Preamp stage problems on a Marshall JCM 800 - 2204 build.

[arwokc]

Hey guys, I decided to try my hand at a JCM 800, 50-watt, 2204 clone. As you might guess, I've run into a snag. I used the Ceriatone layout found here.

http://www.ceriatone.com/images/layo...4Ceriatone.jpg

Upon power up, I get an awesome, crystal clear, clean tone. No hum or hiss, but no gain either. At full volume, I get the same clean, clear tone and only about 1/4 the volume it should have. After reviewing the voltages of a stock JCM 800, It appears that the power section is about right. But the preamp voltages are out of wack. I've double checked all the resistor values three times, not to mention I ohmed them out as I installed them. I've triple checked the capacitors as well. I thought for sure, I must have gotten one of the leads underneath the back side of the circuit board wrong, but I've triple checked them also. I rang the leads out from the preamp tubes to each spot on the circuit board to verify correct connections. I've replaced the tubes with other new tubes. I've even swapped in transformers out of another 50 watter I'm preparing to build. I reviewed the input jack wiring as well. It kills me to admit defeat or to ask for help, but I'm stumped. Maybe I just need a fresh set of eyes to look at it objectively. Here is a schematic with voltages from a bone stock 2204 from Mark Huss's site that I have been referring to.

http://www.mhuss.com/MyJCM/JCM800_2204.pdf

Here are the pin voltages on my build.

http://www.el34world.com/forms/valvedata/2204volts.htm

It would appear that my problem is in the preamp section somewhere. My first impression is that the preamp tubes are not biased correctly and have the tubes nearly shut off or that I'm not dropping enough voltage. Anyone have any suggestions where my problem may lie?

Thanks in advance,

Andy