|
Hello Everyone, New to this forum.
I recently completed my first amp build. The overall assembly process was not to complicated thanks to the nice color schematic that I received with the kit.
Here's where I have been:
I checked every solder joint and jumper and rung out the entire schematic for continuity prior to powering up. I checked each lug on the socket and tested to key points on the board as I followed the schematic.
After making sure all looked well, I flipped the switch.
I saw no smoke, and heard no sizzle. At this point I started checking voltage across the caps and noticed all were way high and out of spec. I poked and prodded to see If I could find something wrong. Thats when I noticed I left off the ground lead that grounds the jumper between the 250 Ohm resistor and 16uf Cap.
basically when I booted up the amp the first Cap was not gounded.
After fixing, I have no sound coming out of the speaker.
I can check the caps with a volt meter and produce a crackle and pop.
I have re wired the jacks and also re wired the coax that connects the volume pot to the 2nd lug on V2.
no improvement.
I'm confident that I have no missing jumpers and all of joints seem to be "nice and shiny".
Is there a chance I fried something when I powered up the Amp with the missing ground?
posted below are my current voltages.
-Thanks a million for your help.
can't wait to hear the fruits of my labor.
V1
Pin 1 122.8 (120)
Pin 3 2.0 (2.0)
Pin 6 122.2 (123)
Pin 8 2.0 (2.0)
V2
Pin 1 160.0 (167)
Pin 3 1.27 (1.1)
Pin 6 193.0 (175)
Pin 8 49.8 (70.5)
V3
Pin 3 371 (380)
Pin 4 329 (338)
Pin 8 20.7 (22)
V4
Pin 3 372 (382)
Pin 4 330 (339)
Pin 8 20.7 (22)
V5 rectifier
Pin 4 350 (384)
Pin 6 350 (384)
Heater wires 6.4 (6.3)
|
Login
Register
FAQ
Search
