Post by Jaguarguy (Mike) on Mar 3, 2015 20:52:02 GMT -7
Not much tone-wise. I don't think the average person could really hear much difference. I have 6545 - used to have KT45 but sold it since it was so close to 6545 but not nearly as versatile an amp as 6545.
Post by Mark (Basement Enthusiast) on Mar 4, 2015 11:31:07 GMT -7
If I recall correctly, the standard SRZ-65 is tube-rectified, and the KT-45 uses a solid-state rectifier (can still use a tube, though, if desired?). Depending upon how the power is rectified in the 6545, this may be the only difference between its "45" side and the standard KT-45.
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Post by Phil (aka Phil) on Mar 23, 2015 4:42:54 GMT -7
I've got a KT45 sporting a SS rectifier, a SRZ 65 LE and a 6545. The 65 and 45 on the 6545 could not be more different than the individual amps. Part of it (maybe a lot of it) come down to tube differences but when I say they're different I mean REALLY different. The 65 side of the 6545 is mellower and creamier than the buzzsaw JCM800 sound of my SRZ LE...and the LE is sporting KT77's, not known to be a bright tube. The LE has seen many different types of output tubes from Mullards to GT's to Siemens to the KT77's and its basic high-gain "I want to take your head off" character is consistent.
The 45 side of the 6545 is also much more mellow and not as loud as the stand-alone KT, which is much brighter and harder. Even when I sub in a tube recto and adjust the bias of the KT it's still louder and brighter than the 45. I kind of suspect the voltages are lower in the 6545 but I have not taken my voltmeter to it.
Even preamp tube swaps have not made the 6545 sound exactly like its counterparts.
Given my personal choice I'd take my stand-alone KT45 and the 65 side of the 6545. The LE is great for hard rock but it's missing that "something" that the 65 side of the 6545 has.
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