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SurfGuitar101 Forums » Gear »

Permalink Princeton Amp Problems - Please Help!

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I'm late on the bandwagon here, but it looks great!

Frustrated, amp is shorting out. Totally unplayable. Sounds like something is rattling around inside as well. I think it’s those two metal washers. I don’t want to get electrocuted like I did Saturday when I touched that electric fence. I’ll have to take it to the tech. Great guy but usually has amp for 7 weeks or so. Anyway, I just had to vent...
PS: Just uploaded a video, could it be a blown speaker?
image
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MooreLoud.com - A tribute to Dick Dale. New EP Louder Than Life available on bandcamp and website. Taking guitar lessons from Jimmy Dale.

Last edited: Jul 03, 2018 23:44:05

If someone could please take a listen to the video, I would greatly appreciate it. I am really hoping it is just a blown speaker.

MooreLoud.com - A tribute to Dick Dale. New EP Louder Than Life available on bandcamp and website. Taking guitar lessons from Jimmy Dale.

Did you take the washers out? It looks like one was makaing cntact between the chassis and the tip (hot signal) of one of the input jacks - that could definitely cause some problems.

I listened and it doesn't really seem like a blown speaker to me - the buzz keeps going on long after the guitar note fades, which seems like the amp is generating some signal on its own.

I was afraid of that. Yes, I removed the washers. I will take it into the tech on Monday. He does great work but he will have it close to two months. Thank you for the analysis, Edward.

MooreLoud.com - A tribute to Dick Dale. New EP Louder Than Life available on bandcamp and website. Taking guitar lessons from Jimmy Dale.

Yeah that racket could have a number of causes. If you lived closer I'd be happy to take a look. Hope it's fixed soon.

Thanks Rocker, I wish you lived closer also. None

MooreLoud.com - A tribute to Dick Dale. New EP Louder Than Life available on bandcamp and website. Taking guitar lessons from Jimmy Dale.

Hey SixStringer, Be glad you don't live near me because it's supposed to be 110 degrees this weekend!!! Happy 4th Big Grin
It sure sounds like a blown speaker to me. Or maybe something else vibrating in the cabinet. That's easy to check..If you have access to another amp, cabinet, speaker hook them up and do some testing. Or, just remove the speaker to check for coil rub or damage to the cone, surround, or spider.
Is it the original speaker???

Last edited: Jul 04, 2018 19:23:00

Hi Ben, it is the original speaker. I hooked the Princeton up to a 1x12 extension cabinet and I heard some noise coming from both the Princeton and the extension cab. I thought it would only come out of the extension cab. Maybe I did something wrong, I am not very technical when it comes to this stuff. I do have a Bandmaster head but I don’t know how to connect it to the Princeton amp. By the way, at least you don’t have humidity. Ha! Take care man.

MooreLoud.com - A tribute to Dick Dale. New EP Louder Than Life available on bandcamp and website. Taking guitar lessons from Jimmy Dale.

Perfect...the cabinet will help. Did you disconnect the onboard speaker? Remove the onboard speaker jack from the "speaker" connection on the back of the Princeton (which completely isolates it) and plug the extension cabinet into the "speaker" socket on the Princeton. How does that sound?

Oops, I not only didn’t disconnect the speaker I plugged the ext cabinet into the other output jack in the back. I hope I didn’t damage anything! It was only for like 60 seconds. I’ll try what you said to do, thanks.

MooreLoud.com - A tribute to Dick Dale. New EP Louder Than Life available on bandcamp and website. Taking guitar lessons from Jimmy Dale.

Just did everything you told me to do, and the problem is still there. I can barely hear anything in the low gain slot with the volume all the way up, and I get an awful buzzing noise in the high gain slot. The volume is not very loud either way. Thanks for helping me eliminate a blown speaker.

MooreLoud.com - A tribute to Dick Dale. New EP Louder Than Life available on bandcamp and website. Taking guitar lessons from Jimmy Dale.

Bummer man...too bad it wasn't the washers. Good luck, let me know what you find out.

Did you try a tube swap with known good tubes?

He who dies with the most tubes... wins

Surf Daddies

Maybe also check to see if your input jack (the one that had the washer under it) has rotated so that the tip connector comes too close to the chassis, as well as checking that the leads on the black wire connecting the jacks to the rest of the amp circuit are not shorting on each other (they look rather exposed in the pictures and close together).

Maybe never mind about the wires I suggested looking at - I probably mistook braided shielding for bare wire. But have you recently had to tighten the input jack (number 2)? That could cause it to rotate and come in contact with the chassis. Those loose washers are the type that you would put on the jack or pots to keep them tight, so if they were just sitting there unused, it is likely that something is not as tight as it's supposed to be.

Thanks for all the help, guys. I am an idiot for not telling you that all of this started after I swapped the faceplace. The input jacks fell behind the chassis holes and I had to use needle nose pliers to get them out.I found a brand new faceplate that actually says Princeton on it! I don’t ask questions, but this guy has all kinds of Fender faceplates that were supposedly impossible to get. Anyway, I’ll take it to the tech on Monday.
image

MooreLoud.com - A tribute to Dick Dale. New EP Louder Than Life available on bandcamp and website. Taking guitar lessons from Jimmy Dale.

Last edited: Jul 05, 2018 10:03:53

I'd say go ahead and open it up again, put those washers in place and tighten the jacks back in the orientation they should be in (no. 2 needs to have the lug for the tip oriented at 9 o'clock, when you are looking at it from the back-check online for some other photos showing the orientation in similar amps). Given what you just noted, I bet that would solve your problem and save you a trip to the tech. Plus you could starting playing through it again.

Man I appreciate it but I am just too concerned about getting electrocuted or making things worse than they already are. I got electrocuted this past Saturday when I touched a fence (they didn't have a sign posted). Just about knocked me off my feet! Thanks for all your advice though. Smile

MooreLoud.com - A tribute to Dick Dale. New EP Louder Than Life available on bandcamp and website. Taking guitar lessons from Jimmy Dale.

SixStringSurfer wrote:

Thanks for all the help, guys. I am an idiot for not telling you that all of this started after I swapped the faceplace. The input jacks fell behind the chassis holes and I had to use needle nose pliers to get them out.

Ah, so the truth is coming out. Wink

Its an old rule of thumb with amps, that if the problem happened after you did the mod, it was because of something you did in the mod.

The absence of spring washers will be causing some of the problem no doubt - the input jacks (and other faceplate components) need to be securely attached to the chassis to ensure a good electrical connection to ground.

Also, you might have disturbed one of the input jack tip switch contacts when you reattached the jacks, in such a way that the tip switch isn't closing firmly with the tip contact, or you might have cracked a solder joint while re-attaching one of the jacks or pots etc, or you might have broken a pot lug contact etc etc.

He who dies with the most tubes... wins

Surf Daddies

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