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Jet City JCA20H Choke Mod - Part Deux

Got a chance to work on the JC amp again. Here is what I have done so far.

Board Ready For Mods

BoardReadyForMods.jpg?t=1303395798

Resoldering the solder blobs on the wires.

Typical of cheap labor I guess. Sorry for the not so clear pic but if you can see the wire attached to the board, there are solder blobs - ugh.

ResolderingSolderBlobs.jpg?t=1303395798

R3 Removed and wires are soldered properly now

R3Removed-1.jpg?t=1303395798

Board before PC traces to be cut

BoardBeforeAlteringCathodeGround.jpg?t=1

PC Traces Cut

WireGroundCut-1.jpg?t=1303395798

One of the 1 Ohm resistors added

OneOhmResistorSolderedIn-1.jpg?t=1303395

All Components Wired Up

EverythingisWiredUpandReadyforBiasing.jp

Closeup of Mods made

Closeupof1OhmResistorandChokeMod-1.jpg?t

All Assembled and Ready to be Biased

ReadytoGo.jpg?t=1303396075

Biasing will be done later today along with taking all of the new voltage measurements for the maintenance record. I will get a chance

I keep hearing about a depth mod that requires two parts - a pot and a cap. I will order the parts this weekend to try it out. I have heard that it helps when playing on low volumes and adds to the sound, the question is what is the effect on stage volumes and when I play at the amps sweet spot.....
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Re: Jet City JCA20H Choke Mod - Part Deux

5/16/2011 12:11 AM

Warren Hunt (5730) wrote:

Hay bro did you ever get the depth mod or find out more about it?

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Re: Jet City JCA20H Choke Mod - Part Deux

5/16/2011 9:52 AM

Randy Hano (12149) wrote:

I will send it to you bro!

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Re: Jet City JCA20H Choke Mod - Part Deux

5/16/2011 11:04 PM

Warren Hunt (5730) wrote:

Thanks bro your d man.