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FDP Forum / Fender Amps: Vintage (before 1985) / '69 Princeton Reverb rebuild - total fire damaged

BbendFender
Contributing Member
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American Patriot

I'm on guard these days.
Apr 17th, 2016 03:35 PM   Edit   Profile   Print Topic   Search Topic

A friend gave me a chassis from a '69 Princeton Reverb that was in a serious fire. The PT is totally gone but I have another good OT. Looks like most everything needs to be replaced
Where is the best place to get All resistors and capacitors? Tube sockets look ok but I have those on hand if needed.

Peegoo
Contributing Member
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Eat. Sleep. Guitar.

Repeat
Apr 17th, 2016 03:59 PM   Edit   Profile   Print Topic   Search Topic

Antique electronic supply (link above). That's where I get my stuff.

(This message was last edited by Peegoo at 06:00 PM, Apr 17th, 2016)

BbendFender
Contributing Member
*********

American Patriot

I'm on guard these days.
Apr 17th, 2016 05:05 PM   Edit   Profile   Print Topic   Search Topic

Thanks Peegoo. I have bought lots of stuff from them. Now, how about a list of stuff without going item by item from a schematic?


BbendFender
Contributing Member
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American Patriot

I'm on guard these days.
Apr 19th, 2016 09:10 AM   Edit   Profile   Print Topic   Search Topic

I ordered a "kit" from Mojotone. I already have the transformers and all I need is the board, resistors and capacitors. This will be my first attempt to rebuild something like this.

guitarcapo

U.S.A.

Apr 19th, 2016 10:14 PM   Edit   Profile   Print Topic   Search Topic

the cab survived but the board didn't?

BbendFender
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American Patriot

I'm on guard these days.
Apr 20th, 2016 08:44 AM   Edit   Profile   Print Topic   Search Topic

No, the cab was toast. I built a new cab from old pine. If I am successful with this, it won't be the same amp. Mostly all new parts so bye bye '69 Princeton Rev.

guitarcapo

U.S.A.

Apr 21st, 2016 01:42 PM   Edit   Profile   Print Topic   Search Topic

So what exactly is original? I'm thinking if you are replacing the cab, sockets, transformers, and all the internal electronics...at that point all that might be original is the chassis you are stuffing it all into....and if that's the case I'm wondering if a scratch kit build isn't a simpler, cleaner endeavor.

I mean unless the chassis is still in good shape.

BbendFender
Contributing Member
*********

American Patriot

I'm on guard these days.
Apr 21st, 2016 02:58 PM   Edit   Profile   Print Topic   Search Topic

Chassis is still in good shape. I don't know why I am doing this because I have 2 other SFPR's. I just want to do it. I'm retired and I have lots of time now. Could be a little pricey because I'll need a new faceplate. One step at a time. My parts should be here any day now.

guitarcapo

U.S.A.

Apr 23rd, 2016 01:16 PM   Edit   Profile   Print Topic   Search Topic

Have you broken the price of ordering all those separate parts vs. Buyingba kit and just selling the redundant extra components on EBay (I'm assuming one chassis and one transformer)

Not telling you how to spend your free time but it seems cheaper and easier.

BbendFender
Contributing Member
*********

American Patriot

I'm on guard these days.
Apr 23rd, 2016 03:13 PM   Edit   Profile   Print Topic   Search Topic

Good idea guitarcapo. I really don't need another Princeton Reverb since I already have 2. The old burned chassis might be inviting to some.

BbendFender
Contributing Member
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American Patriot

I'm on guard these days.
May 7th, 2016 05:05 PM   Edit   Profile   Print Topic   Search Topic

Well, I don't know why I waited this long but I tested the PT and OT and both are still in good shape. Voltages are normal for a PR PT.
I wired the circuit board I got from Mojo but I have a problem with one resistor getting smokin' hot. I have checked and rechecked my work and cannot find the problem. Off to my tech it will go when he finishes working on another PR of mine.

BbendFender
Contributing Member
*********

American Patriot

I'm on guard these days.
May 10th, 2016 10:31 AM   Edit   Profile   Print Topic   Search Topic

Question? I did order a kit for this Princeton Reverb but I have since retested all of the resistors and capacitors on the original board and a bunch of them are still well within tolerance, or right at spec. I also tested the PT and OT and both are still good. They didn't look good when I first got the chassis but I cleaned them up. Apparently, most of the damage to the inside of the chassis was mostly smoke damage with some heat damage.
Should I just use the original turret board and transformers in rebuilding this amp? I have already built a cabinet and covered it with some old Fender tolex that I have salvaged.
Still checking and rechecking all of my work and it looks good according to the schematic and comparing it to my other Princeton Rev.

(This message was last edited by BbendFender at 12:32 PM, May 10th, 2016)

Hammond101
Contributing Member
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So. Cal. USA

May 10th, 2016 11:06 AM   Edit   Profile   Print Topic   Search Topic

Bbend, can you send/post a photo of the resistor that is overheating?

Have you done any voltage checks after the install of the new eyelet board?

This sounds like a possible issue with an error in the filter/rectifier/power supply area or related wiring.

It's hard to say what the long term effect of the heat stress on that main board is. I'd make sure any components handling high DC voltage are replaced. Grid/plate resistors, slopes etc.

I did a '53 Pro that had been blown up (literally) twice. I was able to save the board itself and the tone caps. Everything else was replaced. Too bad actually because if the first failure was properly repaired the second would have never happened.

BbendFender
Contributing Member
*********

American Patriot

I'm on guard these days.
May 10th, 2016 01:01 PM   Edit   Profile   Print Topic   Search Topic

Hammond, I fixed that hot resistor problem. I just had one wire in the wrong place.
I have "blueprinted" the board several times and I think I have everything as it should be. I also have a '73 Princeton Reverb that I use also for comparison.
At present I am working on the original board. Several things have been replaced but several resistors test spot on or very close to the correct values. I just wonder if putting the original board back in the amp, along with the original transformers would be the best thing to do. Since the cabinet is toast, no other options but to build a new one.
This is a fun project but I'm getting ready for a working amp to come out the other end.

FDP Forum / Fender Amps: Vintage (before 1985) / '69 Princeton Reverb rebuild - total fire damaged




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