![]() Secondly, the AC-30/6 circuitry did not include the troublesome EF-86 tube. Having three channels with individual volume controls, the AC-30/6 offered the ability for three instrumentalists to play through the amp simultaneously. First, it was not unusual for an English band to pool their money to buy one good guitar amplifier and share it. A number of reasons have been offered for this decision. Vox decided to retire the AC-30/4 by the middle of 1961 but the AC-30/6 was retained. The AC-30/4 and the AC-30/6 were simultaneously available from Vox in late 1960 and early 1961. The AC-30/6 replaced the troublesome EF86 based preamp circuit from the AC-15 and AC-30/4 with a new design based on ECC83 (12AX7) tubes. Unlike the two channel, four input AC-30/4, the AC-30/6 was a new and unique design by lead Vox engineer Dick Denney that had three channels and six inputs. Like the AC-30/4, the AC-30/6 was a 2x12" 30 watt combo amp. Vox introduced the AC-30/6 in the second half of 1960. ![]() Howling and ringing tones from the failing EF86 tube would at times accompany the tone of the guitar playing through the amp. As the EF86 started to deteriorate, it often would became microphonic. In the AC-30/4, the strong vibrations caused by a 30 watt power amp powering two 12" speakers was often more than the EF86 could tolerate. At the lower output level of the 17 watt AC-15, this was not a large issue. The EF86 tube used in the AC-30/4 preamp circuit (photo at left) proved to be susceptible to damage from excessive vibration. ![]() S hortly after the AC30/4 amp was introduced, an unforeseen engineering problem arose. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |