Dating jensen speakers
This also was the first amplifier made by Fender specifically for the bass guitar. The principal external difference was the placement of the model name of the amp on the front logo-plate.(Fender produced the first electric bass, the Precision Bass, in 1951 and it needed an amp.) No tube chart or Fender serial number can be found on this amp, though the control pots date it to 1952. This amp, made in late 1953, is one of the first wide-panel tweed amps. All Fender amps up to this point had a metal plate mounted on the front top panel simply stating “Fender.” The logo plate on this amp designates it as a “Fender Deluxe.” The naming of the Fender amp model on the front panel continues to this day. Now we are getting into the Fender Ivy League of amps. Though the amps are rated to handle the same output wattage, the Jensen “Q” speaker is rated slightly more heavy-duty than the “R” speaker.
The mohair grille cloth is less worn than the linen cloth of the Pro. This amp has been recovered in tweed and fitted with a later-era woven grille.
It is notable for its construction which was unique to this early model Bassman (1952-54).
“N” was the highest-rated guitar amp speaker for 10” and above; “R” the lowest.
The ratings were lower still (T, U, V, etc.) for 6”, 8”, PA and other small or light-use speakers.
I have included the date code (where available) following the description of each amp below.1948 Dual Professional Super Amp.
This amp has been restored with new professional re-tweed of the cabinet, new mohair grille cloth and metal “V” frontpiece, while retaining the original electronics and tubes.The “TV” front was altered to “wide-screen” shape, with the grille extending horizontally all the way across the front of the amp and equal-sized panels on front top and bottom. Ironic that the Harvard and the Princeton were a bit down-market from their more generically-named older brothers, the Deluxe and the Pro. Unlike almost all the other tweed amp models, the Harvard exists only in its tweed version; it did not graduate to brownface status. The Princeton amp in its tweed version is kind of a fake-out.This amp has its original 15” Jensen P15N Bluebell speaker and its original 6SC7 preamp tubes. This wide-panel tweed amp has a 12” Jensen P12R bluebell speaker. Perhaps the Ivy names were designed to appeal to the “advanced” student player. I couldn’t decide which one to include, so they both made the grade. The cabinet is nearly as large as that of a Deluxe, though it only has an Oxford 8” speaker and is a low-powered 5 watts, same as the Champ.It has four inputs, two each for the instrument and microphone channels, with two volume controls.The capacitors are original and the preamp tubes are the old metal 6SC7 tubes, which would be replaced in the early ‘50s by the glass 12AX7 – type vacuum tubes. This amp is constructed much the same as the Pro, with TV front and a single 12” Jensen Alnico bluebell speaker.Tweed amps can be placed in three general categories by the styling of the front of the amp: “TV”, “wide-panel” and “narrow-panel” tweed.