![]() ![]() I added 1Ω resistors to the output tube cathodes for convenience of biasing the amp (another unnecessary improvement since in Leo's time they simply used the 'set it and forget it' bias method). I used a 1500Ω cathode resistor for V1B because the Lite doesn't share a cathode resistor with another tube like the original. I added another bias cap simply for a smoother bias voltage (an improvement IMO, but certainly not necessary in a cost controlled production amp). I added the 220K bleeder resistor across the first filter cap to discharge the B+ more quickly when the amp is turned off. I used 20♟ or 22♟ power supply caps simply because they are more common today than the 16♟s which were common when that amp was first in production. 001 PI coupling cap :, this is a fully tested, working layout.ĭo you mean the Deluxe Lite? I kept the circuit as near identical to the original as I could. Note: Although I forgot to include in this layout the 820 ohm NFB resistor, and. Here is a fun single channel AB763 amp stuffed in a chassis about the size of tweed deluxe.ĭumble style mid boost on the switch, and a power supply sag resistor.Īlthough this layout started out as another manufacturers layout design, but I cut, modified, folded, spindled, boiled, pickled, mashed, diced and chopped it to ab763 specs. Good lead dress becomes much more critical in smaller chassis', though. Using Xicon MPP caps like Doug sells make stuffing an amp in a small chassis much easier. You can put the whole ab763 preamp on a few small terminal strips and eschew the eyelet board topology, also. ![]() If you move away from that style of layout thinking, you will surprise yourself at how much amp you can stuff in a small space. Some folks seem to think that the leads on components must stick out 2" on each side for it to be "correct". Like Sluckey's awesome Tweed ab763 and AB763-lite builds, you can stuff it all into a very small tweed style chassis if you keep your layout tidy. I'll be going with a blank one most likely so size and money are both major factors. Can anyone shed some light on this for me?Īny recommendations on what would be the smallest and best shape chasis to use for this? I can't afford a nice, pre-drilled one. The knobs on the front type might be actually leave more speaker room because the transformers can be more toward the back, though the speaker has to be a little lower. I originally thought a chasis like the one on my Pro Jr., with the knobs on top, would make the most sense because the chasis doesn't extend all the way to the front which might leave more room for mounting a speaker. I'll build the cabinet after I make a decision on the speaker to use. I plan to make the amp first and find some safe way to mount it or support it while I try different speakers/cabs. This amp may need to be a little bigger because I plan to use a 12" speaker, though I'm not 100% sure about that yet either. and Vox Pathfinder 15R are pretty much ideal in the size department. Keep in mind my goal is to keep this thing as small as is reasonably possible. I'm a basement player so I don't gig with it.Įvery review you listen to or read on the Champ sings its praises.While I'm still trying to make sure I have the design right I'm also starting to think about what would be the best size/shape of chasis to use for this project and could use some input from people with experience. And I use a Boss Fender '63 Reverb pedal. I've upgraded it with a Warehouse G8C speaker. Ive had Vox Pathfinder 15R for many years and I love it. Anyone else hate it? How is it possible it can be that bad, especially for that kind of money? The Fender is completely handwired, has a solid pine cab, uses a Weber Alnico speaker and lists for $1200.Įvery review you listen to or read on the Champ sings its praises. I paid $70 for the Vox and $50 for the speaker. I plugged it back into the little Vox Pathfinder. It sounded muddy, lifeless, anemic, flat and terrible, even with the reverb pedal with its tone knob turned nearly all the way up. And was completely and utterly disappointed. I found a Fender '57 Custom Champ on a great deal through the Sweetwater Gear Exchange. I'm a basement player so I don't gig with it.īut I started thinking I could probably get better sound from a tube amp. ![]()
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