The tube should light up when the amplifier is turned on. If the tube has a white substance coating on the inside at the top of the tube, then it has lost its vacuum and should be replaced.
Chassis screws can loosen over time. Check to make sure all screws are tight. Tubes can also develop rattle over time due to heat and mechanical wear and tear.
The effects loop in the Blues King 12 and Keeley amplifiers is a passive design that does not pad or limit the amount of voltage present at the SEND jack. This approach retains 100% of the tube tone of the amp when the loop is not in use. Due to the large signal coming from the preamp, distortion can occur when the preamp volume is turned up to the point where it is outputting a signal larger than the effect is capable of handling.
Supro amps wired for 120V require a 3A fast blow fuse. Supro amps wired for 240V require a 1.5A fast blow fuse.
Contact your local electronics repair technician for tube amplifier service.
The fuse is located inside the IEC receptical.
Supro combos come with an 8-ohm speaker installed. Use an 8-ohm extension cabinet to achieve a 4-ohm overall load. Certain Supro models switch impedance automatically, while others require the user to manually swap the internal speaker over to the 4-ohm output jack. Check your amp’s user manual for reference.
Supro Blues King amplifiers are made in China. All other Supro tube amp models made between January of 2014 and July of 2020 were assembled in Port Jefferson, NY USA.
The original Saturn had a 5U4 tube rectifier, DT12 speaker and 6973 power tubes. The Saturn Mk II has a solid state rectifier, a BD12 speaker and 6V6 power tubes.
The original Thunderbolt came with a 5U4 tube rectifier and was hardwired at 35W Class A. The Thunderbolt+ came with the addition of a 3-way switch to select 35W class a (tube rectifier), 45W Class A (solid-state rectifier), 60W Class AB (solid-state rectifier). The Thunderbolt Mk II has a 2-way switch to select 35W Class A or 60W Class AB, both with solid-state rectifier.
No. If your amp did not come with a tube rectifier, then that open socket is not wired up.
The Supro product line has continued to evolve since the brand was initially reissued in 2014.
Yes. This work can be performed by an authorized Supro service technician.
We do not recommend any electrical modifications to Supro tube amps.
We do not recommend any electrical modifications to Supro tube amps.
We recommend using factory specified tube types only.
We recommend using factory specified tube types only.
Supro amplifiers are specifically designed to be used with factory specified tubes. We do not recommend using alternate tube types in Supro amps. Check your amp’s user manual for reference.
Bruce Zinky is not officially involved with Supro at this time.
Contact your local electronics repair technician for tube amplifier repairs and services.
Supro guitars are not in production at this time.
To view specs on discontinued models, please visit our Legacy Products section. Please email info@suprousa.com for any additional questions about Supro Guitars.
Hold the footswitch down when powering up to change the default status to OFF when powering up. You only need to do this one time. Perform the same action to switch the default status back to ON.
Supro pedals accept industry-standard expression pedals with TRS wiring. An Impedance rating somewhere between 10K-100K is ideal.
The Supro Delay can only run on 9VDC. Higher voltages will damage the pedal. All other Supro pedals can run on power supplies ranging from 9V-18V. More voltage will increase both headroom and output level.
The Supro Fuzz does not require a buffer.
