Bass Amps FAQ

1. What is a bass amp? 
2. Why can't I get any sound out of my amp? 
3. What could be wrong if my amp has No Power? 
4. What is a Thermal Circuit Breaker? 
5. Why does the circuit breaker in my amp keep blowing/popping? 
6. When should I reset the bias in my tube amp? 
7. What is the fuse value of my CARVIN amp? 
8. Where can I find the Original V3M manual? 
9. With all the power amp classifications, there may be terms you are unfamiliar with, so this document contains a brief description of Carvin's professional power amplifier designs and terminology. 
10. How should I box my amp to send it in for repair? 
11. What is the AC Cord wire gauge I should use with my amp? 
12. How to open the Guitar Tweed Case, or Black case. 
13. What does a bad tube look like? How do I know if my tubes are good or not? 
14. Does Carvin offer a trade in for the wireless that will not work after June, 2010 because of the frequency used? 
15. What is the availability of the AG100D Chassis replacement. 
16. What is the availability of the SX300 Chassis. 
17. What is the availability of the SX200 Chassis. 
18. Where can I find information on Old Carvin Equipment from the 60s, 70s, 80s. 
19. Where can I find the Return Form? 
20. Where can I find the Return for Repair Form? (RMA form) 
21. What is the Thiele? 
22. Can a Carvin Tech Modify my amps if I send them in? 
23. What is Moisture and Corrosion, and why is that bad? 
24. What do I do if I get Dust or Sand inside my gear? 
25. What do I do if my amp gets struck by Lightning? 
26. When I tap the top of my amp the signal goes in and out, what do I do? 



1. What is a bass amp? 
A bass amp is an amplifier designed for bass instruments to amplify low frequencies. 
Added: 8-2-2008 Revised: 11-10-2008 back to top 


2. Why can't I get any sound out of my amp? 
There are several conditions that must be met in order for the amplifier to function correctly. Verify that the speaker is plugged into the proper amplifier output (assuming the speaker is functional), the instrument is plugged into the input, the volume levels are up, and the mute is off. If you have no power, check your AC cable and fuse. 
Added: 9-11-2008 Revised: 11-10-2008 back to top 


3. What could be wrong if my amp has No Power? 
If the AC cord is not pushed in completely, then the amp will have intermittent power. Push firmly when attaching the cable making sure it is securely connected to the AC jack. The connection should not be loose. If you need a new AC Cord contact Carvin Service for a replacement. (800)854-2235 
Added: 9-11-2008 Revised: 11-10-2008 back to top 


4. What is a Thermal Circuit Breaker? 
A thermal circuit breaker works like a fuse, but can be reset. There is nothing to replace inside the thermal circuit breaker. Never try to pry it open. A white plastic tab will pop out when it exceeds its current limit, cutting AC power from the amplifier. To reset the circuit breaker, push the white tab back in. If you suspect you have a bad Thermal Circuit Breaker replace it. Never attempt to fix it!


Added: 9-11-2008 Revised: 11-10-2008 back to top 


5. Why does the circuit breaker in my amp keep blowing/popping? 
There are two major possibilities: 1. Something is bad inside the amp (a shorted component, for example) and it is drawing too much current. 2. The Thermal Circuit Breaker is bad. Never short the two leads that go into the Thermal Circuit Breaker to bypass it. 
Added: 9-11-2008 Revised: 11-10-2008 back to top 


6. When should I reset the bias in my tube amp? 
The Output stage of your tube amp should be biased every time the power tubes are changed and as the amp wears in. Only a certified technician should bias any tube amp. All tube amps require very high voltages that are dangerous when the circuit board is exposed. Do not attempt to bias your amp on your own if you are not familiar with the procedure. 
Added: 9-11-2008 Revised: 11-10-2008 back to top 


7. What is the fuse value of my CARVIN amp? 
To access fuse values, click here: Biasdoc. You can also find this information if you clik on "Troubleshooting", then "fuse and bias values" on the top menu and download a file with all of the fuse values. 
Added: 9-11-2008 Revised: 11-10-2008 back to top 


8. Where can I find the Original V3M manual? 
Attached is a link to the original V3M manual:
V3M manual
 
Added: 9-23-2011 back to top 


9. With all the power amp classifications, there may be terms you are unfamiliar with, so this document contains a brief description of Carvin's professional power amplifier designs and terminology. 



