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I have a rack tuner, should this be connected to the Effects Loop?
Yes.  Bear in mind that this won't allow for muting options, if that is part of your tuner's options.
I have a "stomp box" effects unit, should I connect it to the Effects Loop?
No, pedal effect units should go inline, meaning directly into the front end of the amp.
How should I connect my speaker cabinet(s) to my Hartke 3500, "daisy-chain"? From output to cabinet?
Both options yield the same result as the speaker output jacks are wired in parallel.
Which cabinets do you recommend for use with the Hartke 3500?
Remember that the minimum impedance is 4 ohms, so you can either connect two 8 ohm cabinets or one 4 ohm cabinet.  The 410XL is a perfect match.
How do I order replacement speakers for my Hartke Cabinet/Combo?
Please contact Customer Service at 1-800-372-6766 (Mon-Fri 9am to 5pm  Eastern) to place your parts order.
Where can I get my Hartke product serviced?
Check the link on our website, there might be an Authorized Service center around the corner.
How do I register my warranty?
You can fill out the warranty card and mail, or follow the link on our website.
Can I add an extension cabinet to my Hartke Combo Amp?
That will depend on the model.  The only combo that can power an extension is the 5210. 
How can I determine my Hartke's date of manufacture?
The number before the letter indicates year of production.  5500 - 5H9C00012 = 2009 PRODUCTION. (5H = Model 5500 - 9 year - C = 3rd month (A=January, B=February, etc.)
I hear distortion from my cabinet, how do I remedy this issue?
First test the battery in your bass if it is active, and swap cables.  Please contact Customer Service at 1-800-372-6766 if the problem persists.
What kind of rack case can I mount my Hartke amp in?
Our amps, with the exception of the Kilo, are 2 rack spaces.  Any 2 Unit rack case will be satisfactory.
Is the LH Series XLR Direct output pre or post EQ?
The LH direct output is pre EQ.
What kind of tube is in my Hartke amplifier?
Hartke 2000, 3000, 3500, 4000, 5000, 5500, 7000, LH500, and LH1000 use a 12AX7 preamp tube.
Can I have my Hartke speaker reconed?
We no longer offer recone kits.  You can order replacement speakers by contacting Customer Service at 1-800-372-6766.
My Hartke 2500 has extra switches, what are they for?
XLR direct out - top switch is for Ground Lift (in lifted, out normal) - bottom switch is Pre/Post EQ (in is post-eq, out is pre-eq).
Can I get a Hartke cabinet built to be 4 ohms?
We do not offer "custom shop" cabinets.
My new 3500 isn't as loud as the one I owned prior, what could be wrong?
The 3500 has been in production for 20 years, and has undergone a great many changes.  Please call Customer Service at 1-800-372-6766 for info.
When should my amp's cooling fan start spinning?
Most current revisions include at thermally controlled fan, meaning it spins as the amp heats up.
How do I change the voltage on my Hartke amp?
The HA amplifiers are voltage selectable. The fuse sled is located above the AC inlet. Remove the sled and switch the voltage selector.
Are Hartke's power ratings Peak or RMS?
Hartke rates their speaker cabinets RMS.