Tube Amp Archive

Hey all Ive got a odd issue with a Egnater Tweaker. The master volume has just quit, nada nothing... From what Ive read it is a post PI master vol..I got the amp and the guy was running it on 4 ohms and didnt know it, should have been set on 16 ohms, Ive checked the pot the resistors and caps on the...

I am searching for a copy of a Berkley III preamp schematic I have a 1967 Vox Scorpion and it is a combanation of the Berkley III preamp and Guardsman power amp according to the vox showroom. I got distorted output on both channels with no clean head room and the trem seems to bleed through on both ...

I had to take a couple days off but am back to it now fellas. I will be digging in in the morning and yes I thank you Ritchie and the rest of you for your input. Btw there is no white 125v on this transformer just red and red and white and i am using the red and white it is a *eber w02530 tranny I d...

Ok thanks ...It is 335vdc on the screen grids. 350 on the plates. If I have a 500ohm 10 watt bias resistor will lowering the value, lower the voltage on the plate? Everyone is saying to use a 150 to 250 ohm it is currently a 500 ohm resistor here, does it need to be 10 watt My main goal is to get th...

Thanks Ritchie and Chris ...and every one else I do have a grasp on what i need to do now. Hopefully I can figure it out think I got a good shot and will give her a go But one last dumb question What is the purpose of the 100 omh resistor R11 100 ohm 5w... if it is not the bias resistor and Ive been...

Thanks guys ...Yes alot to process will check for bad joint on the 470's Ok dumb question but I am referring to R11 100 ohm 5 watt as the Bias resistor am I correct here ? not the 500ohm cement resistor (I used a 500 ohm instead of the 2 250ohms they sent me) tied to the 150v 100uf cathode cap to gr...

Thanks for your help guys. I will make some changes see if i can reign in the bias and try your suggestions. The 18 watt site isnt letting no one sign up i guess ?? I tried.. Ive researched alot of weber builds and they all look older and different. That is how I ended up here reading one of your po...

Hi all Just joined up. Like your forums..Could use some help so here I am. I did a weber 18 watt tmb and I built right to the layout weber did not send correct tweaking resistors for me to try to adjust some things.. Any how I am a at home techy that helps alot of buddies out for meager profit, Ive ...