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Post subject: Princeton Reverb Reissue guts
Posted: Wed Jan 11, 2012 10:28 am
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Anyone have a photo of the inside of Princeton Reverb reissue chassis? I'm curious how it's put together. I know it's PCB (which is OK for me). But I'm wondering if the controls are board mounted or not.

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Post subject: Re: Princeton Reverb Reissue guts
Posted: Wed Jan 11, 2012 5:03 pm
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Look there;

http://support.fender.com/schematics/gu ... ematic.pdf

Pots are mounted on PCB


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Post subject: Re: Princeton Reverb Reissue guts
Posted: Wed Jan 11, 2012 5:38 pm
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stratele52 wrote:

Thanks for the link. It will be interesting to compare that schematic to the older originals. But I'm still curious about the physical implementation of the circuit.

I wander if a local music store would be willing to slide a chassis out. :)

Cheers,

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Post subject: Re: Princeton Reverb Reissue guts
Posted: Thu Jan 12, 2012 3:44 am
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mhowell wrote:
It will be interesting to compare that schematic to the older originals. But I'm still curious about the physical implementation of the circuit.
I wander if a local music store would be willing to slide a chassis out. :)
Cheers,
.

New princeton is PC board, original , older Priceton is point to point ; not the same, circuit have also big differences;
All pots are pc board mounting and most of the case, in pcb, those pots are low cost part ,if you look those in vintage Priceton.
I look the AA 1164 schematic, the original Princeton Reverb. Output tubes bias is a grid bias, reissu is a cathode bias. It is another beast.

And lots more difference too long to write. This doesn't mean your's don't sound good.

About the store ; forget it.


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Post subject: Re: Princeton Reverb Reissue guts
Posted: Thu Jan 12, 2012 4:19 am
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Here you go:


http://img.photobucket.com/albums/v687/ ... b_8297.jpg


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Post subject: Re: Princeton Reverb Reissue guts
Posted: Thu Jan 12, 2012 4:34 am
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You have always the good answer BMW202Ti


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Post subject: Re: Princeton Reverb Reissue guts
Posted: Thu Jan 12, 2012 8:40 am
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I knew someone on here would have it.

I'm surprised to see that the reissue has a bias adjust. Is that the pot mounted on the bottom of the chassis? That's actually nice feature (if used as it should be used).

Thanks,

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Post subject: Re: Princeton Reverb Reissue guts
Posted: Thu Jan 12, 2012 9:13 am
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stratele52 wrote:
mhowell wrote:
It will be interesting to compare that schematic to the older originals. But I'm still curious about the physical implementation of the circuit.
I wander if a local music store would be willing to slide a chassis out. :)
Cheers,
.

New princeton is PC board, original , older Priceton is point to point ; not the same, circuit have also big differences;
All pots are pc board mounting and most of the case, in pcb, those pots are low cost part ,if you look those in vintage Priceton.
I look the AA 1164 schematic, the original Princeton Reverb. Output tubes bias is a grid bias, reissu is a cathode bias. It is another beast.

And lots more difference too long to write. This doesn't mean your's don't sound good.

About the store ; forget it.


The preamp, phase inverter, and reverb circuitry appear to be almost identical to the original. The power amp and vibrato are definitely different and they've added a bias adjust.

The physical implementation is completely different as you've pointed out some of the detail. The heater wiring is borderline sloppy but the amp I checked out at Guitar Center wasn't humming so I guess it's OK. The heater wiring on the originals isn't any better so I guess that's one area where they stuck with tradition. :)

Thanks for the help.

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Post subject: Re: Princeton Reverb Reissue guts
Posted: Mon Jan 23, 2012 12:09 pm
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stratele52 wrote:
mhowell wrote:
It will be interesting to compare that schematic to the older originals. But I'm still curious about the physical implementation of the circuit.
I wander if a local music store would be willing to slide a chassis out. :)
Cheers,
.

New princeton is PC board, original , older Priceton is point to point ; not the same, circuit have also big differences;
All pots are pc board mounting and most of the case, in pcb, those pots are low cost part ,if you look those in vintage Priceton.
I look the AA 1164 schematic, the original Princeton Reverb. Output tubes bias is a grid bias, reissu is a cathode bias. It is another beast.

And lots more difference too long to write. This doesn't mean your's don't sound good.

About the store ; forget it.


The '65 Princeton Reverb Reissue IS NOT cathode biased. It is grid bias as the original amp. You may be confused by the addition of the cathode 1 ohm resistors which are there to allow measurement of the bias current and set it to our specification of 23mA for the 6V6 output tubes. The grid bias is about -40V as on the original AA1164 and is internally adjustable, something the AA1164 did not have. Also the power supply filter caps are of course not a combined "can style" and we used individual filter capacitors all 22 uF/500V.

The overall amp circuit is as close as possible to the AA1164 design as possible except for modern safety agency requirements. It is not, as pointed out, an eyelet board hard-wired implementation. The tubes are all chassis mounted and hand-wired over to the PCB. PCB mounted pots does not mean poor quality. The pots we use are not low cost and are high quality pots manufactured by Nobel.

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Post subject: Re: Princeton Reverb Reissue guts
Posted: Mon Jan 23, 2012 12:57 pm
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Howard - thanks for popping in.

PCB-mounted pots doesn't have to mean poor quality; the issue is in the quality of the parts and assembly. The classic reissues (Princeton, Deluxe, Super Reverbs) don't have the QC problems that other lesser amps seem to have. Not to mention any names or brands...

Great to have adjustable bias for changing tubes; wondering if the reissue responds in the same way to NOS; I am loving NAS Mazda's in both of mine as well as the Mullard CV4024 in the PI. As for filter caps vs. a can, as long as it does the same job, easier to get replacement parts for.

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Post subject: Re: Princeton Reverb Reissue guts
Posted: Mon Jan 23, 2012 2:49 pm
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You are right Howard , I'm so sorry .
R20 and R32 ; Fp1 , at 1 Watts can't be a cathode resistor .
You give to me a clear and good information,

Thank's


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