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Read, retain, and follow all instructions. Heed all warnings.
Only use the recommended power supply for this unit. Only the 1Spot by Truetone 9VDC center negative
1700ma wall transformer has been tested with the Frog Tube Preamp Fx1.
WARNING: To prevent damage, fire or shock hazard, do not expose this unit to rain or moisture.
Unplug the power supply cord before cleaning the unit exterior (use dry cloth only). Keep ANY moisture way
from the Vacuum Tube or the Vacuum Tube socket hole!
During operation: Maintain at least 6 inches (15.25 cm) of unobstructed air space around the unit to allow for
proper ventilation and cooling of the unit.
This product should be located away from heat sources such as radiators, heat registers, or other products that
produce heat.
Protect the power supply cord from being pinched or abraded.
This product should be serviced by qualified service personnel when: the power supply plug has been damaged;
or objects have fallen, or liquid has been spilled onto the product; or the product has been exposed to rain; or
the product does not appear to operate normally or exhibits a marked change in performance; or the product
has been dropped, or the enclosure damaged.
CAUTION: No user serviceable parts inside, refer servicing to qualified personnel only. Contact
mark@frogpedals.com
Compliance Information for Frog Tube Preamp Fx1:
The equipment tested demonstrated compliance with Federal Communications Commission (FCC) Title 47CFR 15B,
CISPR 22 and 32, and Industry Canada ICES-003 requirements for Class B equipment.
Declaration of Conformity:
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause undesired operation.
Caution: Users that change or make modifications not expressly approved by the party responsible for compliance could
void the user's authority to operate the equipment.
Frog Fx1 Tube Preamp version 1.1
User Manual
Frog Tube Preamp Fx1
Important Safety
for any service issues.
Instructions
Page | 1
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Summary of Contents for Frog Fx1
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Page 1: User Manual
Only use the recommended power supply for this unit. Only the 1Spot by Truetone 9VDC center negative 1700ma wall transformer has been tested with the Frog Tube Preamp Fx1. WARNING: To prevent damage, fire or shock hazard, do not expose this unit to rain or moisture. - Page 2 Consult the dealer or an experienced radio/TV technician for help. Industry Canada compliance procedures the following applies: -CAN ICES-3(B) / NMB-3(B) Party responsible for compliance: Mark Price, mark@frogpedals.com , 816-392-9690, 26919 E Hunter Rd. Sibley, MO 64088, USA Frog Fx1 Tube Preamp version 1.1 Page | 2...
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Page 3: Power Requirements
Power requirements: The Frog Fx1 requires a 9 volt direct current (DC) power source with a minimum of 1000ma of loading capability or more. The power source must be center negative and will usually include a symbol on the device or packaging as follows: Reverse polarity protections are built-in to the Frog Fx1 so connection of a “center-positive”... - Page 4 Frogpedals.com warrants that the Frog Fx1 Tube Preamp product you have purchased shall be free of any defects in parts and workmanship if used under normal operating conditions for a period of three (3) years from the date of purchase, except vacuum tubes are warranted for a period of ninety (90) days from date of purchase (“Limited Warranty”).
- Page 5 9 volt DC power supply (center negative). Controls: Input: (right side) ¼ inch plug-in connection for your guitar or other compatible instrument Output: (left side) ¼ inch plug for cabling to other instrument effects and/or amplifiers Frog Fx1 Tube Preamp version 1.1 Page | 5...
- Page 6 Master Control: The Master control allows you to set the overall output volume once you have set the tone and drive controls. The Fx1 unit has a lot of output capability, so having the ability to tame the output volume is a handy feature.
- Page 7 These are modeled after the iconic Klon Centaur overdrive box and though the Klon is not a vacuum tube based effect, the clipping diodes in the Frog Fx1 have been placed in a similar portion of the circuit as compared to the Klon.
- Page 8 The original Alembic F2b, used a Fender style tonestack, but you can request a Marshall styled tonestack for your Frog Tube Preamp Fx1. You can see by the following illustrations, the vastly different settings required to get a “nearly” flat tone output. For bass guitar, the Fender tonestack has the most effective settings for the typical low tones of the bass guitar (unless you are Motorhead).
- Page 9 For Marshall style tone stacks, there are no real flat settings, as you know, Marshall is all about mids and highs! (as illustrated below) Settings (approx.) Bass at 4, Mid at 5, Treble at 1 Frog Fx1 Tube Preamp version 1.1 Page | 9...
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