Vox JMI AC30/6 1963 very original condition
Incredible sounding and very original copper-top JMI Vox AC30 from late 1963. Case and chassis are in fantastic condition, and it has a pair of 1963 alnico blue speakers with orginal, Pulsonic cones, also in excellent condition. Original ‘egg’ footswitch is also included.
Vintage AC30s don’t get much better than this. Dating from the golden age of Vox JMI production, this sale consists of a late 1963 or early 1964 AC39 twin cab in black basketweave vinyl with original brown grille cloth. The case is complete with original vintage handles and vents and is in exceptional structural and cosmetic condition for its age. There is some damage to the vinyl, mainly on the base and lower back panel, and it has had a jack plate added to the upper panel which is currently empty and unconnected but could be used to add a jack for connecting to an attenuator (for example) without further modification. Overall, it is in remarkably good, clean shape.
The chassis is a Burndept-made example with original copper panel, original Woden transformers with green shrouds. These have dates from Sept and Oct 1963.
I have sympathetically restored and serviced this amp, replacing failed components only where necessary. The main filter caps have been replaced (they were failed, not just failing when I bought the amp!) All components of the power section, pre-amp and tremolo circuits have been painstakingly tested replacing - only where necessary - components that were significantly out of specification. Pots and switches are original and - following thorough cleaning and repair - operate cleanly and with no noise. The majority of the Wima Gold capacitors also tested good and have been retained. Failing electrolytics have been replaced with the best available modern equivalents, retaining their original values. The only modifications to the original specification are (1) the heater circuit grounding was improved (centre tap installed away from the Phase Inverter) which is a simple, common modification that significantly reduces mains hum and (2) the cathode resistor when I obtained the amp was the later 52ohm value that is famous for causing the amps to self-destruct. I chose to substitute the original-spec 82 ohm resistor that is less hard on the power valves and also sounds sweeter.
Both speakers have their original pulsonic cones whcih are undamaged. Neither exhibit any rubbing, lifting of the spider etc. and they test perfectly on a frequency sweep with my signal generator. More to the point, they sound amazing. These legendary speakers are over 60 years old, now, and so are increasingly difficult to find in this condition.
The amp will come with carefully chosen and curated valves including four matched vintage Mullard EL84 power valves (tested strong) and white-label Blackburn Mullard ECC83s (which test strong and sound fantastic). The ECC82 is a vintage GE CV491 tube.
All three channels work as expected and sound fantastic. The modulated tremolo channel on this example sounds particularly lovely. All the switches, pots and controls operate smoothly and work as expected. Note that the serial number incorrectly shows a ‘T’ for treble - this has always been a ‘Normal’ voiced chassis and it is fairly common for JMI to mis-apply the T and B suffixes to serial numbers.
Incredible sounding and very original copper-top JMI Vox AC30 from late 1963. Case and chassis are in fantastic condition, and it has a pair of 1963 alnico blue speakers with orginal, Pulsonic cones, also in excellent condition. Original ‘egg’ footswitch is also included.
Vintage AC30s don’t get much better than this. Dating from the golden age of Vox JMI production, this sale consists of a late 1963 or early 1964 AC39 twin cab in black basketweave vinyl with original brown grille cloth. The case is complete with original vintage handles and vents and is in exceptional structural and cosmetic condition for its age. There is some damage to the vinyl, mainly on the base and lower back panel, and it has had a jack plate added to the upper panel which is currently empty and unconnected but could be used to add a jack for connecting to an attenuator (for example) without further modification. Overall, it is in remarkably good, clean shape.
The chassis is a Burndept-made example with original copper panel, original Woden transformers with green shrouds. These have dates from Sept and Oct 1963.
