It is a commonly held observation that a closed back cab is punchier with a tighter bass response, while being more directional, for example louder in front, less to the sides and even less behind. I am not sure a ten inch openback is ideal as far as bass tones are concerned but the 12 will make up for that. I prefer an open back combo, it spreads the sound around. Putting in a 12 inch, which will push more air around will probably react a lot differently in there, probably not in a good way. Vox likely designed the closed system around the speaker, with a vent at the top and a small slot in the bottom rear. There’s a few things that drive the open back option for me. Maybe dig up a Vox emblem to finish the look which my MS paint version does not have. You could use mdf or pine from Home Depot, spray the front black, and then use Vox cloth for the whole front. (If someone wants to measure that would be great but you would be need to remove all the cloth and tolex to cut the new hole which would not be fun. Given the cabinet dimensions width wise it should be possible to move the transformers further to the side and relocate the tubes so allow for the depth of a 12 inch.ġ) cut power tube mounting tab with a dremel but leave the 90 degree flangeĢ) turn the power tubes 90 degrees and mount to the edge of the metal panel (might be needed for grounding)ģ) move both transformer up and to the side while still mounting to the metal panel for grounding (this would be a good time to make sure a 90 degree turn of either transformer wouldn't help with hum)Ĥ) While you could likely reuse the cloth and tolex of the original the leather upper would likely obscure the upper part of a 12 inch cone so a new baffle would need to be made. The screws for the transformers are not visible from the outside which is great. The question I need answered before moving forward is what is the depth from the back of the speak baffle to the back of the MDF back panel? So as you can see the tubes are mounted on a cut piece of the metal mounting board which is then mounted to the back panel via screws.
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