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Post subject: Blues Deluxe Reissue intermittent problems
Posted: Sat Aug 11, 2018 2:07 pm
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Joined: Sat Aug 11, 2018 1:28 pm
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BDR with PCBs silk screen printed 2009. Is there a later schematic than 2004?
This is a nearly new unit which has several issues, that should not occur in an amplifier which has had so little use. It has disappointed it’s owner who is life long guitarist, and user of Fender equipment.
1. Intermittent switch on extension loudspeaker jack leading to loss of connection to the internal speaker, because the output goes through the impedance switch on the extension speaker jack socket.
2. Bass resonance (about 60Hz) from cabinet feeding back into the Groove Tube 6L6GC-R output valve(s).
3. Heater circuit fuse (not shown on Rev A schematic) overheated at one end causing intermittent loss on indicator lamp and heater supply. Only finally detected when amp failed completely through the fuse nearly falling out of its holder. Fuse holder and fuse are mounted upside down on the output board completely hidden by the two heater connections from the transformer.

1. was easily resolved.
2. was resolved with a new matched pair of Harma 6L6GC-STR (from Watford Valves in the UK) This manufacture has a thicker glass that is less susceptible to microphone. WV claim these valves are more suited to Fender amps.
3. will require removal of output board and repositioning of the fuseholder and fuse to a position where it is visible(!!), can be easily changed, and is not upside down.
I’m posting this for the benefit of the forum.


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