Vox TB35C1 and TB35C2 "Tony Bruno Design" Amplifiers
A Look "Under the Hood"






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The Vox/Bruno TB35C1 and TB35C2 were introduced
in 2012. Let's take a look "under the hood" of these unconventional Vox amps.

Power Amp
The Vox TB35C1 and TB35C2 used four cathode biased 6V6 tubes (V6 through V9 in illustration above) in its power amp section. The Vox/Bruno series were the first Vox amps to utilize this traditionally "US" output tube.

Preamp and Tone Control Circuits
One half of the first 12AX7 preamp tube, V1, was used as the first gain stage. Its output was directed to the tone stack. The second
half of V1 was used as a predriver for the reverb circuit. V2 was also a 12AX7. One half of V2 was used for gain recovery from the tone stack, the second half of V2 powered the foot switchable "Macho" circuit. The "Macho" circuit boosted both gain and mid response. V3 was a 12AT7. Both sides of V3 were used in conjunction with the reverb driver transformer to power the reverb send signal. V4 is again a 12AX7 tube. One half of the tube was used for the reverb return circuit. The second half of V4 was unused. V5 was yet another 12AX7. It served as the phase splitter for the "push-pull" output amplifier circuit.

Reverb Pan
The TB35C1 and TB35C2 used a 9 1/4" long, three spring reverb pan with a long delay. The input side was 8 ohms, the output transducer was 2575 ohms.



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