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Showing posts with label Fender Bassman. Show all posts
Showing posts with label Fender Bassman. Show all posts

Sunday, July 3, 2011

Tech Talk - Fender Bassman vs. Fender Bassman RI


First tube is preamp, 12AY7 is specified. 6072A may also be used. A low-noise, low-microphony 5751, 12AX7, or 7025 is also usable, though they will have more voltage gain and will change the sound of the amp considerably.

Second tube is a 12AX7. This is the driver. Any 12AX7 or 7025 is usable here--it need not be low-noise or low-hum, nor does it need to be tested for microphony.

Third tube is a 12AX7. This is the phase inverter tube. This tube need not be low-noise or low-hum, nor does it need to be tested for microphony. It must have good quality heater insulation. 12AX7s or 7025s are suitable. Good NOS 12AT7s may also be used here. We understand that some technicians recommend Ei or JJ ECC83s for this duty.

Power tubes are a pair of 6L6 (5881s were originally specified). Recommend using matched pair of 6L6GCs or NOS 6L6Gs, GAs, GBs, or WGB, or 5881s. Current TAD 6L6WGC-STR and re-issue Tung-Sol 5881 are the best option in place of NOS tubes. Also acceptable are NOS JAN-Philips 6L6WGB, and NOS types 7581A, KT66 or 350B. NOS metal 6L6s run too hot. DO NOT use other types.

Rectifier tube is type 83. This is a rare mercury-vapor rectifier. Only costly NOS is available. The similar type 83-V might work, although some technicians recommend against it. Warning: if an 83 rectifier is broken, there is a risk of mercury poisoning. tube 4 inputs Presence, Middle, Bass, Treble, Vol. Bright, Vol. Normal controls ground, power and standby switches


FModel/Circuit Number: 217-1000-010
Years of Production: 1990 – Present
Era: Vintage Reissue
Configuration: Combo
Controls: Chrome top facing w/ white screened labels, controls numbered 1-12
Knobs: Black Chicken Head
Faceplate

Front: Ground Sw, Fuse (3A), Power Sw, Standby Sw, Pilot Lamp, Presense, Mid, Bass, Treb, Vol Bright, Vol Normal, Bright Hi-Gain In, Bright Lo-Gain In, Normal Hi-Gain In, Normal Lo-Gain In

Speaker

* Size: 4x 10
* Impedance: 2 ohms
* Model: Jensen P10R(For more info, check out the Jensen Replacement Speakers)

Effects:
~Watts: 45 watts
Tubes

* Pre amp: 3 x 12AX7
* Power: 2 x 6L6GC

Bias: Fixed
Rectifier: Solid State plug-in (can be replaced with a 5AR4)
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