Looks like my problem is solved. Seems like one of the tubes (ECC83-S) is damaged. I've replaced it with one of the old 12AX7 and problem disappeared.
Thank you for help
Search found 3 matches
- Fri Mar 07, 2014 1:09 am
- Forum: Fender Discussion
- Topic: Fender Hot Rod Deluxe - problem after tubes replacement
- Replies: 7
- Views: 3459
- Mon Mar 03, 2014 3:37 pm
- Forum: Fender Discussion
- Topic: Fender Hot Rod Deluxe - problem after tubes replacement
- Replies: 7
- Views: 3459
Re: Fender Hot Rod Deluxe - problem after tubes replacement
If you look at the schematic, the HRDX has the cathodes for the power tubes tied together and there is one bias test point that is the sum of the current for both tubes. Exactly, 70mV is a sum for both power tubes. Does the problem go away if you put 12AX7 tubes in the preamp? The only tube substit...
- Sun Mar 02, 2014 8:23 pm
- Forum: Fender Discussion
- Topic: Fender Hot Rod Deluxe - problem after tubes replacement
- Replies: 7
- Views: 3459
Fender Hot Rod Deluxe - problem after tubes replacement
Hi all! I'm an (not very happy) owner of Fender HRDx. Few days ago I've replaced stock tubes with JJ's. I've found interesting post about replacing 12ax7's with something different and decided to give it a try. Power tubes are 6L6-GC (biased around 70-71mV), preamp: v1 - ECC81 (12AT7) v2 - ECC832 (1...