Cathode Bias Red Plating Discussion

[Mr_bibbles]

Hey,

Was working on a Krank Rev Jr. recently, tubes are red plating. I would post a schematic but I can't find one anywhere. It is a cathode...

[bungimeala]

I have acquired some time ago an Engl Savage 120 (built in 2011) which I guess never sounded "right", just kinda average. I have retubbed it, re-biased,...

[bobloblaws]

I have a Kent Model A-60 amp here, I'm guessing built sometime in the '60s. Unfortunately, no schematic. My tube tester showed the 5Y3 rectifier as very weak...

[emenasche]

I want to up the value of the cathode resistor for a pair of EL84s with what I've got on hand, and I'm wondering if this will work:

Schematic...

[isaac]

Hey guys. I built a Marshall single channel 18watt clone, but I built it with el 84's. Now I found Transformers that should work. The OT works fine, and I'm...

[Mr Johnny Birchwood]

So, I just got my Ampeg Gemini VI in good working order. Being as I am an incorrigible tinkerer and being that the parts for my next project wont arrive until...

[LAH]

This is my first post here so hello everyone!

here is the thing;

couple of days ago I finish building my first tube amp project,...

[jasonguitar]

I'm confused by the differing results of the direct plate current measurement vs cathode resistor measurement vs bias probes measurement with this Supro Golden...

[technicalxpectations]

Have a Laney VC30 on the bench. Owner had been powering it with generator and then HT fuse went. Reports that after replacing fuse, 2 of the 4 EL84's get...

[KingCameron]

Hello Guys,
I am looking for a "best known method" of installing adjustable bias in a 5E3 circuit. I have looked at Ted Weber's Mod (see...