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Trimax Amplifiers

Trimax Type 1 Power Converter

Output 250V DC @ 60mA and 6.3V @ 2.5A

Trimax Type 1 Amplifier

PMG / ABC Specification Type 1 Amp

40dB pre-amplifier, input impedance 50 or 600 ohms, +21dBm output @ 1% distortion into 600 ohms, Valve complement 1 x EF86 and 1 x 12AT7.

Trimax Type 2 Amplifier

PMG / ABC Specification Type 2 Amp

0-6.5dB pre-amplifier, adjustable in 0.5dB steps, Input impedance 25,000 ohms, +27dBm output @ 0.5% distortion into 600 ohms, Valve complement 2 x 6AM5.

Trimax Type 3 Amplifier (Model A54)

PMG / ABC Specification Type 3 Amp

42dB Power amplifier, continuously adjustable, Input impedance 25,000 ohms, 12W output @ 0.25% distortion into 12 or 3 ohms, 20W output @ 1% distortion, Valve complement 1 x 6AU6, 1 x 12AT7, 2 x EL34, 1 x 5V4G.

Trimax Type 3 Amplifier (Model A54A)

PMG / ABC Specification Type 3 Amp

42dB Power amplifier, continuously adjustable, Input impedance 25,000 ohms, 12W output @ 0.25% distortion into 12 or 3 ohms, 20W output @ 1% distortion, Valve complement 1 x 6AU6, 1 x 12AT7, 2 x EL34.

Type 3 Amplifier "under the hood".

The main difference between the A54 and A54A versions of the Type 3 amplifier is that the A54A uses a solid state rectifier in stead of a valve rectifier. The A54B featured in the Trimax brochure is the model that was being sold by 1964. As I don't have an example of the A54B in my collection I'm not sure what the differences are if any to the A54A.