Structo wrote:I know Bob but I have found that if the input side is 4-6v DC higher, I get the desired overtones.
And if I' hit 120MPH on the freeway, the laundry will be done.
What you have is a coincidence. If the tolerance of the grid load resistors is slightly different, bias of the tube changes etc, everything will be different.
Tone Merc, you should be able to solder to the back of the pots unless they are AL (but doubt, it). You may need to scrape or slightly sand the back of the pot with a scotchbrite pad to get the surface down to bare metal. I have had no problems using this method.
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David Root wrote:If you use the copper bussbar a la HAD you can use any kind of pot, and the more coax runs you have to pots the better you'll like it!
I agree David. If you zoom into the pic posted , you can see solid core wire attached to a few of the left pot terminals. I found once most of the wiring was in place, attaching the ground buss to the solid core pot jumpers made the build easier.
Bob, I do the same thing. I'll have 4 or 5 solid-core ground wire jumpers sticking straight out, and I'll just lay the buss bar in them and curl them around the bar, then solder. Works great.
Wife: How many amps do you need?
Me: Just one more...
Iv'e attached both shield to the pot casings and to the SC ground buss and I honestly can't tell any difference noise .. The only thing I see that could be of any advantage is securing it to the pot casing helps secure the coax less chance of it breaking/bending at the pot lug if the buss get's bent for whatever reason..FWIW
Tony
" The psychics on my bench is the same as Dumble'"
BobW wrote:Jelle, Thanks for noticing. The white coax is a MIL-C-17 version of RG-142. Teflon jacket and dielectric, 18 AWG Au/Cu center conductor and braid.
Where do you get that stuff? My coax melts like butter whenever you get the iron near the conductor...
The melt back is primarily why a lot of us prefer Teflon insulated hookup wire and shielded cable.
It doesn't melt and although it is sometimes difficult to strip it pays dividends in appearance and functionality in the end.
Be careful when buying the shielded cable as a lot of it has high capacitance which can rob the high frequencies if you are not careful.
