Tube Amp Archive

So I found the biggest problem, and it was just a shorted switchcraft jack. I replaced it and now the gain channel is "mostly" working. The resistor on the gain pot wiper seems to be intended to "tame" a bit the gain before the second gain stage. I tried 470k, 470k+220k, and 1M. The later produced t...

Is this the schematic you followed? Did you separate V1s cathodes as instructed? https://robrobinette.com/images/Guitar/5E3P_Build/5e3p_Cascade_Mod_Schematic.png Layout and wire routing become more critical once you cascade the preamp triodes. Show us a hi-rez pic of your actual amp. Yes, on the Ro...

Hi Guys, I buit a 5E3 RobRob deluxe following Rob's istruction and everithyng worked just fine. However, I found the lead channel kind of useless to me as it is very similar to the normal channel, and decided to implement the gain cascading mod, keeping all other spects the same as the RobRob Deluxe...

pineapple wrote: ↑Sun Dec 08, 2024 10:53 pm Nice job on the Layout. Did this work out well? I have an OTT build that I may get the TMB treatment.

Hey pineapple. See my update! It turned out very good!

Thank you very much for the time you took yo look into it, it was very helpful! I see the B+ concern you pointed out and will fix it right away. I totally see that I should have the TMB after a coupling capacitor and will amend the design. I will also take into consideration all other suggestions as...

I used separate bypass cathode resistors and caps for the lead and normal channels. Most tube wires are connected to the turrets below the board. I also didn't bridge the two options as the normal channel goes to V1 pin 8 and the lead to V1 pin 3.

Update: I finally finished my project, after buiding it and testing many changes/alternatives to make it sound right, given that I used my own tentative selection of PT and OT. The James Baxandall works like a charm and having it switchable was definitely right as it drops volume a lot! Anyways, the...

Just built this amp as my first project ever. I decided to go full throttle on the diy and sorted 100% of the parts myself, without starting with any kit. I also used a blank chassis as I really don't like the facing-up style chassis and wanted all toggles on the faceplate. I finished it literally 2...