It should make about 10 clean watts per channel. No specific application. I enjoy building tube amps and comparing how they sound to my other amps (solid state Class AB and Class D).
Under the hood look after mounting the transformers. Looks super messy with all those leads everywhere.
I am reusing these output transformers for the 3rd project, so their leads are already cut way too short to land them where they need to go.
Looks great so far!!
Why change around the wiring on the output trans input strip?
Where did you get those black terminal strips? I have been looking for some, and haven’t found any reasonably priced ones. The amp looks fantastic by the way!!
Many different sizes… and they are cheap!
Terminal Board with 5 Dual Terminals | TubeDepot.com
The metal rivets that hold the terminals to the phenolic strip protrude slightly through the back. I used some cheap nylon 6-32 bolts threaded in from the back (the heads were the spacer, then a dab of high heat epoxy to fasten them to the top plate.
The red lead of the output transformers are the B+ connection, so I wanted both of those towards the center where the power supply is. Then the other 4 wires are in the same order from right to left. I want each channel of the amp wired the same, not mirror images of each other. That just makes it easier for me to keep everything straight since the tube terminals will be in identical locations.
This could be the last amp I build
My eyes are getting pretty bad. I feel like I’m half ass’n my wire stripping and solder joints. The Opto Dr told me last fall that I have cataracts in both eyes. I have a few other eye issues as well. Maybe cataract surgery will help.
Welcome to getting old. OptoVisor for the win!
Yep - Dr said I have cataracts forming too. I have to wear the visor more often now & low light is also an issue.
Sorry to hear that. But, I’m certainly appreciating your quality of work - the pics show you ‘have skills’
I bought a cheap magnifier headband from HF last night. Just over $13 with a President’s Day weekend 15% off coupon. Hopefully it helps me see what I am doing.
Thats a tool that should come with an automatic senior citizen discount. ![]()
I’m not a senior citizen yet… but definitely an AARP member. I use that discount every chance I can!!!
Not my best/tidiest solder work but the 6.3 VAC tube filament wiring is done. I really hate the stranded 20 AWG junk brown wire that I used. Never again!
I’m using this on the vac tube tester. Bit stiff but seems like decent wire. Says silver coated, figure it’s tinned, regardless, still have to be mindful of errant strands.
I should have used something way better like that. I probably only needed 3 feet.




