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File Size: Kb Number of Views: After downloading, the file may take a moment to open in the browser. Fender – Bassman 5f6a -Schematic Thumbnail. The Bassman 5F6-A preamp contains two voltage amplifiers, one for the bright inputs and one for the Fender Bassman 5F6-A schematic of first two stages. 5F6A Amp Kit Item Code: 5f6a_c_kt We provide a layout and a schematic (on the Technical Details tab), but we do not include step by step assembly.

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The very nice custom lacquered tweed cab with 6″ baffle was made by John Mergili of www. Grid stoppers can help prevent blocking distortion and protect your power tubes from damage when driven hard into overdrive when grid current begins to flow.

Prowess Amplifiers – Fender – Schematics – Bassman 5f6a – Schematic

Only the bright channel is shown here. Since impedance affects an audio filter’s corner frequency we must use a much smaller coupling cap at the phase inverter grid to get the same low frequency roll off.

The unmodified channel needs a 1. A KL dual-gang master volume pot is added at top left. V1’s extra caps and resistors can get a little crowded on the circuit board so it’s a good idea to raise the hot cathode resistors higher off the circuit board than the coupling caps to aid cooling and minimize heat transfer from the resistors to the caps.

A solid state rectifier will only drop about 1. Scchematic a balanced bias control so you can separately bias each power tube.

Tighten up and modernize one channel’s clean and overdrive tone. The 5F6A draws 2.

Notes on the tweed Bassman schematic.

Many people put the bias pot in one of the unused speaker jack holes. Here is the tone stack response dB gain versus frequency in hertz with the middle control at percent rotation.


The glued down cap will provide enough support for the resistor and wire. I also suggest changing the Bright channel’s k mixing resistor to a k to help the V2A gain stage handle overdrive from the previous two gain stages.

Keep your tubes in their sweet spot. Since channel jumpering is so common among Fender players this mod will let you leave your jumper cable at home and jumper the Bright and Normal channels with the pull of the Normal volume knob. The feedback is negative because the plate is degrees out of phase with the grid. Since it must be 5d6a to the preamp side of the amp it will actually help balance the weight of the amp.

The original Fender schemayic schematic shows the power transformer as v so a lower HT output would be more authentic. LTP and cathodyne phase inverters present a very schemativ impedance to upstream circuits because their grid leak resistors are “bootstrapped” to the phase inverter tail resistor.

V1A’s bias point is shifted toward cutoff so the guitar schemayic negative lobe will get clipped at cutoff with a lower level input signal leading to earlier distortion onset. This diagram shows a 5E3 Deluxe but the push-pull switch wiring is the same. When the switch is in the left position the 2. This circuit is designed for use with bridge rectifiers with no center tap. The wire is usually located below the circuit board.

It’s a very accurate, efficient and loud speaker which makes it ideal for gigging.

These are some minor upgrade’s or tweaks I suggest for a 5F6A build. Consider using metal film resistors if you don’t care if the circuit board does not look period correct. Weber kits are sold only with the guarantee from the buyer, builder, and subsequent seller that no trademarked names or company schdmatic other than Weber or the builders name will be placed anywhere on the kit. You tap high voltage AC from the rectifier AC input and create an adjustable bias circuit.


If your 5F6A feedback is tapped off an 8 ohm speaker output like mine then your 5F6A feedback resistor should be 56k to give the same amount of feedback as the original 5F6A’s 2 ohm output with 5f66a 27k feedback resistor. You can do this with a schematc tube swap.

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The diode rectifies the 6. It works by mixing the two phase inverter output streams together and they cancel each other out. Since the lower grid is held constant at 0 volts AC, any change in its cathode voltage will create a voltage difference schematicc the grid and cathode. 5f6 users do not want the volume to drop when they roll off some bass. This kit must be shipped with signature required for delivery.

The mod is exactly the same in the 5F6A. The amp’s clean scematic overdrive tones are a little different in triode mode so this mod opens the amp’s tonal pallet. I also find myself using the raw tone stack cut switch quite a bit too. A ohm linear pot will work fine too. Both grid voltages are actually the same as the resistor intersection at This resistor cuts the total presence resistance in half to about 2.