At 16:40 deoxit is sprayed into the tube sockets. I'm not sure that is best practice. I think isopropyl alcohol is a better cleaning agent as it will 100% evaporates out. Those sockets remain glossy/shiny after the deoxit spray suggesting that something was left behind for perpetuity. Tube sockets should look clean and dry. Thanks for the video.
I dont know why I am watching this.I can barely change a light bulb. Anyways,I really liked your video.There is something calming watching people fix amps and set up guitars.More of these please 🙂
You are Dutch,i prepose(you sound Dutch). Great video and explination on working on this amp. Soon i get a friend over,to inspect his Fender Princeton reverb: it got serviced years ago,so maybe some capaciters are already replaced.It needs service on the pots(got scratchy) and check the tubes.Maybe the speaker is gonna replaced with a JBL E 110.
Ciao Aldo, Perfect video and very well explained process. Really appreciate it. I love my ´66 Princeton Reverb. By the way , the telecaster authority the Princeton is perfect . That is my set up , ciao e salute
Wonderful video I'm fixing a Princeton reverb right now the 1000 Ohm resistor by the center tap keeps melting well we'll see if I can fix it thanks again
By chance could you be so kind as to list the mfg and specs for the electrolytic capacitors that you replaced? Also, what the original rating for those components was on the unmodified setup?
The Can Is a 4x20uf, the bypass caps are all 25uf@25v on paper. I used 25uf@50v as they are more sturdy. The 1st bypass cap sees voltage on the high side of the rating so also a safety measure. Bias cap is 100uf I believe, the original rating is 50v but the voltage there is on/over the limit, so also safety measure. Hope that's clear, have fun and good luck, mate! Gr,
You could measure the voltage drop over the OT live, but use an alligator clip. Even with this multimeter, you would have gotten two decimals, which really matter... If the voltage drop was actually 4.4V dissipation per tube would be +11W. Great video still!
Hello Aldo. I'm not an amp repair guy but I found your video very interesting. I have not plugged in my 1970 Princeton Reverb in many years since it's not working correctly. The issue is very low volume that does not increase as I turn it up. I am the original owner and I am pretty sure it's never been serviced. I know I need to take it to a qualified repair shop but am just wondering if this issue indicates a likely cause? Thank you.
Ciao, by all means be careful, don't touch any of the electronics yourself before the filter capacitors are drained. Let's see, low volume can be caused by many things but if turning the the pot doesn't do anything, maybe the age and accumulated dirt in the amp grounds out the signal, either from the pot itself or the jack inputs. If there's sound the circuit still works. I would be interested in taking a look for you, but that would be complicated. Maybe look for a specialised tube amp tech, overhauling this amp makes it a great piece of gear. Good luck, regards,
well there has been some work done, in terms of ceramic caps. i dont think they had those back in the day :) but might be that they are not caps at all :) the discs i mean :)
Yo Joppe! Well, they did, those disc caps were already made before WWII I think. The ceramic disc caps in this amp are the original ones. These are 250pf as a treble cap and some 0,01uf's in the tremolo section. They are pretty sturdy survivors usually but one might replace them with Mica's or something like that.
Aldo Spadaro I’m hoping same to be true with the reissue, as I just got mine fedex. Ha ha ! Luckily I have the skills and know how to make it right, of it isn’t. Thank you for your kind response. ✨
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The demo at the end with the tele is awesome. Fantastic tone. My PR is just a bit older and is a lifetime amp for sure. Thank you!
At 16:40 deoxit is sprayed into the tube sockets. I'm not sure that is best practice. I think isopropyl alcohol is a better cleaning agent as it will 100% evaporates out. Those sockets remain glossy/shiny after the deoxit spray suggesting that something was left behind for perpetuity. Tube sockets should look clean and dry. Thanks for the video.
Great work and best explanation of biasing I’ve seen! Great playing as well!!
Great video man 🎉
Good job, glad you replaced those wonky sockets!
I dont know why I am watching this.I can barely change a light bulb.
