tag:blogger.com,1999:blog-163956915063920487.post8340982022019577357..comments2024-01-04T18:54:25.344-08:00Comments on akavalve: Fender Champion 600 Tone Stack Bypass/ Fat Switch Modakavalvehttp://www.blogger.com/profile/12711596868057550892noreply@blogger.comBlogger18125tag:blogger.com,1999:blog-163956915063920487.post-86580336369163013992015-04-14T10:15:45.919-07:002015-04-14T10:15:45.919-07:00Hello,
this is a great source of Information, tha...Hello,<br /><br />this is a great source of Information, thanks for the great pictures!<br /><br />I just got a Gretsch Electromatic G5222 amp (same as the Fender Champion 600). I will be performing some modifications which I got from alnicomagnet, mainly to reduce the hum/noise and to include a stand-by switch for the main power switch.<br /><br />I would also like to make the pre-set sound stack (AA764 voicing) switchable, similar to what you did, but without the fat switch functionality. I want to get close to the so-called 5E1 voicing.<br /><br />Based on the modification you did here, if I want to do that but without the fat switch, how do I need to wire that? I am a bit uncertain since this is my first amp project. Can I leave R19 where it is and just lift off one leg and go from there? Or do I have to remove R19 and bring it to a different position? And the additional coupling cap, can that stay where you have it in your Pictures?<br /><br />Any help you could provide to help out a newbie with regards to amm modifications would be much appreciated.<br /><br />All the best,<br />Rolandrjstaubernoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-81129023905306464112013-06-07T09:42:44.361-07:002013-06-07T09:42:44.361-07:00Hi.
The FAT SWITCH, it's an ON/ON/on DPDT swi...Hi.<br /><br />The FAT SWITCH, it's an ON/ON/on DPDT switch?... or I can use a ON / ON switch?<br /><br />Thanks!Enrico Vitalihttps://www.blogger.com/profile/05380473202975770109noreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-73815317001033706232012-12-06T01:54:04.681-08:002012-12-06T01:54:04.681-08:00Big thank you to akavalve for this site, it is fan...Big thank you to akavalve for this site, it is fantastic! And thanks to everyone who has posted comments :-) <br /><br />Eric, just to confirm then, where should the cap be spliced in? ie which end of c1 and r21?<br /><br />Also, with the fat switch, is it possible to use a pot rather than the three resistors? If so which value would be best?<br /><br />Thanks again! <br /><br />Simon.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-26106214732417234282012-11-15T01:05:22.325-08:002012-11-15T01:05:22.325-08:00Ooops, just wrote it wrong. I meant your picture s...Ooops, just wrote it wrong. I meant your picture shows the 0.1µF cap in parralel with R21.EricLnoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-10789360585735733592012-11-15T01:02:56.211-08:002012-11-15T01:02:56.211-08:00I confirm that your mod shows the bypass cap in pa...I confirm that your mod shows the bypass cap in parralel of C1 and only C1. The 0.1µ cap should have been soldered to the other pin of C1.EricLnoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-40251173204421539012011-12-19T07:19:22.692-08:002011-12-19T07:19:22.692-08:00Hello Eolon,
It's been a good while since I&#...Hello Eolon,<br /><br />It's been a good while since I've done this and I don't have a board in front of me to check, but the idea was to take the signal from pin 1 of the first gain stage and connect it to the top of the volume control using a large enough capacitor to swamp out any effects from the tone stack. So the 0.1 uF cap should be in parallel with the 150 pF cap and R21. I think the measurements bear that out, but If it is actually in series, that' s my error....maybe someone with an open amp can check?<br /><br />Best, Andyakavalvehttps://www.blogger.com/profile/12711596868057550892noreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-41591640349602931922011-12-19T04:46:34.747-08:002011-12-19T04:46:34.747-08:00Hello:
