The total cathode current is 75mA + 15mA = 90mA.Īccording to Ohm's Law, this creates a voltage drop across a 270Ω
Push pull output transformer design tv#
New! Guitar Amplifier Electronics: Fender Deluxe - from TV front to narrow panel to brownface to blackface Reverbīad Cat measures a voltage drop of 15V across each 1kΩ screen resistor.Īccording to Ohm's Law, the idle screen current is With 70 percent being a widely followed rule of thumb. Which enables it to get the most power from a Class A design.Ĭlass AB designs are typically biased at less than 85 percent,
The key takeaway is Hot Cat's hot bias, approximately 100-percent plate dissipation, This is only slightly higher than the 25W limit for an E元4. The plate-to-cathode voltage is 376V - 24V = 352V. The Y axis indicates that the DC plate current is 75mA per tube. Intersects the vertical line for a -24V grid at the red dot shown here. With a 367V screen and a 24V cathode, the screen-to-cathode voltage is 343V.Īn imagined 343V curve on the E元4 plate transfer characteristics There is no negative feedback from the output transformer secondary. The Hot Cat design is cathode biased with a separate cathode resistor for each Lightning, respectively, in almost every way - other than their use of aįew modifications that Sampson might have liked to bring to the Matchless Models such as the Black Cat and Cub looked extremely like the DC30 and Sampson had just left Matchless at the time, was able to come on as Bad Cat'sĬhief designer, and there we have it: no mere coincidence that cornerstone "Keen to build high-quality amps in the vein nominally referred to as 'Class A,' founder James Heidrich did his due diligence before starting up the companyĪnd, as he told me in the early 2000s, 'All roads seemed to lead to Mark The Bad Cat Hot Cat 30 has an E元4 push-pull power amp biased for Class A operation, a rarity for guitar amps.
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