Hi Patrick, I like the pictures of the old family, it brings back memories. these old amps are a nice place to start for a novice. when you were measuring the power, you didn't show the scope picture so we could see any clipping. that is what I look for when repairing an amplifier, that would be nice to see. Good luck Rich
Nice to see a repair/service video without the inane and pointless introduction of some dog or other animal that has nothing to do with fixing amps. *never understood why people do that. The quick (thank you for quick) throwback to relative history - somewhat connected to the point of the video. Oh, and I didn't need to speed up, nor slow down the playback speed to watch comfortably. - No animals were harmed or needed in the making of this video. Thank you for that. 🙂 Have fun!
You have a nice shop! I have noticed the Jupiters seem sensitive to heat. I had some fail in a poorly ventilated amp. My bad for that! I learned my lesson on that one.
When this amp was built wall voltage was was 115 to 117 volts. Nowadays its about 122 volts. The B+ voltage could then be 15 to 20 volts higher. 470 ohms will bias that tube too hot so it makes sense to put in 600 or 680 ohms for that cathode resistor. Cool video!
At 3:50, isn't that the wrong input scenario.? It looks like using #1 puts the guitar in // with #2 That makes the grid stopper 34k and not 68k................I could be wrong 🙂
I didn't get a chance to do that due to the time crunch. My Friend Fazio Electric has a Champ video with a good description of biasing a champ. czcams.com/video/FxF7DnQf1mg/video.html
Uncle Doug was the first Amp Tech I saw using the old paper for the new caps and I think it really makes the amp remain vintage looking Great Job Pat
Hi Patrick, I like the pictures of the old family, it brings back memories. these old amps are a nice place to start for a novice.
when you were measuring the power, you didn't show the scope picture so we could see any clipping. that is what I look for when repairing an amplifier, that would be nice to see.
Good luck Rich
Big fan of Jupiter caps as well! Great repair video man!
Nice to see a repair/service video without the inane and pointless introduction of some dog or other animal that has nothing to do with fixing amps. *never understood why people do that. The quick (thank you for quick) throwback to relative history - somewhat connected to the point of the video. Oh, and I didn't need to speed up, nor slow down the playback speed to watch comfortably.
- No animals were harmed or needed in the making of this video.
Thank you for that. 🙂
Have fun!
Thanks for the video! Sorry to hear about your Cutlass.
You have a nice shop! I have noticed the Jupiters seem sensitive to heat. I had some fail in a poorly ventilated amp. My bad for that! I learned my lesson on that one.
When this amp was built wall voltage was was 115 to 117 volts. Nowadays its about 122 volts. The B+ voltage could then be 15 to 20 volts higher. 470 ohms will bias that tube too hot so it makes sense to put in 600 or 680 ohms for that cathode resistor. Cool video!
i retubed a 1959 tweed deluxe with vintage mullards and it sounded great.
Such an awesome look into this amp!! 🌟
Love the Bang music in the background
Awesome vid Pat, Thank you!
At 3:50, isn't that the wrong input scenario.?
It looks like using #1 puts the guitar in // with #2
That makes the grid stopper 34k and not 68k................I could be wrong 🙂
Was that “Dirty Boulevard” off Lou Reed’s “New York” album for the tone test?
it is!
This is so great. How about a quick math lesson on how to calculate the correct value for a cathode bias resistor?
I didn't get a chance to do that due to the time crunch. My Friend Fazio Electric has a Champ video with a good description of biasing a champ. czcams.com/video/FxF7DnQf1mg/video.html
I'm. Here