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11 Gauge
July 31st, 2009, 09:42 PM
Well, once again - the devil does find time for idle hands. Not that I'm not busy, but it's always fun to squeeze one more project in.
The criteria for this project were as follows:
- Replace the guts of my OCD clone with something "better"
- Utilize one of the wonderful LM308N chips that I have in my possession
- Repurpose the OCD clone enclosure (for the zillionth time)
- Populate the pcb with spare or pulled components as much as possible
- Add in a few Rat tweaks, mainly thanks to Martin C (a.k.a. Soul Sonic)
...What you see below is the result of this madness. Since it's a repurposed build, I'm calling it the Dumpster Rat. The crappy pcb is one of the remaining hunks of thin stuff that I got from Electronics Goldmine. The caps are a mix of polarized and NP electros, spendy metal films, and a few Xicon greenies (or reds!).
Some of the "twists" are as follows:
- Filter circuit is a 20K/.018uF combination.
- 7pF compensation cap.
- .56uF/100 ohm HP filter "leg" that is removed with the Ruetz Mod.
- 2N5457 buffer o/p tranny.
- 10uF coupling cap on 308's output
There are few other subtle tweaks here and there, but it all adds up to a Rat variation with less mids, a slightly more polite full gain mode, and better note definition due to the smaller compensation cap (Martin's mod uses an even smaller cap - like 3pF!).
The faux chrome on the enclosure is a hunk of "temporary" rear view mirror material (plastic). It scratches super easily, but seems to add to the vibe. But the blue edges and candy apple knobs do clash, I admit.
It's amazing - all of these years later, the Rat still is one of the better extreme dirt boxes, IMO. This thing, even in modded form, simply smokes the OCD into a pile of cinders!
The criteria for this project were as follows:
- Replace the guts of my OCD clone with something "better"
- Utilize one of the wonderful LM308N chips that I have in my possession
- Repurpose the OCD clone enclosure (for the zillionth time)
- Populate the pcb with spare or pulled components as much as possible
- Add in a few Rat tweaks, mainly thanks to Martin C (a.k.a. Soul Sonic)
...What you see below is the result of this madness. Since it's a repurposed build, I'm calling it the Dumpster Rat. The crappy pcb is one of the remaining hunks of thin stuff that I got from Electronics Goldmine. The caps are a mix of polarized and NP electros, spendy metal films, and a few Xicon greenies (or reds!).
Some of the "twists" are as follows:
- Filter circuit is a 20K/.018uF combination.
- 7pF compensation cap.
- .56uF/100 ohm HP filter "leg" that is removed with the Ruetz Mod.
- 2N5457 buffer o/p tranny.
- 10uF coupling cap on 308's output
There are few other subtle tweaks here and there, but it all adds up to a Rat variation with less mids, a slightly more polite full gain mode, and better note definition due to the smaller compensation cap (Martin's mod uses an even smaller cap - like 3pF!).
The faux chrome on the enclosure is a hunk of "temporary" rear view mirror material (plastic). It scratches super easily, but seems to add to the vibe. But the blue edges and candy apple knobs do clash, I admit.
It's amazing - all of these years later, the Rat still is one of the better extreme dirt boxes, IMO. This thing, even in modded form, simply smokes the OCD into a pile of cinders!