Care and Feeding:
While we hope you get years of worry free use out of your Dr Z Amp there are some basic
maintenance procedures to follow.
Changing Output Tubes: If your amp starts sounding a bit dull or lacks punch it’s usually
time for a new set of output tubes. Changing the EL84 output tubes on your Carmen Ghia is
easy. This amp is cathode (self) biased so there is no need to rebias when changing tubes.
Always use a matched pair of EL84’s. We use Groove Tubes EL84S as our standard EL84.
Always make sure the power is off and AC cord is unplugged when changing tubes. Always
use caution not to burn your fingers as tubes become very hot quickly. With moderate usage
output tubes should last 6 months to a year.
Changing Pre Amp Tubes: When pre amp tubes fail it usually results in a static type noise or
a ringing microphonic type sound. Pre amp tubes are easily replaced. We recommend re-
placing them with the same brand/type that came in the amp. We have hand selected these
tubes to deliver optimal voicing.
Changing Rectifier Tube: Signs your rectifier tube (5Y3) needs changed are fairly obvious.
A bad rectifier will usually result in a fuse blowing. Power off, unplug the AC cord and re-
place the blown fuse before replacing the rectifier tube. Use caution as these tubes get very
hot!
General Maintenance:
•
If you experience intermittent crackle/static type sounds make sure the 4 screws that
secure the chassis are tight. If a bit loose, the chassis will lose connection to the RF
shield.
•
Make sure a speaker is connected to your amplifier before you turn it on. Always
match your speaker or cabinet to the proper ohm rating on the rear of the amp (8 ohm
speaker or cab into the 8 ohm jack.)
•
If amplifier powers on, but no sound is heard after switching off Standby check your
½ amp fuse on the rear panel ( for related troubleshooting see changing rectifier tube
above.) If problem persists contact your dealer or Dr Z Amps.
•
Do not set liquids on top of your amplifier.
•
Becuase tubes are made of glass be sure to allow you amplifier time to acclimate to
drastic changes in temperature before powering on.
www.drzamps.com
Summary of Contents for Carmen Ghia
Page 1: ...Carmen Ghia Owners Manual ...
