I got it going now but its all crunchy sounding and the volume is really really low. I brought it to a local amp builder and he said he thinks it might be a bad resistor. He referred me to another guy with proper test equipment. Any of you guys have any ideas?

Kevin

Hey man, I just got one of these bad boys. Its the 2203 not sure if their different sizes Ill measure it up quick for you. The weight on niks site says 35kg, or about 70lbs. Its got some serious weight to it



Length Chassis:26 and 1/2 inches (i included the bent tabs to fasten down the chassis)
High of chassis:  2 1/2
Width of chassis: 6 3/4
Highest point from bottom to top (bottom of chassis to top of transformer) : 7 and 1/2

Please dont build off these haha, their just roughly done with a tape measure.

Kevin

Whats a good way to go about learning about how a guitar amp actually works? Are there any good sites or books that breaks down why everything is used how it effects the circuit and what not. As for the amp I'm still in the process of checking for shorts, I found someone nearby that said they would give me a hand. Hopefully we can get it working.

Kevin

I dont have access to any other tubes. Does Nik post the schematics anywhere?

Kevin

I didnt measure the plate voltage, Nik told me to shoot for 35mV-40mV for the bias So I set it to 35

Kevin

Yeah, thats what Nik told me to do. I swapped the leads warmed it up and biased it. Then plugged a guitar in and it played for about 30seconds and popped the 1A fuse. I touched up the 2 ends i swapped to make sure they were a bit cleaner and tried again and about 6 seconds after i turned it on it popped the 1A fuse again.

Kevin

Now its playing this loud squeel through the amp when you shut off standby and the volumes are all turned to 0

Kevin

that would be cool

Kevin

what is a light bulb limiter?

Kevin

I just noticed my 1A fuse is blown, I just replaced it with a new one cause my dad dropped it and it broke. I never though to check a fuse right from the store but maybe thats the problem. I followed to voltage and it stopped there. I doubt thats the problem cause i think it was good at one point. Im gonna stop at the store tomorro and buy a few fuses.

Kevin

The diodes came assembled on the board and are facing the right way. It sends 242 volts through each of the transformer wires going through the SB switch and the switch works correctly.

Kevin

whats the HT point?

Kevin

well its not really 0 ohms that wouldnt be possible, its a very low resistance meaning its good. If it was broken it would read infinite resistance.

Kevin

I have -42 volts at pin 4 with respect to ground. I have the EL34 tubes. At point E on the schematic Im reading voltage and it seems I am everywhere across the board. I checked my fuses with an ohm meter their both reading 0 ohms.

I have 0 voltage at K on the schematic and at both plate voltages. It seems my output transformer isnt putting out any power.

Kevin

Yeah I did all that. I noticed when I measure from Pin3 to ground I dont get any voltage on the power tubes. Their directly connected to the OT plates, shouldn't i be reading some voltage?

Kevin