SF Princeton Reverb questions from a dummy !

hedzup · September 5th, 2003, 07:06 AM

I don't know much about electronics - so I need some advice. I have a real nice Princeton Reverb SF. On the back it says Total load 8 ohms. The spkr says 8 ohms. I have an 8 ohm ext cabinet. Does that mean I need to unplug the interneal spkr before I plug in the ext cabinat - or can they run together?

Also - when I got it - I turned it on and it immediately blew the fuse. I investigated and found the rectifier tube had the little black part that lines it up in the tube socket was broken off and missing. Could the tube pins being not lined up right have caused the fuse to blow?

Thanks guys!

Dacious · September 5th, 2003, 07:46 AM

Absolutely, yes and yes.It would be wise to check the rectifier carefully before plugging in again. You should be able to pick where the notch goes. In fact, they are comparatively cheap - treat it to a new one. Hopefully your power tranny will be OK.

Tremo · September 5th, 2003, 01:44 PM

In an effort to determine if the PT is damaged, remove the rectifier tube completely, and turn on the amp. If the fuse blows again, you have problems. If the fuse does not blow, check to see that the pilot light and all the tube filaments light up.

Octal based tubes with broken-off index pins are problems waiting to happen. I'd recommend that you replace the rectifier. Also, that amp is due for a cap job, if it hasn't already had one.

Bluedawg · September 5th, 2003, 10:54 PM

Someone once told me(it might have been Tremo)that if you blow a fuse,replace it,if it blows again,time for a cap job.

Ringo · September 5th, 2003, 11:09 PM

You may want to check into the Weber copper caps, they are a ss plug in rectifier that sounds like a tube rectifier, I'm getting ready to order some from Weber VST for my SF PR and DR.
They are inexpensive and should last forever, and are supposed to be better for your amp too.
I've never tried running an ext cab from my PR with the internal speaker, I did run into a 8 ohm Carvin Legacy 2 x12 cab and the amp sounded GREAT!!!!
Some folks don't recommend running an ext cab with the internal speaker for the PR / Deluxe Reverb, but most Fender amps are very tolerant of impedance mismatches, this is a question best asked of a good amp tech, like Big Cookie who posts here and or some of the techs who hand out on the Weber BB's.

hedzup · September 6th, 2003, 06:42 AM

Thanks guys. I bought a new rectifier tube and fuses, plugged them in - and the amp works great. And what an awesome tone!! This is my first PR - and it just may be exactly what I have been looking for !!!!!

jazzguitar · September 6th, 2003, 11:50 AM

Great amps!

Congratulations. Just try a good speaker (if the amp has the original one) a Jensen reissue or Weber speaker will show you what that amp really is capable of ...

EMan · September 6th, 2003, 12:24 PM

I've been running EXT cabs on my Princeton for decades. Keep it to an 8 ohm cab and get after it.

My present config is a Weber P12N in the amp...and another P12N in a cab. Giving these amps a "big mouth" will make one hell of a difference!

September 5th, 2003, 07:06 AM	#1 (permalink)
hedzup TDPRI Member Join Date: May 2003 Posts: 28	SF Princeton Reverb questions from a dummy ! I don't know much about electronics - so I need some advice. I have a real nice Princeton Reverb SF. On the back it says Total load 8 ohms. The spkr says 8 ohms. I have an 8 ohm ext cabinet. Does that mean I need to unplug the interneal spkr before I plug in the ext cabinat - or can they run together? Also - when I got it - I turned it on and it immediately blew the fuse. I investigated and found the rectifier tube had the little black part that lines it up in the tube socket was broken off and missing. Could the tube pins being not lined up right have caused the fuse to blow? Thanks guys!

September 5th, 2003, 07:46 AM	#2 (permalink)
Dacious Friend of Leo's Join Date: Mar 2003 Location: Godzone Posts: 2,611 35 Photos	Absolutely, yes and yes.It would be wise to check the rectifier carefully before plugging in again. You should be able to pick where the notch goes. In fact, they are comparatively cheap - treat it to a new one. Hopefully your power tranny will be OK. __________________ My other Telecaster is a Thinline The Tele Bible, Ch 1, v 10 Love thy Telecaster, covet not thy neighbour's Strat!

September 5th, 2003, 10:54 PM	#4 (permalink)
Bluedawg Tele-Meister Join Date: Apr 2003 Location: Mid-Atlantic,US Posts: 196	Someone once told me(it might have been Tremo)that if you blow a fuse,replace it,if it blows again,time for a cap job. __________________ Boom,Boom,Boom,Boom -J.L. Hooker

September 5th, 2003, 11:09 PM	#5 (permalink)
Ringo Tele-Afflicted Join Date: Mar 2003 Location: Memphis TN Posts: 1,905	re PR You may want to check into the Weber copper caps, they are a ss plug in rectifier that sounds like a tube rectifier, I'm getting ready to order some from Weber VST for my SF PR and DR. They are inexpensive and should last forever, and are supposed to be better for your amp too. I've never tried running an ext cab from my PR with the internal speaker, I did run into a 8 ohm Carvin Legacy 2 x12 cab and the amp sounded GREAT!!!! Some folks don't recommend running an ext cab with the internal speaker for the PR / Deluxe Reverb, but most Fender amps are very tolerant of impedance mismatches, this is a question best asked of a good amp tech, like Big Cookie who posts here and or some of the techs who hand out on the Weber BB's.

September 6th, 2003, 11:50 AM	#7 (permalink)
jazzguitar Tele-Meister Join Date: Mar 2003 Location: Germany Posts: 280	Another vote for the Princeton Great amps! Congratulations. Just try a good speaker (if the amp has the original one) a Jensen reissue or Weber speaker will show you what that amp really is capable of ...

September 5th, 2003, 01:44 PM	#3 (permalink)
Tremo Friend of Leo's Join Date: Mar 2003 Location: Silicon Valley, CA, USA Posts: 3,643	In an effort to determine if the PT is damaged, remove the rectifier tube completely, and turn on the amp. If the fuse blows again, you have problems. If the fuse does not blow, check to see that the pilot light and all the tube filaments light up. Octal based tubes with broken-off index pins are problems waiting to happen. I'd recommend that you replace the rectifier. Also, that amp is due for a cap job, if it hasn't already had one.

September 6th, 2003, 06:42 AM	#6 (permalink)
hedzup TDPRI Member Join Date: May 2003 Posts: 28	Thanks guys. I bought a new rectifier tube and fuses, plugged them in - and the amp works great. And what an awesome tone!! This is my first PR - and it just may be exactly what I have been looking for !!!!!

September 6th, 2003, 12:24 PM	#8 (permalink)
EMan Tele-Holic Join Date: Apr 2003 Location: Dallas, Texas Posts: 939	I've been running EXT cabs on my Princeton for decades. Keep it to an 8 ohm cab and get after it. My present config is a Weber P12N in the amp...and another P12N in a cab. Giving these amps a "big mouth" will make one hell of a difference!