12b4, 6ca4 build questions....
- Thread starter saltwater
- Start date
bricktop
Couch woofer
Yikes! I bet that stung.
Swapped as in put a new one in or flipped its direction? Are the plate voltages still too high?
saltwater
Super Member
Its done i hope!
Any faults in this? I think it looks good! the ccs was a big chore, but brick sent some resistors to use in its place fr now till he makes a board! But heres some glam shots of the under belly, If i get the all clear, im gonna load the tubes, and power it up!
Any faults in this? I think it looks good! the ccs was a big chore, but brick sent some resistors to use in its place fr now till he makes a board! But heres some glam shots of the under belly, If i get the all clear, im gonna load the tubes, and power it up!
bricktop
Couch woofer
Looks good to me! I'd say fire it up.
If your power amp or CD player has an earth grounded plug too, you may have potential for a ground loop there since your circuit is earth grounded. We'll cross that bridge if/when we get to it.
if it hums, it is either the above, the fact you may need dc heaters, or power supply ripple. I think you should have about 1-2 mV of fuzz on the output, you may or may not hear it with your setup (need efficient speakers and/or high gain amplifier) just ask Jay about his recent humming problem
If your power amp or CD player has an earth grounded plug too, you may have potential for a ground loop there since your circuit is earth grounded. We'll cross that bridge if/when we get to it.
if it hums, it is either the above, the fact you may need dc heaters, or power supply ripple. I think you should have about 1-2 mV of fuzz on the output, you may or may not hear it with your setup (need efficient speakers and/or high gain amplifier) just ask Jay about his recent humming problem
saltwater
Super Member
you guys are great! alright ill fire her up, snap some photos of the "top-pics" bolly, wish i could set it down, but i have to seit up like a kick stand for me to do anything! last time i put some noise thru it, it was really low, and i had my amp cranked to the max, and it wasnt loud, but we'll see!
bricktop
Couch woofer
In this (http://i226.photobucket.com/albums/dd198/justineakins/12b49001.jpg) picture, I can't see where the top right and bottom left ground buss bars are connected. Are they connected? As for the volume pot problem, it's prolly gotta be either a ground is disconnected or the input is shorted to the output. Check for little pieces of solder and all that.
saltwater
Super Member
itll be wrapped, thanks for noticing! red and yellow is the ground by the way... I must say this does have alot of gain, and it is touchy, very warm sounding to! i got to figure out whats wrong w/ this volume pot though.... i cant see any splatter anywhere shorting something. cables i used are good. im gonna put a ground bar connecting the two bars. see what happens!
bricktop
Couch woofer
Yup. Make sure they are connected together.
