Hi Guys I've got a 6545 but since it's discontinued, I don't think that forum gets read much.... Here's my question: mine is not near as loud as either my Remedy or my Maz Sr- both of which are lower wattage amps?! I'm wondering if something is wrong with it- and how to find out. Yesterday it made a screeching noise and then blew the fuse...past experience told me good chance it was a bad rectifier tube. So I replaced that and put new power tubes in...and it works-fuse didn't blow...but it doesn't seem to have the power that it used to have. Shouldn't this amp be very loud on the KT45 side--and really scream on the SRZ 65 side?? Any thoughts?? Thanks, Dickie
Hi Dickie. New owner of a (used) 6545 here also. I need to replace the power tubes, but even without doing that the amp is pretty loud on both sides. I'm not sure if the output power of the 6545 matches up to what individual KTs and SRZs put out; will have to do some research on that.
Unlike some of the Z amps, these amps have adjustable bias. Did you check and adjust the bias after putting new power tubes in? It is important to do that as it affects both sound and tube life. There are some threads here on how to do it. It's not hard to do but you need specific tools.
Added: according to Steve's (benttop) data sheets the 6545 is rated at 60 watts. However, a 60-watt amp will not be much louder than a 40-watt, played into the same speaker(s). There's not a linear or one-to-one relationship between output wattage and sound pressure level (volume).
Last Edit: Dec 31, 2011 7:01:47 GMT -7 by doctorice
Gear piled high. Talent? Must be hidden in there somewhere.
Post by Jaguarguy (Mike) on Dec 31, 2011 7:10:44 GMT -7
Hey Dickie - I find that my 6545 is not as loud as my SRZ 65. There is a good thread running in the ask the experts section about tubes for the 6545 started by Mike (Doctorice). Definitely worth a read.
Good advice above. I'd also compare the efficiency/sensitivity of the speakers in each amp. An inefficient speaker can dramatically lower the SPL on an otherwise identical amp. It would also drive the amp harder to reach the same SPL. Therefore the breakup point would come at a lower SPL.
Also, check the quality of your speaker cables. A really great speaker cable usually carries more power to the speaker (plus other benefits).
Last Edit: Sept 4, 2012 1:17:30 GMT -7 by eliot1025
THE STUFF I'M HAPPY WITH:
James Tyler SEHD
Allen Amplification Accomplice
Vovox, van den Hul and Sommer cables
Area 51 wah
Goodrich volume pedal
Tone Tubby ceramic 12"
mid 60's Gibson J-45
J Design cab