I hope I made sense and that I didn’t forget any important details. Secure the board with a couple of screws for testing and if it works put everything back together and enjoy the amp. The NT2H provides a headphone/line out jack with on-board speaker. Solder them to the bottom of the board in the two positions where the originals were attached. Vox is a musical equipment manufacturer founded in 1957 by Thomas Walter Jennings in. I didn’t try this but it looks like it should work fine.īoth leads in the MM choke are black and I understand that it makes no difference which one goes where. Attach the choke with the bottom screw first and bolt the top to one of those holes. A possible solution to avoid this would be using one of the ventilation holes already in the chassis.
Attach the black wire to the ground screw and tighten it.ĩ) The choke will need an extra hole drilled to the chassis. Leave that alone for now, it should be the final step after testing that everything works as intended.ħ) Send the yellow and white/yellow leads underneath the turret board and attach them to the tube sockets as follows (see left picture).Ĩ ) Solder the thick yellow 16 ohm lead to the top position on the impedance switch and the thin green 8 ohm lead to the bottom. The picture shows the bundled cables secured to the chassis with nylon ties. Solder it to the same turret that the old red lead was attached to in step 1). No idea what’s the best solution for this situation but this worked out for me (see left pictures).Ħ) Bundle the primary leads (red, yellow and white/yellow) and pass the red one underneath the board like in the picture (see left picture). Unscrew the black cable from the ground connection (see picture on the right).ĥ) Remove the OT and attach the new one. Remove the choke.ģ) Unsolder the brown and white leads coming from the stock OT to the tube sockets (see left picture).Ĥ) Unsolder the blue and green leads attached to the impedance selector on the back of the amp. The red one in the pict comes from the primary side of the OT and the black and white from the choke. The OT has six leads that need to be unsoldered to remove the existing transformer. Take out all the screws of the turret board and lift it till you find the three cables in the picture. This is the process I used to replace the OT and Choke:ġ) Remove the back cover and bottom of the chassis.Ģ ) Cut the nylon ties that secure the primary leads to the chassis. The original thread also deals with upgrading the filter caps and can be found here. Posting in the hope this helps someone out in the future.Thanks to mAx_ at the Vintage Amps Forum for sharing know-how and experience on upgrading the output transformer and choke on the AC30HW. Notice that CON5 ribbon was half out its slot. Inspect board + components for obvious signs of a problem. Tested by noodling around with a chopstick when its on and/or visual inspection. Most commonly they are found on the tube sockets (underneath) as the soldering on those was never good apparently. Its basically just an RCA jack x 2 soldered directly to the board.
Tested by swapping them out one by one with a spare tube.
VOX AC30CC2 CUTTING OUT PATCH
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