- #TUBE AMP DOCTOR BIAS MASTER MOD#
- #TUBE AMP DOCTOR BIAS MASTER FULL SIZE#
- #TUBE AMP DOCTOR BIAS MASTER MODS#
This amp has both channels run through the reverb circuit and uses bias vary The Ground Switch and AC Receptacle have been deleted. The Power switch switches both the mains hot and neutral lines. Left adds a soft start thermistor and Class X RFI noise cap to the mains line.Īrtificial 6.3v heater center tap resistors are connected to the pilot light atįar upper left. The V2B plate resistor (blue wire twisted with yellow plate power supply wire). The "Fender NormalĬhannel Reverb Mod" is the blue wire that runs from the V1B plate resistor to
Metal film resistors except the V3 2.2k cathode resistor. This is how Fender does a modern hand wired blackface amp. Only on the input end to prevent a ground loop.įender Modern Hand Wired Custom 64 Deluxe Reverb Input jack and volume output runs to the V1 and V2 grids. Silverface amps used shielded coax for the This is my personal AA1069 silverface Bandmaster The tremolo wires carryĪ very strong signal that can bleed into other signal wires so pay closeĪttention to their placement. Also notice how all the Tremolo wires are bundled and run along theĬhassis and then shoot straight down to their terminals. The Vibrato channel tone wires are wrapped and theĭoghouse A, B & C power wires are wrapped. Note the two wire bundles that are wrapped with a reddish
#TUBE AMP DOCTOR BIAS MASTER FULL SIZE#
Click on the image to see the full size layout. Model differences are highlighted in pink. Schematic & Annotated AB763 Layout Circuitĭeluxe Reverb Schematic and Layout AB763 Annotated SchematicĬlick the image for the full size schematic. Silverface Amp Make your Silverface amp sound right.īias Balance circuit to Adjustable Bias + Bias Balance How much you can do with simple preamp tube swaps. Power Tubes in a 4圆L6 Amp Cut your big amp's power by 65%. Tubes in a 4 Power Tube Amp Cut your output power almost in half. Output power, small bottle tone with more power tube distortion.Īmp A tone change with little power gain. Half Power Switch Kill two of your four power tubes at the flip of Receptacle With a 3-ProngUse modern accessories with the amp.Ī Band-Master Head into a Vibrolux, Tremolux, Pro, Concert orĬonvert a 65 Deluxe Reverb Reissue to a 68 Custom Deluxe Reverb
#TUBE AMP DOCTOR BIAS MASTER MOD#
Is your reverb tone too bright? This easy mod can tune the tone. OscillationSimple mod to clean up the reverb. Resistors Bright Cap Mod Get a little more brightness from either Pick Highs Take the edge off your tone with a single cap. To change the action of the reverb control? This is how. Preamp gain with this simple and very useful mod. Reverb's Loose Low EndMake it sound more like a Twin Reverb. Two identical tone stacks? Mod one of them. Presence Control Into Variable NFB Presence Control or Variable Use this late-in-the-circuit tone control to tame ice pick and tweak your tone. Pentode / Triode Switch Cut power tube output for lower volume In External Box External box goes between your amp and speaker to dump Iĭump 3/4 of the amp output for lower volumeġ0% Power Switch Dump 90% of the amp output for true bedroom level outputġ0% Power Jack Use your Aux jack as a 10% output jack Master volume AND late-in-the-circuit tone control. Simple Trainwreck Type-3 PPIMV master volume. Something constructive with your unused Normal channel.Īdd preamp gain with a simple resistor swapĪdd preamp clean headroom to the low voltage Deluxe, Deluxe Reverb, Vibrolux and ModApply reverb and tremolo to both channels the way Fender didĬhannels through the reverb and tremolo effects.
Note the Preamp Plate Voltage difference between theĭeluxe Reverb and the higher powered amps.Ĭhannel Reverb Mod The preferred way to apply reverb and tremolo to both channels and There's alsoĮnough room for the addition of a nice little 6" practice speaker. Reverb tank and power transformer to keep hum pickup to a minimum. If you are considering building an AB763 with reverb in a headĬab I recommend you go no smaller on the head cab dimensions than the silverįace Dual Showman Reverb head cab. Is also a great place to mod away with to make that channel interesting and
#TUBE AMP DOCTOR BIAS MASTER MODS#
Mods that keep the amp's original tone in place. The AB763 circuit is considered by most to be For information about theĪB763 model differences see this. Vibroverb, Tremolux and no-reverb Deluxe. The "763" in the model name comes from the circuit change dateĭeluxe Reverb, Twin Reverb, Super Reverb, Concert, Band-Master, Showman, Pro, Vibrolux, 'AB763' was Fender's internal model designation for the 1963Ĭircuit. Use just one hand when working on a powered amp. Lethal shock can run between your arms through your heart. Never touch theĪmplifier chassis with one hand while probing with the other hand because a High voltage then have an amp technician service your amp. If you have not been trained to work with Tube amplifier chassis contains lethal high voltage even when unplugged-sometimes Includes modifications for the 65 Deluxe Reverb Reissue and
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