Sorry to barge in here, but if you are byp...Hello:<br /><br />Sorry to barge in here, but if you are bypassing the tone stack with a 0.1 uF capacitor in series with C1, the net capacitance, assuming you disconnected the tone stack at R19, is still 150 pF, as stock. If you have the capacitor in parallel, the value is 0.1 uF.<br /><br />I bypass the tone stack and use a 0.0033 uF cap switched in parallel with the stock 150 pF, but on the "other side" of the 150k R21.<br /><br />This seems to give very good results, and I was wondering if you have tried it.<br /><br />Thanks, and<br /><br />Best Regards,<br /><br />e<br />.::.eolonhttps://www.blogger.com/profile/09082874281012399156noreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-6826659185961067052011-01-05T07:09:11.869-08:002011-01-05T07:09:11.869-08:00It just needs to be an 2 pole ON-ON. The one that ...It just needs to be an 2 pole ON-ON. The one that shows in the pic is 3 pole, but one is not used. <br /><br />Best, Andyakavalvehttps://www.blogger.com/profile/12711596868057550892noreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-19479192976317370592011-01-05T06:33:32.933-08:002011-01-05T06:33:32.933-08:00what is the bypass switch that you use for the ton...what is the bypass switch that you use for the tone stack bypass ?! <br /><br />on-none-on ?! <br /><br />3 way or 2 ?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-9405950701986278392010-10-16T21:32:50.672-07:002010-10-16T21:32:50.672-07:00Actually after thinking about it, it's pretty ...Actually after thinking about it, it's pretty obvious how to just do the bypass switch. Thanks for the detailed pictures!Terrynoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-46177713793175747052010-10-16T12:36:00.913-07:002010-10-16T12:36:00.913-07:00I too would like to know how to do the bypass swit...I too would like to know how to do the bypass switch without the fat switch.Terrynoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-83389746589470925592010-10-14T13:17:14.995-07:002010-10-14T13:17:14.995-07:00I would also like to know how to make a tone stack...I would also like to know how to make a tone stack bypass switch by itself. also how much louder does it seem when the stack is bypassed?cell2057Cell2057cellAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-10526081000157141232010-07-16T04:18:36.019-07:002010-07-16T04:18:36.019-07:00Great mods!
I have a question: how can I do the ...Great mods! <br /><br />I have a question: how can I do the bypass mod without the fat mod? Thanks!Christophnoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-5636905069371210402010-06-24T13:15:48.583-07:002010-06-24T13:15:48.583-07:00I'm thinking about this mod, but I'd like ...I'm thinking about this mod, but I'd like to put a pot and cap there instead of resistors, I'm just wondering what values would be best for giving it the "fat" boost. This is my first messing around with the insides of the actual amp here, so assume that I know nothing, all help is appreciated.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-29314038286099259012010-05-28T03:27:26.942-07:002010-05-28T03:27:26.942-07:00To install the 3 way fat boost without the tone st...To install the 3 way fat boost without the tone stack bypass:<br /><br />The junction of the three resistors that connects to the tone stack bypass switch just needs to be connected directly to the black wire from the tone stack switch that leads to the bottom of R19. Make sure to do this in a way so that it is not free to move.<br /><br />The yellow wires connected to the tone stack bypass switch are eliminated. The large .1uF capacitor is also eliminated.<br /><br />That should do it. Let me know if you need any clarification. <br /><br />Best, Andyakavalvehttps://www.blogger.com/profile/12711596868057550892noreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-47169315538234563132010-05-27T20:25:09.956-07:002010-05-27T20:25:09.956-07:00Can you please tell me how I can go about doing on...Can you please tell me how I can go about doing only the 3 way boost mod without the bypass switch? I have the 3 way mini toggle (with the six lugs) and the proper resistors, but I am not sure how to connect everything.MrPotatoHeadhttps://www.blogger.com/profile/09576064850155628993noreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-51044392203581461002009-03-22T18:07:00.000-07:002009-03-22T18:07:00.000-07:00I've done the fat switch mod using a DPDT switch. ...I've done the fat switch mod using a DPDT switch. I would like to make it footswitchable while keeping the switch. How would I go about that?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-7059703446590720802009-03-01T15:36:00.000-08:002009-03-01T15:36:00.000-08:00Nice work. What switches did you use?Nice work. What switches did you use?Anonymousnoreply@blogger.com