Click this link for a Description of the most common terms.
Carvin Professional Power Amp Design.PDF
 
Added: 1-26-2010 Revised: 1-27-2010 Generic FAQ back to top 


10. How should I box my amp to send it in for repair? 
The amp should be boxed up in its original packaging. If that is not possible, then box it up as best you can. Make sure to leave a protective cushion between the amp and the box. During shipping the amp will be exposed to rough handling. If improperly boxed, the unit will be damaged. Carvin is not responsible for shipping damage due to improper boxing. Remember to fill out your RMA form. 
Added: 10-21-2008 Revised: 11-10-2008 Generic FAQ back to top 


11. What is the AC Cord wire gauge I should use with my amp? 
Click on link,



AC Cord Wire Gauge.PDF
AC Cord Wire Gauge Rev B.PDF
AC Cord Wire Gauge Rev C.PDF
 
Added: 10-7-2008 Revised: 10-9-2013 Generic FAQ back to top 


12. How to open the Guitar Tweed Case, or Black case. 
Slide the lock (round circular part of the lock) to the left to open case. Like indicated in the picture, and the lever will pop out.

The case will not be locked, the key is inside the case. On the right hand lock slide to the right.

Click on link, to see video: How to open guitar case
 
Added: 11-10-2008 Revised: 10-30-2013 Generic FAQ back to top 


13. What does a bad tube look like? How do I know if my tubes are good or not? 



Look at this picture above, the two tubes on the left are bad. The two on the right are good. 

Note the red glow on the two tubes on the Left side. It's best to replace all 4 tubes when this happens, you will have to Bias the amp. We have instructions on how to Bias your amp, on the "How to Bias" tab.

If your amp is under warranty, call customer service at (800) 854-2235 for a new set.

 
Added: 12-5-2011 Generic FAQ back to top 


14. Does Carvin offer a trade in for the wireless that will not work after June, 2010 because of the frequency used? 
Carvin offers a 100 Dollar credit towards a replacement system, which are in the 638-698Mhz range(NEW), older is (700-800Mhz). You don't have to send in your old wireless. The credit applies to any owner not just the original owner. A serial number must be provided. Valid until Jan, 2013. Please call Carvin Sales at 800-854-2235 
Added: 2-8-2010 Revised: 2-8-2010 Generic FAQ back to top 


15. What is the availability of the AG100D Chassis replacement. 
AG100D Replacement Chassis:
Availability: Please call a head of time, before going to the Carvin Store to pick it up. Units upon request will be available on Thursdays if requested with sufficient time of notice.
Santa Ana Store: (714)558-0655 -1 week availability-
Hollywood Store: (323)851-4200 -1 week availability-
San Diego Store: (858)487-8700 -1 week availability-







Bring the original amp with you; you don't need to bring the cabinet. It is important that you call a head of time because the amp may not be in stock.

Installation Procedures:
Unplug the Speaker cabinet from the back of the amp. Unplug the power Cord from the Amp. Take out the 4 screws on the top, and then slide the amp out through the front of the cabinet. Reverse for installation. 

Carvin Service - 1(800) 854 2235
 
Added: 5-20-2013 Revised: 5-20-2013 Generic FAQ back to top 


16. What is the availability of the SX300 Chassis. 
SX300 Replacement Chassis:
Availability: Please call a head of time, before going to the Carvin Store to pick it up. Units upon request will be available on Thursdays if requested with sufficient time of notice.
Santa Ana Store: (714)558-0655 - 1 Week Availability -
Hollywood Store: (323)851-4200 - 1 Week Availability -
San Diego Store: (858)487-8700 - 1 Week Availability -







Bring the original amp with you; you don't need to bring the cabinet. It is important that you call a head of time because the amp may not be in stock.

Installation Procedures:
Unplug the Speaker cabinet from the back of the amp. Unplug the power Cord from the Amp.

Take out the 4 screws on the back to remove the back cover. Then remove 6 screws on the top of the cabinet, then slide out the amp, through the back of the cabinet. Reverse for installation. 

