Found a Champ for five bucks at a garage sale that was pretty beat up. I did a complete cap job, put in a JJ 6V6 and a Jensen P8R. This amp now sounds fantastic.
P8R
General Characteristics:
| Nominal Overall Diameter | 207 mm | 8 in |
| Nominal Voice Coil Diameter | 25 mm | 1 in |
| Magnet Weight | 200 g | 7.0 oz |
| Overall Weight | 2.65 lbs | |
| Flux Density | .96 T |
Thiele-Small Parameters:
| Voice Coil DC Resistance | RE | 6.70 Ω |
| Resonance Frequency | ƒS | 130 Hz |
| Mechanical Q Factor | QMS | 9.18 |
| Electrical Q Factor | QES | 2.30 |
| Total Q Factor | QTS | 1.84 |
| Mechanical Moving Mass | MMS | 9.3 g |
| Mechanical Compliance | CMS | 161 µm/N |
| Force Factor | BxL | 4.72 Wb/m |
| Equivalent Acoustic Volume | VAS | 10.3 lt. |
| Maximum Linear Displacement | XMAX | 1.0 mm |
| Reference Efficiency | nO | 0.95 % |
| Diaphragm Area | SD | 213.8 cm2 |
| Losses Electrical Resistance | RES | 27 Ω |
| Voice Coil Inductance @ 1kHz | LE | 0.36 mH |
Constructive Characteristics:
| Magnet | AlNiCo |
| Voice Coil Winding | Copper |
| Voice Coil Former | Epotex |
| Cone | Paper |
| Surround | Integrated Paper |
| Dust Dome | Treated Cloth |
| Basket | Pressed Sheet Steel |
Electrical Characteristics:
| Nominal Impedance | 8 Ω |
| Rated Power | 25 W |
| Musical Power | 50 W |
| Sensitivity@1W,1m | 92.5 dB |
P8R
8", 25 watts, 4Ω/8Ω
Warm clean tone with emphasis on the highs. It responds to overdrive distortion with a warm and bright fuzz lead voice.
Sound Samples:
Specification Sheet:
Product Dimensions:
Frequency Response Chart:
User Reviews
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Ben in Indianapolis, IN
Picked up a White model 80 amp at a swapmeet, it had tubes in the wrong sockets and a junky no-name modern speaker. Didn't know quite what it was at the time, but figured anything made in Fullerton might have a Fender link. I replaced the filter caps (saving the old ones) and installed tubes from my NOS stash. The final touch was ordering a Jensen P8R speaker. It's a great-sounding amp for harp, lap steel, and my Oscar Schmidt electric dobro.
Walt in California