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Cupped finish washers are the usual way to secure screws. You need oval or flat screws with them.
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I was mainly interested in it as a reduced output power scheme. I guess there are other ways to accomplish that objective, but it was curiousity thing.
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From the Caig website:
4. Potentiometer Maintenance
The following guidelines have been established based on the experience and feedback of technical...
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Deoxit and Liquid Wrench are nothing the same. Don't use it, or WD40 or gasoline in any of your pots.
There should be an opening at the solder tab...
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Thanks for the suggestion, Hardtailed. I'll look into that option for this project.
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Proud to Show
Just got my first amp, a 5F2-A, completed. Cabinet work too quite a while (I was lucky to have a generous friend with a woodshop). The electronics build went...
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Epiphone does a similar thing in its Blues Custom 30. There I see the screens of the 5881s are switched via a 500R between the plate and a lower voltage from...
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I can't post the schematic. It's in multiple parts, but here's the link to the Traynor service manual that has the schematics (it's a 3.5MB PDF).
...Last edited by Johno; 03-10-2010, 08:46 PM.
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Switchable Class A/AB
I'd like to build an amp similar to the Traynor YCS50 or Jackson Britian. El34 output tube configuaration with switchable Class A/AB, going from 15W to 50W....
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The switch bypasses the 22K resisitor in the cathode leg of V2B, thus putting the 0.68 cap directly to ground. That should have the effect of rolling off...
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The hum is gone!
I cut the ground bus on the eyelet board, which separated the audio cathode resistors from the PS caps, and connected the audio ground...
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Volume does not affect hum. Cathode of input stage is grounded on the eyelet board ground bus (which also attaches PS caps and has a single connection to...Last edited by Johno; 10-28-2009, 03:19 AM.
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Further info: I have used isolating 1/4" jacks for input and speaker.
Thanks Tele-cat for your response.
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5F2-A Hum Problem
This is my first guitar amp build, based on Steve Milberger's schematic and layout. Star grounding (deviating slightly from the layout with the input ground,...Last edited by Johno; 10-28-2009, 03:18 AM.
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