Carvin Service 1(800) 854-2235
 
Added: 5-20-2013 Revised: 5-20-2013 Generic FAQ back to top 


17. What is the availability of the SX200 Chassis. 
SX200 Replacement Chassis:
Availability: Please call a head of time, before going to the Carvin Store to pick it up. Units upon request will be available on Thursdays if requested with sufficient time of notice.
Santa Ana Store: (714)558-0655 - 1 Week Availability -
Hollywood Store: (323)851-4200 - 1 Week Availability -
San Diego Store: (858)487-8700 - 1 Week Availability -







Bring the original amp with you; you don't need to bring the cabinet. It is important that you call a head of time because the amp may not be in stock.

Installation Procedures:
Unplug the Speaker cabinet from the back of the amp. Unplug the power Cord from the Amp.

Take out the 4 screws on the back to remove the back cover. Then remove 6 screws on the top of the cabinet, then slide out the amp, through the back of the cabinet. Reverse for installation. 

Carvin Service 1(800) 854-2235
 
Added: 5-20-2013 Revised: 5-20-2013 Generic FAQ back to top 


18. Where can I find information on Old Carvin Equipment from the 60s, 70s, 80s. 
Try CarvinMuseum.com we have a lot of manuals and schematics from the early years.

CarvinMuseum.com
 
Added: 7-13-2012 Generic FAQ back to top 


19. Where can I find the Return Form? 
Click the link below to download the file.

RETURN FORM 

For any "return" questions please call 1-800-854-2235

 
Added: 8-18-2011 Revised: 10-3-2011 Generic FAQ back to top 


20. Where can I find the Return for Repair Form? (RMA form) 
The form can be located at the link below:

Return for Repair form RMA
 
Added: 8-18-2011 Generic FAQ back to top 


21. What is the Thiele? 
The Thiele specifications are a set of parameters used to describe the audio characteristics of a speaker driver. 
Added: 8-26-2009 Generic FAQ back to top 


22. Can a Carvin Tech Modify my amps if I send them in? 
No. Carvin Technicians are not permitted to MOD (modify) any amplifier. It is against company policy. Carvin does not repair modified amplifiers. If a modification is found during a repair, then the component values will be returned to factory specs (if it is not rejected). 
Added: 9-11-2008 Revised: 11-10-2008 Generic FAQ back to top 


23. What is Moisture and Corrosion, and why is that bad? 
Moisture is the presence of water in trace amounts. It can cause rot in wood and corrosion in metals, both of which are the main materials in your amplifier and cabinet. When moisture goes inside the amp it can corrode the input and output jacks (causing intermittent crackling, popping, and volume loss), damage the cables inside the amp, and short traces on the circuit boards. If corrosion is present on any of the jacks, the best thing to do is to replace them. For light corrosion, applying contact cleaner to the jacks will help. 
Added: 9-11-2008 Revised: 11-10-2008 Generic FAQ back to top 


24. What do I do if I get Dust or Sand inside my gear? 
Dust and/or sand should never go inside the amp. If any debris goes inside try to clean it out as best you can. Dust and sand can block the fan and vents, causing the amp to overheat, and they can also short components inside. Any debris inside the chassis will also absorb moisture and cause corrosion to form on chassis and circuitry. 
Added: 9-11-2008 Revised: 11-10-2008 Generic FAQ back to top 


25. What do I do if my amp gets struck by Lightning? 
Lightning can cause extreme and intermittent failures to all electrical equipment. Most of these issues are very difficult to repair and usually return after time. In the case of a direct hit, the amp will likely not work well ever again. If there was a black out for a few seconds and the amp does not power back ON, check the fuse. For a replacement fuse click on "Fuse and Bias Values" in the FAQ Categories menu. 
Added: 9-11-2008 Revised: 11-10-2008 Generic FAQ back to top 


26. When I tap the top of my amp the signal goes in and out, what do I do? 
This is a characteristic of something inside the amp being loose. In most cases it is a loose connector, but it can also be dirty or corroded contacts, a bad ribbon cable, or broken solder joints. To check this, take the amp out of the enclosure and verify that all harnesses and connectors are installed correctly. Disconnect and reconnect the ribbon cables. Power on your amp and verify that it is working properly. If the problem persists, you may have to replace a connector and do further troubleshooting. A cable can work its way out from the vibration of a speaker. For a replacement cable click on "Parts". 
Added: 9-11-2008 Revised: 11-10-2008 Generic FAQ back to top