Anyways,I really liked your video.There is something calming watching people fix amps and set up guitars.More of these please 🙂
Sounds real good .....sweet amp😊
You are Dutch,i prepose(you sound Dutch).
Great video and explination on working on this amp.
Soon i get a friend over,to inspect his Fender Princeton reverb: it got serviced years ago,so maybe some capaciters are already replaced.It needs service on the pots(got scratchy) and check the tubes.Maybe the speaker is gonna replaced with a JBL E 110.
Ciao Aldo,
Perfect video and very well explained process. Really appreciate it. I love my ´66 Princeton Reverb. By the way , the telecaster authority the Princeton is perfect . That is my set up , ciao e salute
Sounds unbelievable with that Telecaster
Sparkle 😊
Is what it does!
Sounds beautiful! Great job and thanks for explaining the details
Clear and concise, perfect video. Thanks for posting.
Is the volume knob turned down at all on the tele in the demo?
Hi Fin, It's a while back, I honestly don't remember. ;) Might be turned down on the amp but using amp's dynamics for cleans.
Very cool! Amazing tones man!
great job thanks !
Wonderful video I'm fixing a Princeton reverb right now the 1000 Ohm resistor by the center tap keeps melting well we'll see if I can fix it thanks again
yeah the green wire is a nice cold joint :) except for that nice!!! its amazing how simple they are.
By chance could you be so kind as to list the mfg and specs for the electrolytic capacitors that you replaced? Also, what the original rating for those components was on the unmodified setup?
The Can Is a 4x20uf, the bypass caps are all 25uf@25v on paper. I used 25uf@50v as they are more sturdy. The 1st bypass cap sees voltage on the high side of the rating so also a safety measure. Bias cap is 100uf I believe, the original rating is 50v but the voltage there is on/over the limit, so also safety measure. Hope that's clear, have fun and good luck, mate! Gr,
You could measure the voltage drop over the OT live, but use an alligator clip. Even with this multimeter, you would have gotten two decimals, which really matter... If the voltage drop was actually 4.4V dissipation per tube would be +11W. Great video still!
Hello Aldo. I'm not an amp repair guy but I found your video very interesting. I have not plugged in my 1970 Princeton Reverb in many years since it's not working correctly. The issue is very low volume that does not increase as I turn it up. I am the original owner and I am pretty sure it's never been serviced. I know I need to take it to a qualified repair shop but am just wondering if this issue indicates a likely cause? Thank you.
Ciao, by all means be careful, don't touch any of the electronics yourself before the filter capacitors are drained. Let's see, low volume can be caused by many things but if turning the the pot doesn't do anything, maybe the age and accumulated dirt in the amp grounds out the signal, either from the pot itself or the jack inputs. If there's sound the circuit still works. I would be interested in taking a look for you, but that would be complicated. Maybe look for a specialised tube amp tech, overhauling this amp makes it a great piece of gear. Good luck, regards,
@@AldoSpadaroOfficial Thank you for the comments/advice. I'm actually taking it in for repairs tomorrow. I'll post an update when I get it back.
well there has been some work done, in terms of ceramic caps. i dont think they had those back in the day :) but might be that they are not caps at all :) the discs i mean :)
Yo Joppe! Well, they did, those disc caps were already made before WWII I think. The ceramic disc caps in this amp are the original ones. These are 250pf as a treble cap and some 0,01uf's in the tremolo section. They are pretty sturdy survivors usually but one might replace them with Mica's or something like that.
An amp that sounds that good with speaker face down on a table is gonna work out just fine.
There's just something magic about a vintage Princeton amp. They just got it right!
Aldo Spadaro I’m hoping same to be true with the reissue, as I just got mine fedex. Ha ha ! Luckily I have the skills and know how to make it right, of it isn’t. Thank you for your kind response. ✨
@@BadChizzle Cheers, mate
@@BadChizzle I have a '73 Silverface Princeton and the '65 RI. I love them both but there is something magic about a dependable vintage amp.
looks like this amp survived a gunfight ;)
hihi or just short the caps if you want to get rid of them anyway ;) hehe
Let's do a capacitor blow-up party someday!