The 12″s are fuller, warmer, looser in the low end while having more mids and a more three. 10″s provide a more scooped, responsive, punchy and sparkling sound than 12 inch speakers. The Vibrolux is quite similar to the Pro Reverb 2×12″ except for the smaller speakers, output transformer and power transformer. Driving 10 watts of handwired Tweed tone into an 8 ohm Jensen P10R AlNiCo speaker, the Achillies Vibrolux Replica delivers that sought after lush vintage tremolo (variable Speed and Depth knobs) and signature 5F11 drive tone that retains elements of clarity and tightness even when pushing the 12AX7. 1956-1960 were the golden years for this smaller member of the Tweed family, the Vibrolux/5F11. The article mentioned that the ‘benefits’ of this cathode coupled output stage were Improved low frequency response. ![]() However, when I actually built the circuit, the output was very clean and about 21/2 watts. The output transformer recommended was a 5K primary unit, a standard value.
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