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The Tube Tweak GUI One of the most powerful features of ReValver MK III.V is the detail and number of parameters that can be used to fine tune any tube circuit in a module. In the module’s Tweak GUI, click on a tube icon to bring up the tube Tweak GUI. 44
On the tube Tweak GUI, the editable parameters are divided into two groups, the Physical and the Non- Physical (which has no mean ing in reality but can be used to enhance the sonic properties). Depending on which tube you wish to tweak, you can choose between triodes or pentodes. A power pentode is a tube type often used to drive the speakers, therefore you will usually find them as the last tube(s) in the chain of any amplifier. Triodes are voltage (V) amplifiers, whereas power pentodes (combined with a transformer) in ReValver MK III.V are treated as current (I) generators. You can replace any tube in the module with another tube of the same general type, from a stock of templates. The internal parameters of a tube consist of features like amplifica tion, linearity and driving strength. These parameters cannot be changed and are not displayed on the GUI. If you check the option Only Load Internals, only these parameters will be loaded, otherwise the entire GUI will be reset. The Character parameter can be used to shape the frequencies of the distorted component. (On low input, the Character has minimal impact on the sound.) If you are editing a pentode you have the option of configuring it as a single-ended amplifier or as a pushpull amp. One push-pull tube is actually an even-number 2 or 4, but as the parameters are identical for all, only one tube icon is displayed on the Tweak GUI. A tri ode can only be configured as a plate follower (a cathodebiased voltage gain stage). VPP is the power supply voltage delivered to the tube stage from the power supply. Usually, the VPP is slightly lower if the stage is located early in the signal chain. In case the power supply is “sag ging” (usually due to heavy load and high volumes), the VPP becomes temporarily lower, but the amount depends on internal values in each ReValver MK III.V amp module. Plate load (triode) and transformer impedance (pentode) are the parameters over which the signal is generated. The value of the load affects the signal output strength. Also, the transfer characteristics of the load changes the voltage on, and current through, the tube itself. Attenuation is not directly a part of the tube stage but can be thought of as a generic way of decreasing (attenuating) the signal after amplification. Cathode resistor (where applicable) is a resistor which is used to bias the tube, or in other words balance the symmetry of the waveform. It is commonly set near 1.5 kOhms for triodes, but the actual setting depends on the desired sound. The setting will also affect the overall gain in an “unbypassed” stage. (See definition of “unbypassed” below.) Cathode capacitor (where applicable) is connected in parallel with the cathode resistor. It has two main effects on sound: 1) The capacitor enables the stage to amplify the signal more; and 2) It will act as a low-shelf filter, effectively cutting out some low bass. The cutoff frequency is equal to 1/(6.28*RC), with C as the capacitor value and R as the value of the cathode resistor. This in turn affects the distortion spectrum. With a cathode capacitor, the stage is called bypassed, and without, unbypassed. 45
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