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Post subject: '68 Princeton Reverb NAD
Posted: Sat Jun 21, 2014 1:47 pm
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Just found a player '68 Princeton Reverb. smells like it's been in a bar for the last 40+ years!

not sure if this was a drip edge or not. seems like it should have been, but edges are long gone. I have a question on the Oxford speaker. It looks like it is dated 37th week of 1965. is that common for Leo to have them laying around that long? Also, does anyone know what the number "1" means after the model # (10L5-"1"). I've seen others that have "2" or "3".

I'll post some more pics when I get it opened up

Image
Image


Last edited by CosmoB on Sun Jun 22, 2014 8:07 am, edited 3 times in total.

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Post subject: Re: '68 Princeton Reverb NAD
Posted: Sat Jun 21, 2014 2:24 pm
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CosmoB...nice find. Yeah it should have had drip edge molding, pretty uncommon to see a black line that doesn't.

If you very carefully remove the speaker, then the baffle, and lastly the staples that hold the grill cloth on, you can spray it down with windex and very, very carefully rinse the cloth. Let it dry and then remount it and you can get it pretty clean. I have done this on a couple of Bantam Bass amps I refurbed.

As for the Oxford, I am sure Retroverbial (our resident Oxford Speaker Guru) who will be by in a while can tell you what the "1" means, but that could very well be a later replacement speaker since the numbers restart every decade as they certainly didn't sit around the factory that long. And Leo was on again off again with some of his speaker companies due to pricing and power handling issues.

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Post subject: Re: '68 Princeton Reverb NAD
Posted: Sat Jun 21, 2014 5:02 pm
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The Oxford 10L5 is commonly seen in the Super Reverb and Vibrolux Reverb. The standard factory driver for a Princeton Reverb would've been the 10J5. Thus by both sub-type and date, your speaker is definitely a replacement. As a '68 model, the amp was built with drip-edge trim, silver/black/blue grill cloth, black-line front panel, and snowman knobs. Early '69 versions featured similar cosmetics but with silver/white/turquoise cloth and standard control knobs. New grill cloth and repro drip-edge molding would be a worthwhile endeavor for such a find.

Arjay

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Post subject: Re: '68 Princeton Reverb NAD
Posted: Sat Jun 21, 2014 5:35 pm
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more pics

Image

Image

Image


Last edited by CosmoB on Sun Jun 22, 2014 8:09 am, edited 1 time in total.

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Post subject: Re: '68 Princeton Reverb NAD
Posted: Sat Jun 21, 2014 5:42 pm
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Quote:
New grill cloth and repro drip-edge molding would be a worthwhile endeavor for such a find.


It seems that since Fender is doing the '68 reissue, that they would sell the drip edge and grill cloth as replacement parts but I have had no luck thus far. Any thoughts?

Still curious as to what that "1" code is. Have not been able to find a reference to it with trusty google.


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Post subject: Re: '68 Princeton Reverb NAD
Posted: Sat Jun 21, 2014 6:05 pm
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CosmoB wrote:
Quote:
New grill cloth and repro drip-edge molding would be a worthwhile endeavor for such a find.


It seems that since Fender is doing the '68 reissue, that they would sell the drip edge and grill cloth as replacement parts but I have had no luck thus far. Any thoughts?

Still curious as to what that "1" code is. Have not been able to find a reference to it with trusty google.


The grill cloth while not exact, something pretty close is available...
http://www.mojotone.com/amp-parts/ampli ... 6YrTGdOUcA

However, the drip edge molding has evaded us all here on the forum. But I TOTALLY agree with you that Fender should be offering this "Part" for refurbishing amps.

T2

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Post subject: Re: '68 Princeton Reverb NAD
Posted: Sat Jun 21, 2014 6:19 pm
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Drip-edge molding is available if you know where to look......

Image

(think "Ebay")

So is the correct silverface grill cloth (if you know who to ask).

Your amp's cap can dates to the 9th week of '68, well past due for replacement.

Arjay

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Post subject: Re: '68 Princeton Reverb NAD
Posted: Sat Jun 21, 2014 6:29 pm
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Arjay....you mean this one?
http://www.ebay.com/itm/Fender-Amplifie ... 3cdff10385

Now where do you get the corners? Or are you manufacturing your own corners?

T2

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Post subject: Re: '68 Princeton Reverb NAD
Posted: Sat Jun 21, 2014 6:42 pm
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Corners must be "harvested" from an existing vintage cabinet. Or install the repro molding via a mitered fit as seen in that listing's photo. A chop-saw would be required for accurate 45-degree bevels.

Arjay

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Post subject: Re: '68 Princeton Reverb NAD
Posted: Sat Jun 21, 2014 8:54 pm
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I've seen the guy on ebay selling the material. it looks like it comes from a dealer in SoCal. I may run over there and see it in person. Arjay- can you tell me a good source for the period correct grill cloth? As far as the cap can, would that eliminate the standby hum? Is there any reason not to replace it?

Thanks


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Post subject: Re: '68 Princeton Reverb NAD
Posted: Sat Jun 21, 2014 10:07 pm
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I'd replace the cap can. I like the 20/20/20 at 525VDC can available from AES. The extra electrolytic fluid in the 525VDC rated can will help insure longer life. Volume of this fluid is important for cap can heat dissipation.


http://www.tubesandmore.com/products/C-EC20X3-525


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Post subject: Re: '68 Princeton Reverb NAD
Posted: Sat Jun 21, 2014 11:26 pm
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It's a Princeton Reverb, Steve.

He needs this cap can......

http://www.tubesandmore.com/products/C-EC40-20X3-525

Arjay

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Post subject: Re: '68 Princeton Reverb NAD
Posted: Fri Mar 20, 2015 5:50 pm
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I finally picked up the new cap can. Other than getting a big soldering iron to remove the old one (after draining) is there anything special I need to do (Rebias or whatever)?


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Post subject: Re: '68 Princeton Reverb NAD
Posted: Fri Mar 20, 2015 10:53 pm
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The Princeton Reverb has a fixed-bias supply. Absent any issues with your power-rail resistors, there's really not much to be done after re-capping. You should check voltages at the power-tube plates to ascertain that they're within the operating parameters and measure the bias-supply voltage (tremolo circuit disengaged via the foot switch or shorting plug). Be sure to drain all electrolytic caps before proceeding with the repairs.

Arjay

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Post subject: Re: '68 Princeton Reverb NAD
Posted: Mon Mar 23, 2015 7:52 pm
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Arjay,

I just noticed that the old cap can is slightly different.

20/20/20/20uF 475VDC

I bought the 40/20/20/20uF 525VDC.

Is there any harm in using it or should I return?

Thanks


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