|
09-09-2009, 08:44 AM
| #1 |
| Junior Member Join Date: May 2008
Posts: 19
| 5u4 rattles on powerup
Hello all. I am new to amp building and have been able to avoid major failure for 3 builds now. I have noticed in my 5E7 that the JJ 5U4 starts to rattle when the mains are applied (325-0-325). This is not reproduced in the audio circuitry to any effect, but it keeps rattling as long as it's on. It does not matter if the standby is on or off. The B+ is ~ 410 (pretty close to spec.) I would like to know: - Is this normal? - Does anyone used anode resistors on a rectifier tube and would this help? The amp sounds pretty good, but there is always room for improvement. |
|  |
| ...and now, a word from our sponsor: |
| |
|
09-09-2009, 10:46 AM
| #2 |
| Supporting Member Join Date: Feb 2007 Location: Wellington NZ
Posts: 2,351
|
Try a different 5U4G in there. It is not usual for a rectifier to rattle
__________________ Building a better world (one tube amp at a time) |
|
| |
|
09-09-2009, 07:50 PM
| #3 |
| Junior Member Join Date: May 2008
Posts: 19
|
Darn. Thats the second straight JJ 5U4 that's defective then. The last one was chalky with a hairline crack near the base. Back to the copper cap...
|
|
| |
|
09-19-2009, 10:00 AM
| #4 |
| Senior Member Join Date: Jun 2008
Posts: 190
|
You may want to check the health of your first power supply cap. If its leakey it could cause excessive loading and the rattling you are talking about
|
|
| |
 |
| Bookmarks |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | |
| Display Modes | |
| |
| ||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Bridge rectifier & arcing 5u4 | 6267 | Theory & Design | 3 | 03-23-2009 11:40 PM |
| Reducing vibrations & rattles - seeking ideas on cab design | tubeswell | Cabinetry | 6 | 06-16-2008 01:01 PM |
| Deluxe Reverb 5U4 problem | legaskins | Maintenance, Troubleshooting & Repair | 1 | 10-08-2007 02:45 AM |
| Is it ok to use a 5U4 instead of a GZ34 in a Vibrolux? | Humbucker | Maintenance, Troubleshooting & Repair | 15 | 04-14-2007 12:45 AM |
| 5U4 or GZ34 in 1970 Super Reverb (460V vs. 495V) | Iplayloud | Maintenance, Troubleshooting & Repair | 5 | 07-24-2006 05:03 AM |
Linear Mode
