2203 build

Jd267 · Post by **Jd267** » Thu Aug 13, 2015 7:38 pm

hey what's up guys so I built a 2203 clone and added a forth gain stage up front half triode, found a layout SDM that is and made a few changes etc . I'm looking to make the amp really tight for metal playing, I changed the value of the first filter cap to 2.2nf second to 2.2nf and third to 4.7 nf and for sure made a world of difference but it's still could sound better . Looking for tight low end thump, Changed the slope resistor to 68k and tremble cap to 250pf also PI cap to 250 also. Here is the layout I used .

I used 220nf for first cathode cap, 1uf for second and none on 820ohm cathode resistor just so you guys know .

Haze13 · Post by **Haze13** » Fri Aug 14, 2015 3:48 am

4 gain stages... Make an ENGL type from it, and you will be much closer to the thing you want.
I have a JCM800 50watt and I use a Soldano GTO clone in front of it... Well, 7 gain stages is more than enough for me:) Plus the noise is very low, because of the DC for the heaters in the GTO clone. Add a PPIMV Lar/Mar - works very well.

Jd267 · Post by **Jd267** » Fri Aug 14, 2015 8:50 am

Anyone else have any input? Figure this is the place to ask these kinds of questions

danman · Post by **danman** » Fri Aug 14, 2015 4:44 pm

In my 2204 build, I added a fixed resonance cap to the NFB circuit and used a 27k on the 16ohm tap. It's an unusual NFB setup but it did help to tighten up the bass considerably.

Jd267 · Post by **Jd267** » Fri Aug 14, 2015 10:17 pm

danman wrote:In my 2204 build, I added a fixed resonance cap to the NFB circuit and used a 27k on the 16ohm tap. It's an unusual NFB setup but it did help to tighten up the bass considerably.

Cool trick man . I added a resonance mod with 1 meg pot with switch to go to 8 ohm tap and 16. Going to try the 4 ohm tap tomorrow . The amp is really dark sounding I'm looking to get some more highs out of it . The tremble pot is maxed out which is kind of weird for a 2203 type. How could I get some more tremble range back?

syscokid · Post by **syscokid** » Sat Aug 15, 2015 12:17 am

Good job on illustrating your mods with SDM's layouts. I love stuff like this...

Jd267 · Post by **Jd267** » Sat Aug 15, 2015 9:47 am

syscokid wrote:Good job on illustrating your mods with SDM's layouts. I love stuff like this...

Thanks man yea I built a 2203 ceriatone kit then changed it to the SDM layout was a little tricky but pulled it off, then changed a few things to my liking . The amp really slays just trying to voice it now . The tone stack only has 4 components seems there is not that much you can do to it. Got a 68k slope resistor which I like, tried a few different caps also . Would like some more hair from it . The tremble pot is maxed out and could use some more highs.

herbvis · Post by **herbvis** » Sat Aug 15, 2015 10:50 am

Put the cap back on the gain pot. I like a 5n personally but 1n is a good place to start. Removing the cap works for some people. But for me personally, I think it neuters the amp too much. Takes away the bite and some aggressiveness.

Jd267 · Post by **Jd267** » Sat Aug 15, 2015 12:34 pm

herbvis wrote:Put the cap back on the gain pot. I like a 5n personally but 1n is a good place to start. Removing the cap works for some people. But for me personally, I think it neuters the amp too much. Takes away the bite and some aggressiveness.

I agree I did put it back also put the resistor back . Thx

Stone · Post by **Stone** » Sat Aug 22, 2015 6:00 am

Hi

From a very short look to the layout it seems to me that you are going from the 1st (extra) stage to a 68k / 220k divider through a 220k grid stopper into the original "1st" stage, right?

If so, I think, this is way too much - try to raise the 68k (I would recommend a 500kB pot for testing instead of 68k/220k. If you miss some highs, lower the 100pF PI cap to 47 or even less (you can also remove it).

What kind of tones you are in? Is it more a "grind" crunchy tone for the lower notes or is it a overdriven mid scooped for rhythm?

Regards, Stone

Jd267 · Post by **Jd267** » Mon Sep 14, 2015 9:26 am

Stone wrote:Hi

From a very short look to the layout it seems to me that you are going from the 1st (extra) stage to a 68k / 220k divider through a 220k grid stopper into the original "1st" stage, right?

If so, I think, this is way too much - try to raise the 68k (I would recommend a 500kB pot for testing instead of 68k/220k. If you miss some highs, lower the 100pF PI cap to 47 or even less (you can also remove it).

What kind of tones you are in? Is it more a "grind" crunchy tone for the lower notes or is it a overdriven mid scooped for rhythm?

Regards, Stone

Think this is way to much what?

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