...after a couple of mods, I finally got mine boxed up. pics below:<br /><br />http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/AmpegA3/A3-01.jpg<br /><br />http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/AmpegA3/A3-02.jpgjohnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-21941621418777428992013-11-01T17:18:29.104+00:002013-11-01T17:18:29.104+00:00not really, but it does have a lot of low end.not really, but it does have a lot of low end.johnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-56136439665266710332013-11-01T17:17:43.363+00:002013-11-01T17:17:43.363+00:00This comment has been removed by the author.johnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-61112164999500771772013-11-01T12:07:33.889+00:002013-11-01T12:07:33.889+00:00Is this an overdrive specificly for the bass?
Is this an overdrive specificly for the bass?<br />Seg@fredohttps://www.blogger.com/profile/17829974182999631886noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-86063889316635901632013-10-31T06:02:24.096+00:002013-10-31T06:02:24.096+00:00Cheers John. I'll update the labels and tag it...Cheers John. I'll update the labels and tag it when i'm back home from work.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-69443035051542261362013-10-30T22:51:08.591+00:002013-10-30T22:51:08.591+00:00I built this one this morning. if you reverse lugs...I built this one this morning. if you reverse lugs 1 & 3 on the tone pot, you can VERIFY IT. this one has a TON of distortion on tap, but with the overdrive cranked, IMO, the dirt is a bit 'messy' sounding( so i'm going to work on that). with the gain/overdrive control set at minimum, with the volume dimed, it's below unity gain, so it doesn't have all that much output at lower overdrive settings. I remedied that on mine by replacing the 10K that goes from pins 6 & 7 on the opamp with a 47K one. now it has a lot of output.johnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-57830232720206791612013-10-27T20:12:48.585+00:002013-10-27T20:12:48.585+00:00okay. got it.okay. got it.johnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-68167798155077158072013-10-27T13:14:55.287+00:002013-10-27T13:14:55.287+00:00Yes it does. It acts as virtual ground and there&#...Yes it does. It acts as virtual ground and there's a buffer after the volume control, so that is ok.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-38449123661421379392013-10-27T08:41:40.531+00:002013-10-27T08:41:40.531+00:00so level 1 goes to Vref?so level 1 goes to Vref?johnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-45682435560564563972013-10-27T07:56:06.398+00:002013-10-27T07:56:06.398+00:00Nope. I don't see anything wrong with it. The ...Nope. I don't see anything wrong with it. The schematic may throw you off as it uses standard ground symbol as vref and usual vref symbol as ground.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-9644880490758998582013-10-27T07:40:41.607+00:002013-10-27T07:40:41.607+00:00Hmmm... That would ground the vref.. But there is ...Hmmm... That would ground the vref.. But there is an error with the left hand side 33k. I'll fix it asap.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-77023017885306333712013-10-27T02:11:29.319+00:002013-10-27T02:11:29.319+00:00looking at the schematic, if i'm not mistaken,...looking at the schematic, if i'm not mistaken, I think that the blue dot on the ground's double link should be moved down one row.johnkhttps://www.blogger.com/profile/00643996045674470081noreply@blogger.com