Tube Amp Archive

still having issues with the bolts on the PT. I looked closer at the bolts and they have some kind of yellow-ish dust caked into the threads and it's really difficult to get out. i went to home depot and got new bolts to replace them but i can't get the old ones off the PT. i think the dirt that is ...

In the layout I drew the ground switch is only serving as a tie point for the PT primary connections, so it is non-functional. In the bad old days before polarized, grounded wiring it was there to connect the so-called "death cap" to one side or the other of the mains supply, whichever was most qui...

also, i still really don't understand what this ground switch is for. the groundswitch has 3 connections. if you look at it in the orientation such as the side with one pin is on the right, and the side with 2 pins on the left, when the switch is in the right position, the side with one pin is conti...

i'm having a LOT of trouble mounting the PT. I went to home depot and got some 8-32 nuts and locking washers so i can attach it from the inside. for some reason they will only go about half way onto the bolt and then they just get stuck and dont want to turn anymore. this is with me using a screwdri...

wanted to check the orientations of ot and choke before I tighten them. does the order matter? I.e. which wires are closest to the holes?



also, any advice on getting the nuts off the pt? Not coming off easy at all

so yesterday i drilled the holes in the chassis and in the insulator board so that i could place the main circuit board into the chassis. the plan was to have a bolt and then a couple nuts to space between the bottom of the chassis and insulator board to clear the bolts that were used to secure the ...

hello everyone, it's been a long while.. been very busy but things are lightening up a little so im getting back into this project

Just wanted to say that I didn't have time to do all the drilling I wanted to do last weekend. I had to go back to school without the amp since I can't do any drilling here. Next time I'm home I will finish the drilling so I can bring the amp back with me to finish it

Yes all 5 go through the hole. Thanks for reminding me about the retainer clips. I'm not going to mount the board yet I just wanted to drill the holes for it. One stupid thing on my part is that I should have mounted the board before mounting the doghouse because now a couple of the place s I was go...

Also heres what I was talking about when I said the board kind of overlaps the hole for the ot. Opinions on how the board is placed before I begin to drill holes for it? I realize the whole board isnt shown I can take a better picture tomorrow but it's shown to start like half an inch to the left of...

I almost missed the ground lug on the inner side of the left (as seen in the picture above) power tube socket. It would be better if you put the tube sockets on the outside of the chassis so that the ground lugs contact the chassis directly. Will they fit that way? On the choke wiring, the image wi...

I cant do multiple attachments from phone for some reason

[quote="martin manning"]I almost missed the ground lug on the inner side of the left (as seen in the picture above) power tube socket. It would be better if you put the tube sockets on the outside of the chassis so that the ground lugs contact the chassis directly. Will they fit that way? On the cho...

Wanted to check the ground lugs

jus got back from the hardware store, shoudl have everything i need one thing i noticed when looking at a couple images: the choke seems to be wired to different eyelets? in this image: https://tubeamparchive.com/download/file.php?id=25711 and this image: https://tubeamparchive.com/files/modern_5f6_...