"16 to 25 ohm" is a larger range than the 10V difference in bulb voltage. In any case, it takes 288W from the 121V source. We'll test it in circuit and see what I get. I can always trim it by strapping a 100R across it or something.
Where I come from fugly is a portmanteau of "F**king ugly"... Never heard someone say it as a compliment before...
You have to hang around here and read Zen Mod for awhile. Everything normal goes out the window!!!
Lesson in topography, you can't have it all!
I love my De-Lite so much I decided to fashion a proper chassis for it so that it may reside in the living room with the wifey, teenage girls, and the dogs. Many hours were spent as my carpentry is rusty at best. When I turned it on beautiful music sprang forth but there it was...Humm! A buzz I just can't ignore. And this buzz was not present in my first super sloppy build. I now get why so many go on about the importance of topography. Trying to cram these giant capacitors, a giant transformer, and mosfets that will amplify signal noise into this small of a space is just a disaster. There's no room for clean wiring the AC and DC are way too close together and it was such a struggle to tighten each screw. PITA!
So back to the drawing board with more space.
As a side note I also learned its best to read the description when buying parts. AC & DC panel voltmeters are not the same.
P.S. I don't have the heart to dismantle it just yet it's currently playing some very soothing Aimee Mann
I love my De-Lite so much I decided to fashion a proper chassis for it so that it may reside in the living room with the wifey, teenage girls, and the dogs. Many hours were spent as my carpentry is rusty at best. When I turned it on beautiful music sprang forth but there it was...Humm! A buzz I just can't ignore. And this buzz was not present in my first super sloppy build. I now get why so many go on about the importance of topography. Trying to cram these giant capacitors, a giant transformer, and mosfets that will amplify signal noise into this small of a space is just a disaster. There's no room for clean wiring the AC and DC are way too close together and it was such a struggle to tighten each screw. PITA!
So back to the drawing board with more space.
As a side note I also learned its best to read the description when buying parts. AC & DC panel voltmeters are not the same.
P.S. I don't have the heart to dismantle it just yet it's currently playing some very soothing Aimee Mann
Attachments
I guess you're sure it's not just a grounding issue?
I hate hum, so if there's a lot of it, I'll feed into the cathode of the first tube to cancel it.
I hate hum, so if there's a lot of it, I'll feed into the cathode of the first tube to cancel it.
I love an amp with all the connectors on the front face. I don't understand why commercial amps have connectors on the back! 😀
A quick shot of some of the back of my rack will tell you why 😀
It's a Zen-Mod'ism which translates to words of high praise.
Great job!
Thanks! Ya I get it now 🙂 I might turn the chassis black and leave the heatsink as it is. Then it'd be really fugly 😀
Attachments
Last edited:
So the sockets arrive today and I'll be able to see how it works.
I am expecting hum since it's SE and unregulated, but I've added what I think will be a Hum adjustment. What do you think? I feel like it's a blend of Aikido and Janus. 1k might be off for the pot but I won't know until it's alive.
I also added a safety diode for the tube.
I am expecting hum since it's SE and unregulated, but I've added what I think will be a Hum adjustment. What do you think? I feel like it's a blend of Aikido and Janus. 1k might be off for the pot but I won't know until it's alive.
I also added a safety diode for the tube.
Attachments
Last edited:
For what it's worth the panel with the voltmeters and the connectors was intended to be the back panel. I put the meters in to be able to adjust the drain to ground voltage without having to connect a DMM. Where I live the temperature swings quite dramatically affecting the drain to ground voltage. I have found that Papa's suggestion of 25V is sonically on point. I tried many other voltages and none were better, some noticably worse.
Jeffrey
Jeffrey
Hey Jeffrey,
I hope you have this hum issue solved soon. Aimee Mann demands to be played
through a quiet amp. 🙂
Cheers,
Dennis
I hope you have this hum issue solved soon. Aimee Mann demands to be played
through a quiet amp. 🙂
Cheers,
Dennis
Hi Dennis,
Indeed Aimee Mann is for quiet amplifiers. The Magnolia Sountrack is one of my "test" records. On the first build of this amp I had the wifey sit and listen to it. Eyes closed nearfield listening and she said-without prompting: "Wow it's like she's in the room singing just for me."
Jeffrey
Indeed Aimee Mann is for quiet amplifiers. The Magnolia Sountrack is one of my "test" records. On the first build of this amp I had the wifey sit and listen to it. Eyes closed nearfield listening and she said-without prompting: "Wow it's like she's in the room singing just for me."
Jeffrey
Ok. After realizing I was using different MOSFETs, I rigged up a bias control. I also ordered 500W light bulbs.
But I'm listening to feedback free single ended MOSFETs and I'm in disbelief that these are this linear without help!
Not sure how hot I want the heat sink to get but it's already in the 65c area...
There's a 6 in 4 out speaker switch etc there 🙂
But I'm listening to feedback free single ended MOSFETs and I'm in disbelief that these are this linear without help!
Not sure how hot I want the heat sink to get but it's already in the 65c area...
There's a 6 in 4 out speaker switch etc there 🙂