I have sympathetically restored and serviced this amp, replacing failed components only where necessary. The main filter caps have been replaced (they were failed, not just failing when I bought the amp!) All components of the power section, pre-amp and tremolo circuits have been painstakingly tested replacing - only where necessary - components that were significantly out of specification. Pots and switches are original and - following thorough cleaning and repair - operate cleanly and with no noise. The majority of the Wima Gold capacitors also tested good and have been retained. Failing electrolytics have been replaced with the best available modern equivalents, retaining their original values. The only modifications to the original specification are (1) the heater circuit grounding was improved (centre tap installed away from the Phase Inverter) which is a simple, common modification that significantly reduces mains hum and (2) the cathode resistor when I obtained the amp was the later 52ohm value that is famous for causing the amps to self-destruct. I chose to substitute the original-spec 82 ohm resistor that is less hard on the power valves and also sounds sweeter.
Both speakers have their original pulsonic cones whcih are undamaged. Neither exhibit any rubbing, lifting of the spider etc. and they test perfectly on a frequency sweep with my signal generator. More to the point, they sound amazing. These legendary speakers are over 60 years old, now, and so are increasingly difficult to find in this condition.
The amp will come with carefully chosen and curated valves including four matched vintage Mullard EL84 power valves (tested strong) and white-label Blackburn Mullard ECC83s (which test strong and sound fantastic). The ECC82 is a vintage GE CV491 tube.
All three channels work as expected and sound fantastic. The modulated tremolo channel on this example sounds particularly lovely. All the switches, pots and controls operate smoothly and work as expected. Note that the serial number incorrectly shows a ‘T’ for treble - this has always been a ‘Normal’ voiced chassis and it is fairly common for JMI to mis-apply the T and B suffixes to serial numbers.
Incredible sounding and very original copper-top JMI Vox AC30 from late 1963. Case and chassis are in fantastic condition, and it has a pair of 1963 alnico blue speakers with orginal, Pulsonic cones, also in excellent condition. Original ‘egg’ footswitch is also included.
Vintage AC30s don’t get much better than this. Dating from the golden age of Vox JMI production, this sale consists of a late 1963 or early 1964 AC39 twin cab in black basketweave vinyl with original brown grille cloth. The case is complete with original vintage handles and vents and is in exceptional structural and cosmetic condition for its age. There is some damage to the vinyl, mainly on the base and lower back panel, and it has had a jack plate added to the upper panel which is currently empty and unconnected but could be used to add a jack for connecting to an attenuator (for example) without further modification. Overall, it is in remarkably good, clean shape.
The chassis is a Burndept-made example with original copper panel, original Woden transformers with green shrouds. These have dates from Sept and Oct 1963.
I have sympathetically restored and serviced this amp, replacing failed components only where necessary. The main filter caps have been replaced (they were failed, not just failing when I bought the amp!) All components of the power section, pre-amp and tremolo circuits have been painstakingly tested replacing - only where necessary - components that were significantly out of specification. Pots and switches are original and - following thorough cleaning and repair - operate cleanly and with no noise. The majority of the Wima Gold capacitors also tested good and have been retained. Failing electrolytics have been replaced with the best available modern equivalents, retaining their original values. The only modifications to the original specification are (1) the heater circuit grounding was improved (centre tap installed away from the Phase Inverter) which is a simple, common modification that significantly reduces mains hum and (2) the cathode resistor when I obtained the amp was the later 52ohm value that is famous for causing the amps to self-destruct. I chose to substitute the original-spec 82 ohm resistor that is less hard on the power valves and also sounds sweeter.
Both speakers have their original pulsonic cones whcih are undamaged. Neither exhibit any rubbing, lifting of the spider etc. and they test perfectly on a frequency sweep with my signal generator. More to the point, they sound amazing. These legendary speakers are over 60 years old, now, and so are increasingly difficult to find in this condition.
The amp will come with carefully chosen and curated valves including four matched vintage Mullard EL84 power valves (tested strong) and white-label Blackburn Mullard ECC83s (which test strong and sound fantastic). The ECC82 is a vintage GE CV491 tube.
All three channels work as expected and sound fantastic. The modulated tremolo channel on this example sounds particularly lovely. All the switches, pots and controls operate smoothly and work as expected. Note that the serial number incorrectly shows a ‘T’ for treble - this has always been a ‘Normal’ voiced chassis and it is fairly common for JMI to mis-apply the T and B suffixes to serial numbers.